home | other categories

current obsessions: olympus xa3 with neopan 1600

1600-speed (and such) film season is marching toward us. I've been having a great time with my Olympus XA2... [more]

* 21:13 * link · photos · comments (0)


I'm still alive, just trying to work out what to say. Mostly I've been taking lots of photos, lately.... [more]

* 18:17 * link · site news · comments (0)

from the sixteenth floor

I started a new group on flickr in case anybody else has photos of Housing Commission Flats around Melbourne... [more]

* 16:03 * link · photos · comments (0)

tomorrow night

The aforementioned exhibition - UNSENSORED09 - opens tomorrow night. Please come along! (yes, this means I can't go and see... [more]

* 12:41 * link · photos · comments (1)


I'm in an exhibition next month. Please come along!... [more]

* 08:56 * link · photos · comments (0)


I joined the Ektar craze and bought myself a pack of five rolls in 120 format to try out in... [more]

* 22:17 * link · photos · comments (0)

ICCD 2009

International Commie Camera Day 2009 seems to have been extended into the weekend, though I didn't manage to capitalize... [more]

* 19:05 * link · photos · comments (0)

no film today

I tried developing my first roll of 120 film from the Kiev 60, but accidentally opened the whole lid of... [more]

* 17:14 * link · photos · comments (0)


So, I've finally developed a roll of film at home. I need, um, a lot more more practice with... [more]

* 21:55 * link · photos · comments (1)

a pretty good friday

Easter's a good time for introspective walks on the quietest mornings you'll get all year - there are very few... [more]

* 20:21 * link · photos · comments (0)

with love

In case you hadn't noticed from my flickr stream lately, I'm completely in love with my Kiev 60 (or,... [more]

* 21:40 * link · photos · comments (0)

a bit of a grower

I took the Bessa out to the 2009 Flower and Garden show at the Exhibition Buildings and loaded a roll... [more]

* 21:04 * link · photos · comments (0)

kiev 60

Despite my recent protestations at the size of most medium format gear (I began to resent carrying a "camera... [more]

* 20:16 * link · photos · comments (0)


Here's the current collection, for what it's worth. One of them's completely stuffed (the weird-looking one the front), and... [more]

* 16:41 * link · photos · comments (0)


The New Year break is traditionally a good time for sysadmins to do all those server upgrades/reinstalls they couldn't quite... [more]

* 22:32 * link · photos · comments (0)

the other side of the world

I'm home, now. We flew into Vienna at the start of November and over the rest of the month caught... [more]

* 19:26 * link · travel · comments (0)

the only way is up

Hamish talked me into indulging in a bit of camera tossing with the Lomo ActionSampler the other weekend at... [more]

* 17:42 * link · photos · comments (0)

not half bad

I'd been intrigued by the phenomenon of half-frame cameras and picked up what turned out to be a non-working... [more]

* 17:33 * link · photos · comments (0)

another one

I've bought a new camera in time for the impending holiday - it's a lot more compact than the... [more]

* 20:41 * link · photos · comments (0)

eye on

Two more photo sets: grime, thanks to a ride on a tram with a spectacularly grotty window. A Docklands photowalk... [more]

* 19:20 * link · photos · comments (0)

on and on and on

A new set: repetition. more to come as I trawl the archives for other photos that belong here.... [more]

* 09:55 * link · photos · comments (0)


I walked from Preston yesterday morning, starting off somewhere near the three cats pictured above, and ended up in... [more]

* 14:06 * link · photos · comments (0)

the weekend in photographs

I was fortunate to get out walking a fair bit this weekend - work was bringing me down in numerous... [more]

* 17:49 * link · photos · comments (0)

more distractions

The rest of those Brunswick walk photos are up, by the way. photos... [more]

* 13:38 * link · photos · comments (0)

unsensored 08

Get yerself down to the Collingwood Gallery on 292 Smith St over the next 2 weeks to see some of... [more]

* 13:21 * link · art · comments (0)

little distractions

Finally, a morning where I could go for a wander. Time's been tight, lately. Brunswick's never too far away,... [more]

* 22:07 * link · photos · comments (0)

new toys

I haven't had much free time to drag the DSLR around much lately - almost all my recent photos have... [more]

* 21:32 * link · photos · comments (0)

heading south

There's always something to see, around Sydney Road. I needed a refresher walk (well, that and I wanted to... [more]

