I have been trying to find some information what exactly is the function of blocking filter, and how it is done.
Because if it's only to block some ir/uv it makes no sense, why it can't be replaced by set of suitable filters. So it has to be something more.
It all started with recent purchase of ZWO ASI 174 MM, which i'm very pleased with. Finally no artifacts, grid pattern etc. But, B600 blocking filter from Lunt does not cover entire sensor.
Obviously with quark, or regular imaging, let's say of the Moon, there is no problem with vignetting. So B600 is too small. Clear.
But, why do i need it for imaging anyway?
I was thinking, what if i replace it with regular diagonal, and try imaging this way? I'm afraid to try it, because it may fry the camera sensor 😆
I want to understand how it works, and what is the reason for it in visual use vs imaging. For me saying, that it's necessary part of h-a scope is not enough.
Can someone with such knowledge please explain it?