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Old 13-06-2009, 17:10   #1 (permalink)
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Hi gang, a few IR questions.

Hiya all, I was just wondering if anybody could give me a few tips on IR photography using the R72 filter.
As I understand it you take a pic of something green with the filter on and then set this to custom wb.
Tripod long exposures etc.
The main problem I am having is the processing of the raw files, any tips would be greatly appreciated. I have looked through several threads on here already and done some research on google, however I know Dave and a few others have done some great Ir stuff that I have seen on here.
Any help tips and advice would be greatley appreciated.
Cheers.
Oh and Hi, sorry I aint been on in ages
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Old 13-06-2009, 18:10   #2 (permalink)
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Re: Hi gang, a few IR questions.

I wouldn't worry about the WB until you get back to your 'puter

I use the WB dropper tool in ACR. Even then you still get a red/pink tint. My D90 has a much better low-pass filter than me old D50 but other than the length of the exposure, it makes no difference to the colouring in the image.

Ultimately - at least with an unconverted camera, can't speak for converted ones - you'll always have to convert your image to mono before you can do much with it.


Here's examples of what you should be getting...
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Old 13-06-2009, 18:44   #3 (permalink)
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Re: Hi gang, a few IR questions.

Cheers OP, Ive also found im getting a bit of a hotspot in the centre of the image, ill google that problem later.
As for focusing, I know you used to have to refocus to the red mark on manual cameras but, with modern auto focus does the cameras focusing system focus on the ir light coming through the filter meaning no adjustment is needed or am i being a typical yorkshire man here.
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Old 13-06-2009, 19:07   #4 (permalink)
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Re: Hi gang, a few IR questions.

I get a hotspot too. It's down to the lens as I understand it. It's easilly fixed in PP (i use a very soft & transparent brush and paint gently in black then switch the layer mode to overlay).


As for focus, that I can't tell you I'm afraid. I'm on the sigger 10-20 and generally just manual focus @ infinity anyway. The difference in DOF is measured in mear cm's so I don't worry about it.
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Old 13-06-2009, 19:20   #5 (permalink)
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Re: Hi gang, a few IR questions.

I guess it'll focus differently in IR but I've not noticed - and my AF works which is nice (use the IR sensitivity of the dustscreenless Sigma SD10 ). But I tend to use no R72, so get IR+visible pics (no hotspots and can view subject)
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Old 13-06-2009, 19:23   #6 (permalink)
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Re: Hi gang, a few IR questions.

Boofers would have some good input to.
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Old 13-06-2009, 19:34   #7 (permalink)
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Re: Hi gang, a few IR questions.

Hi Gazza

Well I'm sure you read this 1st :- http://www.pixalo.com/community/tuto...ter-21548.html

Even with the dedicated IR camera I had, I found the dynamic range to be quite small. So within PS "Levels", pulling the left & right sliders in to meet end of curve definitely makes a huge difference in end shot.

I also found shooting to the right "exposure wise" kept the noise from shadows to a minimum.

Resulting shots were :- http://www.pixalo.com/community/phot...red-17701.html

Ref hotspot, yes there are some lenses that are not really suitable. From memoery with the Nikon the 50mm wasn't too good, but Sigma 10-20 was OK. On the Canon dedicated IR camera I found the 17-40mm L lens to be excellent, along with 24-105

Example shots here with 17-40 primarily :- http://www.pixalo.com/community/phot...wer-32716.html
http://www.pixalo.com/community/phot...urt-32783.html

Boofers shoots more IR than me, so should be able to point you in right direction
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Old 14-06-2009, 01:01   #8 (permalink)
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Re: Hi gang, a few IR questions.

Hi Gary,
My camera is converted so no filter experience here. The reason I went converted was to get the normal shutter times. I can use green for a custom white balance if I like and it works pretty good. I went to a expo-disc and was taking different WB at morning, midday and evening to follow the lighting and would stop just to take one if the lighting changed quickly. It seemed to help keep my histogram out of the dark side. I now leave the custom WB I have on camera because I get a deep bronze sky. It took a certain light to get it to shoot that way so when I had it, I left it. I will leave a lot of pictures with this deep bronze brown straight out of the camera. This is subjective, but I use a 2X ND filter 100% of the time, even if it's dark It will shift light blue hazy color to a light brown yellow and in my opinion leave the picture more clear from light casting. ACR does a terrible job with a straight IR WB so I've tried different programs. ACR works great if your going for the monochrome conversion, I am using Lightzone at the moment and find it to be quite adaptable. I like to see what my camera is shooting, so we're back to WB. I feel that different cameras handle WB differently so my favorite WB won't be the same on another camera. I only have that concept from talking to other people and the WB interpretation they offer. I also feel that IR in many cases gives better light tones in better places in a mono conversion then a color mono conversion. But a great monochrome conversion is just that, good to look at. If you don't want to convert a camera and still want to shoot IR, when the wind stops blowing, go out and shoot some pic's and they'll be just a good as anybody else's.
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Old 14-06-2009, 03:09   #9 (permalink)
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Re: Hi gang, a few IR questions.

I use the Cokin IR filter which is quite hard to get used to. I find I have to focus without it, then add the filter and adjust before taking the shot.

It's only good for mono IR images so post processing for me is **removing green and blue channels then any other PP adjustments required as per any other shot** -- Sorry had to edit as realised wrote the wrong process!

My camera is one that can be modded so when I get the K7 my *ist DS will be modified to do IR. I want to be able to do colour IR so should be interesting.

Will upload some of my attempts at IR with the cokin filter when I get home.

Last edited by heidi; 14-06-2009 at 12:22.
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Old 16-06-2009, 18:20   #10 (permalink)
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Re: Hi gang, a few IR questions.

Gary, I was just looking at Shanes "lions gate" picture in monochrome and thought about how good detail in rock, brick and stone work come out with IR. I haven't capitalized on that point but I have some good exsamples I'll try and post. Also it is long exposure friendly
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Old 16-06-2009, 23:30   #11 (permalink)
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Re: Hi gang, a few IR questions.

Interesting.... VERY interesting....
This is a subject I have never tried investigating, but, after this thread, its on my "To do "list....
Anyone got a spare round tuit?.... mine is rather full.......


("round tuit".... a round to it..... ok... ill get me coat.....)
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Old 17-06-2009, 01:28   #12 (permalink)
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Re: Hi gang, a few IR questions.

Taken f/11 1/40s iso100 24-105mm@24mm, sun was almost straight up and to my back. No hot spot with this lens but I have to use a hood. Straight out of the camera, contrast, sharpen. This is what I try to get with my settings, that deep bronze sky, makes an easy black sky when converted to mono.

[IMG][/IMG]
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Old 17-06-2009, 21:58   #13 (permalink)
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Re: Hi gang, a few IR questions.

That's very nice Boofers, lovely effect, defenitily be chasing up this filter to give it ago so thanx for the advice everyone that yous have give.
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Old 18-06-2009, 22:33   #14 (permalink)
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Re: Hi gang, a few IR questions.

Doin a bit of homework on this as well as the lith effect, whats the best IR filter to use then? i see by comments & some sites that the Hoya seems very popular
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