* 21:40 * link · · comments (0)


Thanks to a wonderful gift from two friends, Lian and I woke up real early on Australia Day to... [more]

* 21:11 * link · · comments (0)

me and my 20mm lens

Happy new year. Here's a few photos from a walk I took this morning, while the weather had cooled down... [more]

* 15:51 * link · · comments (0)

a quiet afternoon

I haven't been out much with the camera lately. Well, I did haul it around on the weekend, but... [more]

* 20:48 * link · photos · comments (1)

wall of E electric guitar ensemble, 2007-08-19 at carni

Another night of experimental guitar goodness at Carni, this time culminating in Barnaby Oliver's Wall of E Electric Guitar... [more]

* 21:41 * link · music · comments (1)

always greener...

Well, let's see if this ipernity thing works. I'm glad I forked out for Picturesync all that time ago.... [more]

* 10:07 * link · photos · comments (0)

a walk in the asphalt eden

Now that the house-hunting's over, I could finally get out for a walk with the camera. After being reminded of... [more]

* 12:44 * link · photos · comments (2)

the boats, the immediatists and zac keiller at carni, 2007-05-25

I got down to Carni last night to see Zac Keiller, The Immediatists and The Boats put on a... [more]

* 20:22 * link · music · comments (4)

pink stainless tail album launch at the tote, 2007-03-30

I went to The Tote last night for the launch of The Infinite Wisdom of The Pink Stainless Tail. Biddy... [more]

* 20:27 * link · music

last.fm and gig photos

It looks like last.fm is leveraging flickr's machine tags in the next update so that event pages will pull photos... [more]

* 10:49 * link · music

lakes of russia at the after dark

Lakes of Russia did another gig at the After Dark bar. Great stuff if you're into fairly laid-back one-man... [more]

* 22:55 * link · music

more immediacy

The Immediatists are getting better each time I see them - it's a shame to see only a handful... [more]

* 18:46 * link · music

Pink Stainless Tail photos from last night

36 photos from last night's gig at the Brunswick Hotel. I'd never seen that many people in there when... [more]

* 17:04 * link · music

the immediatists, last night

The Immediatists brought us about 2 hours of improvised music which I really quite enjoyed - some (most) moments... [more]

* 14:04 * link · music


I've got through to the end of my holiday photos - about 20% of them are up there at... [more]

* 22:17 * link · travel

there's a word for it

I've been back for a couple of days, recovering and getting back into work (and, today, catching up on... [more]

* 23:21 * link · music

four thousand

4000 photos up at flickr, now. If you reckon I'm missing something you particularly like in my favourites set,... [more]

* 21:25 * link · photos

mark murphy (ripe) at the tote

Down at the Tote, Mark Murphy indulged some of us by playing some of the tracks from Ripe's The... [more]

* 11:39 * link · music

remember my old photo site?

Thanks to phpFlickr I've done a quick bit of work on elsewhere's front page to show recent flickr photos and... [more]

* 21:44 * link · site news


My camera's having its sensor cleaned (at last), so I was left to wander the north on a perfectly cloudless... [more]

* 15:58 * link · music · comments (0)


I'm not sure what's in the air at the moment, but while I'm still recovering from the holiday and... [more]

* 11:26 * link · linkage · comments (1)


Back home, but moving straight away. Goodbye Northcote, hello Preston. Of all the airports I passed through, Melbourne Airport was... [more]

* 15:40 * link · travel · comments (0)

cheap thrills

I got my first ever film camera from Lian, a Lomo Actionsampler. Here's the photoset - the 7 shots... [more]

* 16:31 * link · photos · comments (0)

spin cycle

A new set over on flickr, because the humble Laundromat is full of photographic opportunities.... [more]

* 22:54 * link · photos · comments (0)

from another room

Not too long ago, I collected all my photos of stuff written on walls right here. Have fun.... [more]

* 14:25 * link · photos · comments (0)

she reassured me with an unfamiliar line

Merry Christmas.... [more]

* 22:44 * link · photos · comments (2)

gorgeous last ever gig, northcote social club 2005-12-06

Despite the various things conspiring to keep me away from live music lately, I made it down the street... [more]

