Collimating with a Focal Reducer

supernova1965 (Warren) · #1 18-04-2011, 06:29 PM

Hi all,

Question about collimating a scope that has a Focal reducer with it in the GSO collimator's laser beam is diffuse into a spotty oval. I first collimated it with the Focal reducer removed and it worked great but when I put the reducer back in after collimating the laser light was off center. But looking through the focuser it looked spot on still with my eye lined up with the center mark on the primary

gb_astro · #2 19-04-2011, 07:38 PM

Hi Warren.

Why are you trying to collimate with the focal reducer in the scope?

gb.

supernova1965 (Warren) · #3 19-04-2011, 07:53 PM

Quote:

Originally Posted by gb_astro

Hi Warren.

Why are you trying to collimate with the focal reducer in the scope?

gb.

I am still a NOOB with a lot of this stuff

The scope is one designed with it in and I didn't know if you collimate with the reducer out or in. I only just got the collimator and had no idea if I had done it right. I got first light tonight as the cloud went away

and it was perfect so obviously you have to take it out when collimating.

gb_astro · #4 20-04-2011, 10:15 AM

Yes, leave it out during collimation.

gb.