eftychia: Cartoon of me playing electric guitar (debtoon)
Add MemoryShare This Entry
posted by [personal profile] eftychia at 02:41pm on 2007-03-09

I often find myself reaching for a camera in low light situations where a flash is inappropriate or what I want to capture is the lighting itself. So I've shot a lot of what is customarily called "available light" photography, which a bandmate dubbed "available gloom".

I also favour longer lenses; often, what fascinates me is some small detail across the room, or just a candid moment -- a fascinating facial expression, for example -- that I'll interrupt if I move close enough to distract the subject.

The problem, of course, is that longer lenses don't usually open up to the wider apertures to let in enough light for "available gloom" shooting.

But thanks to someone on the Pentax-Discuss mailing list, I now know what lens I want.

No, no, do not tell me how much it costs, and especially do not tell me how much it weighs; you'll spoil my daydream. While you giggle, I'll be over here envisioning ways to make that thing less conspicuous at a medieval feast ...

There are 14 comments on this entry. (Reply.)
 
posted by [identity profile] skreidle.livejournal.com at 07:47pm on 2007-03-09
Holy bazooka lens!
 
posted by [identity profile] jmthane.livejournal.com at 08:04pm on 2007-03-09
A stand cleverly disguised as a tree.

Or you could always try "look - a monkey!"...
 
posted by [identity profile] keith-m043.livejournal.com at 08:04pm on 2007-03-09
that lil' bump on the right hand end is the camera? :3
 
posted by [identity profile] dglenn.livejournal.com at 10:07pm on 2007-03-09
Yup, that wee bump on the end is the camera. :->
 
posted by [identity profile] writerjanice.livejournal.com at 08:07pm on 2007-03-09
In the same situations, we use an old Vivtar Series I 90mm F2.5 Macro lens on a Canon body. It's really a portrait lens but it's usually fast enough to deal with such low light scenes. It's actually rather small, about 4 inches long. The shutter noise was more noticeable than the lens (old Canon 35mm with mechanical shutter.)

Now we're playing with a couple of different fancy point & shot digital cameras with add-on lens. I suspect that before we're done, we will end up with one of the Canon digital SLRs...

Janice
 
posted by [identity profile] dglenn.livejournal.com at 10:31pm on 2007-03-09
I used to have an 85mm f/2 that I really, really liked (it got stolen), and I've used a 135mm f/2.5 screwmount handheld in candlelight (TMZ is my friend; so is Delta 3200). And of course there's the 50mm f/1.4 when I don't need telephoto. But I keep wishing that my 200mm and my 100-300mm zoom were faster than f/4 or that my 400mm were faster than f/5.6.

Though as a Canon shooter you theoretically have access (assuming enough time to hunt for it and enough money to pay for it) to the 50mm f/0.9 lens, the ultimate low-light normal lens. Even with a 2x converter, it'd still function like a f/1.8! AFAIK, the fastest Pentax is f/1.2.

As for a DSLR, I got to borrow one for an afternoon several months ago, and ooooh that was fun. The one I played with was a Nikon; if I had the money to buy one, I'd be looking at Pentax first, to be able to use the lenses I already own.
 
posted by [identity profile] whc.livejournal.com at 08:21pm on 2007-03-09
Wow!

I think an IR flash might be a bit more practical.
 
posted by [identity profile] dglenn.livejournal.com at 10:46pm on 2007-03-09
I'm still planning on making a couple of those, as well, for when the lighting of the scene itself isn't what I'm trying to capture, though that pretty much limits me to black and white (of course, so does shooting at 6400 ASA, which is the solution I already use).

Putting an IR filter in front of a Xenon strobe results in a) an awfully low guide number (I shot a roll at home that way to determine that -- I'll have to go find those negs to refresh my memory regarding what the result was), and b) just enough visible light leakage through the filter that others see a red light blink over me. I haven't used it enough to find out whether other people find the red blink distracting or not.

I'm hoping to get more range out of a whole mess o' IR LEDs mounted next to each other. (I'm not sure how much I can get away with overdriving an LED for a really short time like that, but also don't know whether I'll need to overdrive them in the first place -- I get the impression that IR LEDs are a lot brighter than visible LEDs.) I just need to a) get around to building the darned thing, and b) find out experimentally whether the LEDs put out enough energy in the wavelengths Kodak HIE is sensitive to that most of the power I dump into them will wind up being useful. (How narrow is the output band of an IR LED?)
 
posted by [identity profile] whc.livejournal.com at 12:31am on 2007-03-10
When I start unpacking, I'll see if I can find any of the Honeywell Strobonar flashes I got on ebay years ago. Starting with a high guide number flash would help.

The IR LEDs are an interesting idea. The light spectrum is very narrow, usually in the very near IR region. For a single pulse of a millisecond or so, I suspect you could easily overdrive then 100x or more.

BTW, cell phone cameras usually omit the IR blocking filter, so they can be used for verifying that the LEDs really light up, etc.
 
posted by [identity profile] writerjanice.livejournal.com at 05:42am on 2007-03-10
One of the big "new thing" in video and pro still work is the use of LED lights. I don't know that work has been done with IR wavelengths, most of the work I've seen has focused on getting more energy into the visible bands.

Subjects like the LED lights because so little heat is projected on them. Of course, the heat then shows up at the power pack.

Janice
 
posted by [identity profile] n5red.livejournal.com at 09:09pm on 2007-03-09
Oh, now I need a dry set of pants...
 
posted by [identity profile] jim-p.livejournal.com at 09:46pm on 2007-03-09
Well, in a theatre situation you could disguise the thing as a klieg light... dunno about a ren fest though :)
 
posted by [identity profile] writerjanice.livejournal.com at 06:01am on 2007-03-10
lol. I'm trying to figure out how to "disguise" a couple of condenser microphones, stands, a laptop & small mixer at SCA events. Sometimes, the best performances of our local groups are at events, not in a recording venue.

Janice
 
posted by [identity profile] madbodger.livejournal.com at 02:55am on 2007-03-12


There is also always the idea of using an infrared flash...

Links

January

SunMonTueWedThuFriSat
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24
 
25
 
26
 
27
 
28
 
29
 
30
 
31