Quote:
Originally Posted by AdamJL
Hi JA, thank you very much for your detailed response.
I'm using 36mm unmounted filters currently with two different brands of filter masks (3d printed).
I've tried the tape method on other filters without success. But good idea to shine light around. I'll do that next as well and see what happens.
With regards to black matte paper, can I use any type? I can pick some up today from a store and test as well.
Regards
Adam
|
I would simply use any black non-shiny paper - try officeworks or maybe black tape or black felt or black velvet. You would need so little black paper to treat the edge of
one filter as a trial. The object of the exercise being to see if that 1 narrowband edge treated filter displayed the reflective arc OR NOT in comparison with the other non- edge treated narrowband filters. That way you have a logical direction which rules in or rules out the filter edge as a possible concern.
BTW I just noticed that Antila in their literature say that they edge blacken their narrowband filters too. Are your narrowband filters blackened on the edges? It may make what I'm suggesting a moot point in that case, but it doesn't hurt to try.
In any event try to dull reflections inside your optical train completely at first and then in slective places/sections using the matt black paper in order to try to zero in on where the reflection is coming from. Then when you find it - fix it with matt paint. paper, tape or whatever.
Best
JA