Danpbphoto Offline Upload & Sell: On
|
James Markus wrote:
Dan, there is bit of a learning curve to IR.
#1-Autofocus is usually off - even if calibrated. Some services will calibrate for a particular lens. Therefore, manual focus is really the best way to go. Some MF lenses have a red dot near infinity focus to approximate where infinity is in the infrared spectrum. With my 5D I had to chimp for focus, and exposure, but once you have it nailed it works well. Otherwise, I would get a camera that has excellent live view with almost no lag to the rear screen
#2-some lenses are not good at IR. They generate "hot shots" usually in the middle of the frame, and worsen as you stop down. Almost all my Nikkor lenses work great at any f-stop, but I do have one that has stellar performance in the visible light spectrum, but makes hot spots in IR. A separate F-ring is a big plus for me.
#3-Generating a white balance profile is done a number of ways. I initially followed Robert Reiser's tutorial using Adobe's free DNG profile editor. There are some really wacky colors in IR, but I prefer the black and white profiles I created. However, you can approximate a 830nm profile easily in Photoshop. ctrl + U and desaturate completely. Find the D-max and D-min (brightest highlight, darkest shadow). Then ctrl + M click highlight eye dropper on D-min, repeat clicking the shadow eyedropper on D-max. If it removes too many gray levels use the fade adjustment.
Jim
...Show more →
Thanks for all the info Jim! Yes I realized it was lot more "involved" than just a filter. You, and others, make it look so easy IMHO..and I know it isn't.
My post processing skils are minimal at best but Adobe, and your advice, make it a bit more understandable Ps wise!
THANKS!
Dan
|