* 07:59 * link · music · comments (0)

wagons are doing a sunday arvo residency at the earl of lincoln

...through October, from 4pm. Funny man Henry Wagons is still at it. If you're feeling idle, or just passing by... [more]

* 20:35 * link · music · comments (0)

high vibes, 2005

I didn't manage to wade through the crowds into one of the venues to see any bands, but I... [more]

* 12:03 * link · photos · comments (1)

snarski vs snarski, 2005-09-04 at the nsc

About 18 months after the last time, Mark Snarski was back in town and he teamed up with brother... [more]

* 22:00 * link · music · comments (0)

i started a joke

uh, I mean, a group. On flickr. Australian Live Music. Post 'em if you've got 'em.... [more]

* 11:46 * link · photos · comments (2)

the pink stainless tail at cumbersome records

A rather small crowd gathered to watch The Pink Stainless Tail do an in-store gig at Cumbersome Records (yes,... [more]

* 08:07 * link · music · comments (3)

he's the draught master, baby

I popped along to the Bluestone to catch this year's beer pouring competition, officially entitled the 2005 Stella Artois Draught... [more]

* 17:51 * link · food and drink · comments (0)

ed kuepper and jeffrey wegener at the NSC, 2005-07-13

[ update: I've uploaded the rest of the photos I figured were worth uploading. ] Here's the Flickr set for... [more]

* 11:30 * link · music · comments (2)

the new new fall

Synaesthesia moved up the stairs to Level Two, so I popped by for a look - I picked up... [more]

* 19:15 * link · music · comments (2)

familiar sights

The Nylex Sign in Cremorne (Richmond) is back, after a bit of a dodgy start.... [more]

* 12:00 * link · linkage · comments (2)


I meant to go and take photos of the new Nylex sign in Richmond, but instead I wandered around... [more]

* 08:33 * link · photos · comments (1)


I got to hang around a hospital for most of the day while my girlfriend had some wisdom teeth... [more]

* 21:46 * link · reading · comments (0)

northcote town hall stencil art

From the Darebin City Council calendar of events for June 4th: Invitation to all Stencil artists to stencil the... [more]

* 17:07 * link · photos · comments (0)


I have a new camera lens, and the new Drones and Boredoms CDs. This somehow helps to make up... [more]

* 17:48 * link · music · comments (1)

beer and skittles

I've had plenty of people ask to use my photos for little projects. More recently, an old photo I... [more]

* 22:41 * link · photos · comments (0)

more hot air

This morning I was walking to work past Fawkner Park just after 7am, and the balloons were taking off.... [more]

* 08:48 * link · photos · comments (0)

getting the worm

Getting in to work early is its own reward, or something. [ more hot air balloon photos. ]... [more]

* 10:28 * link · photos · comments (0)

we are glass

Heaps of old band photos from the 70's and 80's. Even Gary Numan's there (via).... [more]

* 10:11 * link · music · comments (0)


There's a new photoset for pictures I've taken on my morning walks.... [more]

* 11:58 * link · photos · comments (0)

gentle ben and his sensitive side's return to melbourne

There comes a time, mid-song, when Ben Corbett starts shaking. Each drumbeat's a gunshot and he twists, turns and... [more]

* 11:15 * link · music · comments (3)

love chaos meat revolution

This kind of discovery makes it worth getting up for an hour's walk in the morning before work. At... [more]

* 19:52 * link · photos · comments (0)


I've had a little bit of photo-taking time again, finally. On a vaguely related note, "my god it's full... [more]

* 19:27 * link · linkage · comments (0)


I whacked up a handful more early trip photos, but can't seem to put them in the right place... [more]

* 21:30 * link · photos · comments (0)

why did the cassowary cross the road?

I'll be home friday arvo. I might have to upload my Daintree photos then, since flickr currently isn't behaving.... [more]

* 13:10 * link · photos · comments (0)

i wanna live in a bathysphere

when I was seven my father said to me 'but you can't swim' and I've never dreamed of the sea... [more]

* 19:40 * link · travel · comments (1)

make like a tree

I've made it to Port Douglas. I'll catch up on the earlier photos later on, but I've posted a... [more]

* 13:39 * link · photos · comments (0)


. Just a quick one from the Beef Capital of Australia, while I've got hold of some wireless net access... [more]

* 15:53 * link · photos · comments (3)


The artincities project wants your photos of, uh, art in cities. Drop by and submit it if you've got it.... [more]

