V
Vivek
Guest
I am looking to collect information on lenses that give "hotspots" while shooting in infrared. Among the lenses I use, I know which ones do this and which do not. I am not looking for a lens list but the possible contributing factor(s)
There are theories on lens' coatings affecting their IR performance, particularly when it comes to "hotspots".
Are there any other reasons/possibilities that contribute to this? Your thoughts, please.
Sigma 30/1.4 @ f/1.4, D200-IR, ISO640
The Sigma 30/1.4 shows no image degradation at all from f/1.4 to f/8. After that (when stopped down) things get mushy.
There are theories on lens' coatings affecting their IR performance, particularly when it comes to "hotspots".
Are there any other reasons/possibilities that contribute to this? Your thoughts, please.
Sigma 30/1.4 @ f/1.4, D200-IR, ISO640
The Sigma 30/1.4 shows no image degradation at all from f/1.4 to f/8. After that (when stopped down) things get mushy.