You may have this focuser issue in your dobsonian newtonian reflector telescope - (solved)

[Tiago Ferreira]

I found an issue in my 2" low profile double speed focuser which allow light intrusion (leaks) and affects mainly imaging (astrophotography or EAA) but also visual observations through an eyepiece. This is an issue that exists in different focusers. In this video i show it and work on an effective and permanent solution for that. This leaks are hard to detect because they may happen mixed with other issues like vignetting or amp glow and also can be confused with them. This leaks are more evidenced during moon nights and/or other light sources.

 

https://www.youtube.com/watch?v=MY9y6R_i29c