* 21:20 * link · photos · comments (0)

urgent pear delivery for mr wagons

I walked over (just past the new 3RRR offices) to Ceres in Brunswick to catch The Handsome Family, who were... [more]

* 16:48 * link · photos · comments (0)

two shaves and a shine

Special design by Steven Stapleton. Only 100 to be printed - by the time my copy of The Wire... [more]

* 17:11 * link · clothing · comments (0)

not just for breakfast

I'm not entirely sure what to make of this, but there you go.... [more]

* 17:26 * link · linkage · comments (0)

easy listening hour

Well, it took until today, but the first thing I listened to was all the Richard Buckner I had... [more]

* 17:46 * link · music · comments (0)

from a 727 at night

The good thing about working at branch offices is that you can't usually pull 12 hour days because nobody there... [more]

* 08:16 * link · photos

here and there

It's nearly the end of the month, and despite being buried beneath a large pile of work, I've at... [more]

* 21:52 * link · photos

please no hands

photos from my work trip to perth and sydney [more]

* 10:51 * link · travel

roll out the trundle wheel

Another quick meander around the back-streets of Brunswick (and one or two from over Preston-way): [ start here for Saturday's... [more]

* 13:54 * link · photos

catching up on photos

I had a month of being too busy to go for a walk, but on the weekend before last I... [more]

* 13:46 * link · photos

she said "we can't all live in semi-detatched houses"

I haven't been a-wandering much this month, apart from a nice hour's walk on Sunday morning. More to come.... [more]

* 20:45 * link · photos

rowland s. howard, gentle ben and his sensitive side at the rob roy, 2004-04-30

Rowland S. Howard put on a pretty good show, finishing up as usual with the wonderfully brooding Panic Moon... [more]

* 00:23 * link · music

snarski vs snarski, anzac day eve at the cornish arms

a few photos from Saturday night's Rob and Mark Snarski gig. [more]

* 19:26 * link · music

they'll never find me 'cause i'm lost in miller's cave

another long walk, with some photos. [more]

* 12:45 * link · photos

previous lifestyles

i took a walk near home. [more]

* 22:09 * link · photos

sand in my sandals, my blood feels like red wine

Photos from Thailand - Hua Hin, Chiang Mai, Pai, Bangkok. [more]

* 21:03 * link · travel


Photos from Malaysia. [more]

* 12:01 * link · travel

notes from the waiting room

photos from my Singapore 2004 holiday [more]

* 12:45 * link · travel

happy australia day, or something

[ see the rest of this month | collect the set. ]... [more]

* 15:46 * link · photos

you're the apple of my eyelash

I decided around the end of last year that I'm taking February off (yeah. all of it), so it's probably... [more]

* 13:39 * link · travel

pretzels for pacman?

I've still been taking photos, mostly just Melbourne ones, though I haven't been mentioning it here. Here's a few from... [more]

* 10:53 * link · photos

investigating the trivial

Essendon Airport isn't so far from Ascot Vale. 2 hours' walk, more or less. But rather than heading north at... [more]

* 18:58 * link · travel

nearly there

August photos are up. There's still a few more to go, though.... [more]

* 19:30 * link · photos

backlog, part 2

May photos are up. Enjoy.... [more]

* 18:04 * link · photos

backlog, part 1

April photos are up. Enjoy.... [more]

* 23:51 * link · photos

the end of a minor drought

I received an e-mail from another expat this morning, telling me how much he enjoyed my melbourne photos. This made... [more]

* 16:25 * link · photos

pharmacy records at the rob roy, 2003-08-01

I was a bit too disorganized to make it to Yo La Tengo (who were apparently very good) or... [more]

* 22:02 * link · music

the mountain goats at the tote

John Darnielle (ie. The Mountain Goats) was in fine form last night, providing a show full of wit (both... [more]

* 12:20 * link · music


via realkosh (sorry I didn't make it to yer gig at the Cornish Arms last night - wasn't quite up... [more]

* 12:56 * link · photos

the go-betweens, 2003-06-26 at the corner hotel

Robert Forster's looking rather stately as the years go by, with his silver mane and all. Grant McLennan's looking... [more]

* 17:17 * link · music


Last Thursday's Go-Betweens photos will be up soon, honest - I just haven't had a free evening to sort through... [more]

* 09:59 * link · photos

take me out to the suburbs

?> A few more photos from my random wanderings. Glenroy certainly has some interesting shops - apart from the ones... [more]

* 20:40 * link · photos


Kurt Wagner looked very..."country" last night. Not "country" as in cowboy, but "country" in that cap-wearing, big-glasses, blue jeans... [more]

* 21:13 * link · music

do you want new wave or do you want the truth?

