Since the weekend, I've been testing an Opteka IR filter (72R) on my K200d at 400and later 800 ISO. Shutter speeds have been long. About 15, 20, 25 seconds at F11 or F22, because anything less produces very non usable images. Unless I am doing something wrong.

These are really snapshot/tests.

I am a newbie to PP. I am hopeful someone can provide me with some PP direction. I am using PE6 and the Topaz DeNoise trial version.

[metaphiston]

Very nice contrast and classic IR white-appearing greens, I particularly like how the long exposure had given the motion effect to the clouds.

[Horst-Helmut]

Same setup as mine, even to the point of being a noob at PP.

I like the last one most.

[freeload]

t F11 or F22, because anything less produces very non usable images. Unless I am doing something wrong

I remember reading that IR messes up the focusing...I'll do some digging.

...

You need to focus in front of your subject in order to get a sharper image (or use F11 and higher to utilize DOF)

http://lifepixel.com/
Infrared light, being located to the right of visible red light, has a longer wavelength and thus focuses at a slightly different point. Because of this most lenses have a red infrared focus dot offset from the regular focus mark so that the photographer after focusing on visible light can move the focus ring to align with the red infrared focus dot.

dpanswers.com/
To get an infrared image in focus by means of using the distance scale engraved on the lens barrel, it must be short focused (i.e. you need to focus closer than you normally would).

wikipedia
However, it should be noted that diffraction effects inside a camera are greater at infrared wavelengths so that stopping down the lens too far may actually reduce sharpness.

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Last edited by freeload; 08-19-2010 at 04:15 AM. Reason: Did som digging

[jezza323]

great shots! i also have a k200d and use a hoya r72 filter for some IR shots. this body seems to have a very strong ir blocking filter on the sensor, so your long shutter speeds are normal. i tend to find around f7.1, iso 100 - 200 and 30 secs, then adjust from there works well for me.

your pp looks great to me! ive found you cant really do "false colour" ir with this body, but the b&w's look great

you can check out some of my shots in my hoya r72 flickr set, you should be able to view the EXIF there too

[Jools]

Much obliged to all your responses and suggestions. It is a work in progress.

great shots! i also have a k200d and use a hoya r72 filter for some IR shots. this body seems to have a very strong ir blocking filter on the sensor, so your long shutter speeds are normal. i tend to find around f7.1, iso 100 - 200 and 30 secs, then adjust from there works well for me.

your pp looks great to me! ive found you cant really do "false colour" ir with this body, but the b&w's look great

you can check out some of my shots in my hoya r72 flickr set, you should be able to view the EXIF there too

Good to hear this directly from a K200d user. I really am not interested in faux looking IR. I prefer the IR from when I actually shot IR on film.

Nice shots, on your photostream, mate.
And thanks for the shutter info.

[jezza323]

no probs Jools

those settings are for in bright sunlight too btw

anything but bright sunlight, and your shutter speed will be far too long

[Jools]

That sounds about right given my brief leap into digital IR and its learning curve.
Thanks again.

[jezza323]

oh and another thing, i tend to use manual focus (focus before i put the IR filter on, then flick to manual) just avoid the problems with are said to exist with focusing through IR filters

[Rense]

Great shots, would like to do that one day too!!

[SJM]

I like these.. IR is on my list of things to learn ..