Can these Filters be used for Astronomy ... or .... are they strictly for Photographic use.
These are Premium 48mm Filters..... ( Made in Germany )
Please watch video to see how they are made .... clearly ' top shelf ' stuff.
https://schneiderkreuznach.com/en/ph...rs/filtertypes .... goes for 1min 20 sec'
and Listings here .....
https://www.bhphotovideo.com/c/brows...1/N/4026728367
Why am I asking .... I have 3 of these ( 48mm ) Filters ... Mint Condition.
1....is Green .... another is Blue ..and the other one is Red.
I am going to list these for sale ...I have no use for them.
Col....