More walking around the new surrounding suburbs. North, east and east and east to Merri Creek, then back down... [more]

* 17:06 * link · photos

border stories

I live north of North Melbourne. I've got a lot of exploring to do. Lines and metal and wood... [more]

* 18:13 * link · photos

keep yer southern love away from me

The Rob Roy's front bar has a door flanked by their two heroes (I guess) - Clint Eastwood and... [more]

* 21:57 * link · music


Catching up on recent photos : Golden Rough at the Candle Records gig at the Corner on the 15th of... [more]

* 22:34 * link · photos

calling the shots

I've been a bit camera-lazy lately, but here's a few more from the other day (I did the rather... [more]

* 21:27 * link · photos

bees in yer bonnet

There we were, happily lunching outside City Café (yes, again) when a swarm of bees appeared out of nowhere,... [more]

* 16:21 * link · photos

trifekta records boat party, 2002-12-22

acb and I hopped aboard the Victoria Star for the Trifekta Records boat party, where I also ran into... [more]

* 19:18 * link · music


I took a 2.5-day micro-vacation(?) with my parents down to Flinders, on the Westernport Bay-side of the Mornington Peninsula.... [more]

* 18:48 * link · travel

grand salvo farewell gig at the carlton courthouse, 2002-11-12

It was intimate, crammed into the Carlton Courthouse with a sort of amateur theatre feel to the whole thing.... [more]

* 22:50 * link · music

running from the body

Another day, another long walk home. It was a nice day for being alone, though. [ the start of... [more]

* 23:19 * link · photos

rowland s howard at the empress, 2002-11-04

Well, ok, the headlining act was Silver Ray but I ended up deciding to leave before they came on (though... [more]

* 10:46 * link · music

harvest festival 2002

I didn't make it to all of this year's Harvest Festival, just the Corner Hotel and Raoul Records bits. At... [more]

* 21:47 * link · music


via acb the other day, I finally got around to poking through ziboy's very nice photos, mostly of people. Personally,... [more]

* 22:14 * link · photos

things to look forward to

I took a few quick photos yesterday during a quick escape-style lunch in Chapel St. It's nice to have... [more]

* 23:03 * link · photos

things to do on a sunday evening

I've done a bit of work on my photo site, making the icon-sized versions of the pictures a bit bigger... [more]

* 22:27 * link · site news

the surrogate, 2002-09-05 at boutique

I'll fully admit to having fairly low expectations, given that an old friend I hadn't seen in ages had... [more]

* 17:43 * link · music

you need a mess of help to stand alone

3 hours to kill before meeting a friend in Phoenix (a nice place to bum around on a Sunday... [more]

* 21:17 * link · photos

bricks and sentiment

More practice and exercise. Chai in Café Sahara, watching all the onslaught of new buildings across the street. Treasure-hunting... [more]

* 13:46 * link · photos

josh rouse at the corner hotel on august 22nd

He asked, "so, do you guys know who I am, or is this just 'the place to be' on... [more]

* 22:28 * link · music

the other sort of exercise

I'd lent my camera to somebody for a week, so I figured I should exercise it (and myself) while... [more]

* 16:55 * link · photos


Perhaps the first thing I miss about Singapore is not being able to buy lime juice to drink, wherever... [more]

* 19:31 * link · travel

scary marketing

"Fill these slots with functionality" ? "Modularity Cafe" ? Somebody at Cisco oughta lay off the happy pills.... [more]

* 10:42 * link · geek

local harvest - a neil young tribute at the corner hotel

Pretty much at the last minute, I decided to go and catch the Neil Young tribute (called Local Harvest)... [more]

* 20:22 * link · music

passing through

I had my usual weekend brunch at City Cafe, and from there I walked down Barkly St to blustery... [more]

* 16:36 * link · photos

when you're drifting

Apologies for the, uh, dearth of photography in recent times. My camera goes nearly everywhere I do, but I've... [more]

