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collamination question

Started by kb4mxo, 05/15/2003 06:58PM
Posted 05/15/2003 06:58PM Opening Post
Hi I have a few questions on collamination using the laser test.The first thing I noticed I had to align the laser. I would like to thank the group for talking about that problem.Mine was OK but when I changed the batteries it changed they must not have tightened the screws tight.I put some finger nail polish on each screw to help hold it in place on the laser.I have a 8 inch starfinder and picked it up used and I think I picked it up from him is it was way out of collamination. I marked both mirrors center and then leveled the cell. I really did it different than the web site because it didn't work for me. The first thing was to align the secondary so the red laser light hit the center of the main mirror. My understanding is the beam should bounce back to the point that came from in the eye piece. Is this true? If this is true how do you know it has hit that point. My laser has no feature to see that. The way I did it was punched a 1/4 inch hole in a piece of paper and ran the rack on the focuser all the way up and put the paper under it so the laser light went into the hole in the paper and adjusted the collimation screws on the cell until the returning beam didn't hit the paper and thru the 1/4 inch hole. This worked OK for my focuser that had a gap but how do others that have no gap do it? I plan on checking how close it is using the star test tonight. I would be very greatfull of any help.

Thanks

Steve