Light ingress through newtonian's back?!

[uhb1966]

While doing darks, i realized one of the darks was a bright white. i was rummaging behind my newtonian w/ my headlamp on. Looks like light can pass thru the gap around the mirror?! What is the best way to avoid that?!

Best, U.

[andrew s]

Cover the back ( and front) or take your darks in the dark.

Regards Andrew 

[alacant]

Hi

Easiest -and maybe best- a black shower cap.

HTH

Edited June 19, 2020 by alacant
foto

[uhb1966]

@alacantGreat idea  

@andrew s but who ever thought of covering the back end?! Not me😬

 

Edited June 18, 2020 by uhb1966

[andrew s]

13 minutes ago, uhb1966 said:

@alacantGreat idea  

@andrew s but who ever thought of covering the back end?! Not me😬

 

If it can light will leak in anywhere there is a gap or opening.

Regards Andrew 

[Grimbles]

I had the same issue with a 150 PDS, a cut down black bin liner and a piece of bungy cord sorted not just the darks and flats but improved the contrast in the light frames.

[uhb1966]

On 19/06/2020 at 10:02, Grimbles said:

I had the same issue with a 150 PDS, a cut down black bin liner and a piece of bungy cord sorted not just the darks and flats but improved the contrast in the light frames.

@GrimblesI'll try that, thanks !