* 16:52 * link · photos

mr johnson

Resident shiny new guitar owning vinyl idolizer Vanessa took some photos the other night. Unfortunately I've no idea of the... [more]

* 15:01 * link · photos

bleak street

After lunch in Smith St, I walked down a lonely Collingwood street under cloudy skies while I tried to... [more]

* 17:21 * link · photos

golden rough at the empress, april 25th

I must say, Dave Orwell of esteemed Sydneysiders Golden Rough reminded me a heap of a guy who works... [more]

* 19:23 * link · music

grand salvo album launch gig, april 21st

For a guy who appears to embody the loner mould on stage better than say, Mark Eitzel or Joe... [more]

* 18:46 * link · music

proclaiming his joy

"if I had a song that could dissolve you like sleep..." Well, ok, he tripped on the stairs coming... [more]

* 20:14 * link · music

steve earle, dan brodie

Bruce and I caught Steve Earle's final Melbourne gig at the Prince of Wales. He played a good range... [more]

* 19:57 * link · music

meeting people is easy

I'm probably the last one to have mentioned it, but some blogging types met up yesterday in North Fitzroy,... [more]

* 15:18 * link · photos

the go-betweens with the lucksmiths at the corner hotel

"Ok, you've caught us out," said the Lucksmiths' drummer/vocalist. "We're actually miming to that guy down there," acknowledging the... [more]

* 18:07 * link · music



* 11:21 * link · photos


what are you reading at ?... [more]

* 21:57 * link · photos

mr walker

I walked from the nether-regions of Southbank, where the trams were banked up on their detour from the St... [more]

* 17:30 * link · photos


I hadn't been to St Kilda, post-Grand Prix, so I wandered down in my lunch break for a quick... [more]

* 13:55 * link · photos

a walk in the black forest

I walked across Prahran for an optometrist appointment, dodging empty wheelie bins and bottle recycling buckets strewn across side-street... [more]

* 17:11 * link · photos

...and back again

gone already. over and out. I took the SkyBus back to the city and walked around for a while,... [more]

* 19:35 * link · photos

odd objects

The things you find in K-Mart carparks...... [more]

* 20:52 * link · photos

it's a sick sick building but it's never gonna make me insane

Some days, it's harder to concentrate than others. Some days, you almost wait for the thud as the air... [more]

* 11:34 * link · photos

saturday night's alright for a wedding

Scott and Emily got married upstairs in Retro, a nice cafe in Brunswick St, Fitzroy. I didn't take many... [more]

* 18:32 * link · photos

too hot to think

Yesterday, I walked around the city, and then the airport, until my feet hurt. It was a hot day,... [more]

* 17:51 * link · photos


Hungover on Tuesday.... [more]

* 14:27 * link · photos


I've been quietly watching the days go by. Mum gave me a copy of No Logo for Christmas. I'd... [more]

* 13:55 * link · photos

a bit of catching up

I wasn't quite feeling up to doing much with the camera over the past week or two, but I... [more]

* 21:30 * link · photos


I walked up Chapel St again, trying to take photos of things. I'll have to try harder next time... [more]

* 23:09 * link · photos

wedding season

Congratulations Darren and Fleur. Next stop, Scott and Emily next month. [ all pictures from the wedding ].... [more]

* 16:39 * link · photos

the captain and his gloves

It starts with this scraping sound, as I walk up the street towards the tram stop just before 7am. Ok.... [more]

* 10:11 * link · photos

my lost weekend

A day of celebration, drinking, (extremely) amateur sport and general merriment as a precursor to Darren's upcoming wedding. [... [more]

* 22:41 * link · photos

original spirits

New Year's Eve, somewhere in Abbotsford (as usual), 2001. This time I didn't have to worry about taking most... [more]

* 22:38 * link · photos


I don't really understand the kind of magnetism these power lines wield over me, but they've always been there... [more]

* 17:38 * link · photos

the view out the window

I found myself back in the habit of going next door for a coffee before settling down to work.... [more]

* 12:11 * link · photos

a short drive

We went for a short drive, from the work christmas lunch to the hospital to check in on a... [more]

* 22:54 * link · photos

you're not an airplane

This is about the most energetic you'll see me. On the way up to Glen Iris, I'd noticed a... [more]

* 21:34 * link · photos