I watched a video on InfraRed photography that emphasized the utility of
shooting when the light is NOT so good; too hot, too harsh, to specular
in the middle of the day.
Even before Covid, I was having problems getting out and shooting in the
golden hours & IR looked like something I could do with the time when I
WAS able to go out & shoot.
With digital you can get some kind of immediate feedback so it's not
like shooting film. I hope it's going to complement my other
photography, not replace it.
AND I think some of the apparent problem with the focus is the softness
of in camera JPEG conversions. AND ALSO ... I'm at the very beginning of
the learning curve.
Further, I've re-read the explanation about (665nm) IR. I now think it
cuts off the color in the blue & green part of the spectrum leaving the
spectrum ABOVE 665nm - oranges, reds & invisible InfraRed ...
Anyway, I'm still learning.
On 7/13/2023 2:53 AM, Alan C wrote:
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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