Interesting. To me it is more of an art form than serious photography.
Many moons ago I tried a couple of rolls of B/W IR film. Needed a
special filter to block out visible light - made a slide on holder from
thin cardboard. Exposures were around f8 from about 0.5 to 5 sec (pot
luck!) which made a tripod mandatory - still have the very same tripod.
Manual guesstimate timing on "B" with a cable release. Focusing was a
nightmare because the filter was so dark I had to focus without the
filter & then slide it in and adjust to the IR mark on my Supertak 55/2
(which I still have!). Pity I didn't think of Larry's sticky tape astro
method to lock the focus. Only 2 or 3 shots out of the 48 were even on
the verge of acceptability so that was the end of my adventure.
Alan C
On 13-Jul-23 04:59 AM, Larry Colen wrote:
On Jul 12, 2023, at 7:06 PM, John Sessoms<jsessoms...@nc.rr.com> wrote:
On 7/12/2023 7:59 PM, Larry Colen wrote:
On Jul 12, 2023, at 4:47 PM, John Sessoms<jsessoms...@nc.rr.com> wrote:
I had my K20D converted to Amplified Color (665nm) IR.
Had my first chance to test it out today. Didn't notice they'd reset the
default output to JPEG, so I'm going to have to make another test outing.
Yeah, that bit me when I took my K20 to burning man after having it repaired.
When I got home and started to process the photos I couldn't figure out why
they wouldn't adjust properly.
First thing I've noticed is it doesn't seem to work very well if it's not bright
sunlight. Test shots I took indoors don't show ANY image unless I boost the ISO way
high & use high exposure compensation.
So you have it blocking all visible light?
"IF" I understand what they did, they replaced the regular IR filter with
another filter that passes IR below 665nm so that I get visible light PLUS the upper end
of the IR spectrum ... ???
You *should* be able to get shots indoors just as you would with a standard
camera.
IR is supposed to be really good for harsh daylight (shooting in the middle of
the day), so I took it out from 1:00 to 3:00 today to photograph a field of
sunflowers that are just coming into bloom.
I had it at F8 using the SMC Pentax-DA 1:1.8 50mm lens it seems like everything
is really soft (out of focus?) except for stuff out on the horizon.
I've got to go out and make another test, but anyone got ideas?
You'll need to focus based on the live view, which is what the sensor sees,
either that or manually focus based ton the distance scale and the little red
dot that shows the IR focus point. The autofocus system focuses for the visual
spectrum, but IR focuses differently.
Hmmmm? The K20D has live view?
Hmmm, that’s an issue. Maybe take some test shots and look at the preview
screen zoomed in.
If you photograph under LED or fluorescent light there should be no IR.
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