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The lists of lenses which avoid flare seem rather limited. I wish to buy a wide angle zoom Sigma or Canon 17-50 or 17-70. Does anyone have experience of these.
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Suitable for IR (no or minimal hot spot):
Canon EF-S 10-22mm f/3.5-4.5
Canon EF 17-40mm f/4 L
Canon EF-S 17-85 f/4-5.6 IS USM
Canon EF 22-55mm f/4-5.6 USM
Canon TS-E 24mm f/3.5L
Canon EF 24-70mm f/2.8 L
Canon EF 28-135mm/3.5-5.6 IS
Canon EF 28mm f/2.8
Canon EF 50mm f/1.8 MKI
Canon EF 50mm f/1.8 MKII
Canon EF 70-200mm f/4 L
Canon EF 70-300mm f/4-5.6 IS
Canon EF 75-300mm f/4-5.6 IS
Canon EF 100-400mm f/4-5.6 L IS
Canon EF 100mm f/2.8 Macro
Canon EF 135mm f/2 L
Sigma 400mm f/5.6
Tamron 28-300mm XR
Not suitable for IR (hot spot):
Canon EF 15mm f/2.8 fisheye
Canon EF 16-35mm f/2.8 L
Canon EF-S 18-55mm f/3.5-5.6
Canon EF 20mm f/2.8
Canon EF 20-35mm f/3.5-4.5 USM
Canon EF 24/2.8
Canon EF 24-85mm f/3.5-4.5
Canon EF 28-70mm f/2.8 L
Canon EF 28-105mm f/3.5-4.5
Canon EF 35mm f/2
Canon EF 35-80mm f/4-5.6
Canon EF 50mm f/1.4
Canon EF 50mm f/2.5 Macro
Canon EF 70-200mm f/2.8 L IS
Canon EF 70-300mm f/4.5-5.6 DO
Canon EF 85mm f/1.8
Tamron 70-300mm Macro
Just as one example from Sam's 'Not Suitable for IR' list, this was taken with the Tokina 12-24mm and was my first attempt with an R72 filter - and on the wrong camera. The Nikon D200 has a particularly effective IR cut filter in front of the sensor and that exposure was 60secs!
The 'hot spot' is very evident.
It is not just hot spots you need to worry about but inability to focus and flare. My experiences are limited to four lenses:
Canon EF-S 10-22mm f/3.5-4.5 - excellent, sharp images, no hot spot or flare and focusses across the image
Sigma 12-24mm f4.5/5.6 - unusable, out of focus apart from the central area, flare is very poor
Canon 24-105mm f4 L IS - Excellent lens for visible light and IR, in focus across the image, no hot spot or flare problem (My first choice lens for IR)
Canon 70-200 f2.8 L IS - said to have a hot spot but I have not yet really checked this lens as I normally use wider lenses for IR
While I can only find anecdotal evidence on the web, I have found consistent recommendations for the Canon 24-105mm f4 L IS fir IR.
I have the sigma 17-50, it is ok most of the time, but you never know when the hotspot will appear. so I now use the canon 17-85mm, and on occasions I use the sigma 10-20 with no problems, I do have a weird story with the 10-20 lens, I experimented with different " channel swap" actions I made, I wanted to get the colour green into the swap, after about 30 hours over 3 weeks I succeeded, but it only worked with the sigma 10-20, I cannot get to work as well on the 17-85 canon. the effect is very much diluted, with the 17-85 canon & 17-50 sigma. any ideas?
The Painshill park picture is the new action I made, I love it, its what I aimed for, but why does it not work as well with other lenses, the only thing that can be the cause is the coatings?
If you are getting a different effect and the only difference is the lens then it must be the optical characteristics of the lenses. While I am surprised there would be a lot of difference, it is more difficult to spot colour differences given we have false colours anyway.
Do you wish to share the secrets of your action so we can try with other lenses/images?
The original colour balance used will have a big difference in the colours achieved. I can see how a lens can have a difference, the coatings used, may react differently under the IR part of the spectrum. As Dave says we would need to know what your channel swap action is doing to be able to help more.
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