What is the deal with Optima & ZBW glass?

[Andy Perrin]

Bernard et al. - I made a new thread with the three filter test using the ones I have lying around. I have a 905nm filter also, I realized afterwards, so I may redo it with that one instead of the 830nm to more evenly distribute the filters over the range.

https://www.ultravioletphotography.com/content/index.php/topic/3661-infrared-3-band-color-images-780-830-1064-nm/

[dabateman]

Bernard,

Then you may just try a UG1 2mm with longpass filter to isolate the 700-800nm band. Its weak though at roughly 25%, but camera will be most sensitive here.

Then your 800 filter you found.

Then a lp 950nm or RG1000 cwould work for high end.

That should keep them large and cheap.

 

Sadly though, I think you will not see much color.

 

I am also not familiar with an animal with IR color photoreceptors. The king of vision, the mantis shrimp also doesn't have any IR receptors.

[bvf]

Going over to Andy's new thread now to continue the discussion ...