| Joined: | Mon Apr 2nd, 2012 |
| Location: | Carthew, Cornwall, United Kingdom |
| Posts: | 6877 |
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Some of the Sigma 10-20's don't respond well in the IR range, they seem to hotspot badly which may explain the vignetting, perhaps it isn't vignetting but hotspotting? I have had mixed results with my Sigma 10-20 I think Eric found it hotspotted badly on his D70 but I have had a little success on the D1, although not universal success.
I have spent days on a single image and while I may EVENTUALLY have got the effect I visualised when I composed the image, having spent so much time on it the image is badly degraded. I then try to retrace my footsteps and re-create the same image with the minimal of steps from the original NEF In my experience fiddling with an image for days ends up degrading it and making it muddy with a low IQ.
Sometime it take several attempts to minimise the steps to the clean image I know It can reveal. Then I wonder why I bothered!!! LOL But then I do enjoy the results in the end when I look back.
Too muchI am celebrating, I have got my gas cooker self ignition to work!!! Only take me three years to pluck up courage to pull the cooker apart and repair the switch! Yea, I can put my camping ignitor away!!!
My Sigma 10-24 is a version1 release of the lens and is exceptionally good for a zoom and shows very little hotspotting. In fact it is so negligible that a couple of passes with the burn tool gets rid of any effects (it is probably about +0.15EV or +0.1 EV in strength).
Glad that this IR talk has whetted you appetite Eric.
I am looking for a Fuji S3 Pro UV-IR body as I believe that they have the best solution if I want to also do UV. However I am not convinced that it will be better than my Nikon D70 IR converted when used for IR.
I blame my interest on Robert and our visit to Westonbirt when we discussed this and Robert showed me his D1 UV converted camera and lights. I really fancy having a go with the UV spectrum as we have so much more sunshine here in Spain also I have a UV torch I can use.
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Still learning after all these years!
https://nikondslr.uk/gallery_view.php?user=2&folderid=none