200PDS light leakage

[PaulR1]

Hey folks

This has been annoying me for a while now but there is light leakage around the primary mirror on my 200 PDS any suggestions / ideas to stop this ?

Ta !

[bottletopburly]

 Black Shower cap ?

[Peakedge]

I had this problem and went around the gap between the mirror and tube with black insulation tape. Latest solution was that I made a foam cap to slot over the end. I also tried a good quality black bin bag. Never thought of a..........

11 minutes ago, bottletopburly said:

 Black Shower cap ?

Was only a problem if I was taking darks or flats during the day.

Easy to solve but guess its more annoying than anything.

[PaulR1]

ok will hunt down a black shower cap lol

thanks

[discardedastro]

I had this exact problem and I had an online laser cutting company cut me a rear cover which is held in place by the small collimation locking screws - they don't seem to do much good anyway and I've not missed them. You can still adjust the primary collimation knobs, though it's easier to get a firm grip by taking the plate off first - only takes a minute.

I used https://www.ponoko.com and I've attached the file I sent in. I've not had any worries about light leakage around the primary since. Cost about £10 I think.

The before and after in daylight:

tubecap.svg

Edited February 20, 2020 by discardedastro