lucid wave
Hi everyone !
I’ve got an esprit 120ed, a zwo asi 294 mc pro. I have a 2’´ filter holder with an L-Extrem optolong.
I want to buy a good ir/cut filter (I have a 6/7 bortle sky).
Thickness of the filter have to be 2mm to avoid backfocus issue.
Some tips for me ??
Thanks a lot !
sharp cave
Hi everyone !
I’ve got an esprit 120ed, a zwo asi 294 mc pro. I have a 2’´ filt...
why does the thickness matter if you have a filter holder
timber creek
why does the thickness matter if you have a filter holder
It changes the backfocus
lucid wave
Yes, for a filter, you have to add the thickness divided by 3.
lucid wave
No ideas plz ??