the IR window of my qhy8l has scratches, one quite big... as you can see in the picture below. Also attached a flat frame
the scratch "shadow" is pretty big..
I've contacted qhy and they asked around 100€ (including shipping ) for sending the window (not just the glass...but the whole thing)
So I am looking for alternatives and wondering if someone has replaced it succesfully with a filter of other brand (and perhaps better...
at least in the sense of durability)
I usually image from home (bortle 7) and use Optolong L-pro, but with good weather coming, wanted to go to a darker site some times and
thus will remove the L-pro. Question is.. how much will affect to the overall image? Right now, even though the L-pro I assume it also cuts
the IR , the effect I see is on bright stars specially, even using flats. (like the example below, a crop from running man nebula )
Thanks in advance,