How Tight ?

[vindictive666 (John)]

hello all


i was wondering on how tight is tight enough on the primary mirror locking screws?

is finger tight good enough ?

found out the hard way too tight wid a screw driver upsets the collimation

thanks

[iceman (Mike)]

I don't bother with my collimation locking screws, most of the time. Even finger tight can upset collimation.

I just check collimation almost every time I observe and make sure it hasn't moved.

[slice of heaven]

See if you can find some heavier springs to support the mirror cell Vin. 3 screws are enough to play with let alone 6.

[rmcpb (Rob)]

I agree, basically I ignore the locking screws (should really take them out) and give the scope a quick check each time I use it. The screws and springs are just fine for my scope but its "only" and 8" so I can't vouch for the effectiveness of this method for the larger ones.

Cheers

[ving (David)]

i do finger tight for each then a 1/4 turn making sure to do each the same amount... works for me

[Starkler (Geoff)]

I do it this way :

Adjust the three larger collimation screws and then very lightly seat the locking screws against the metal plate. If you then gradually tighten each lock screw in turn a little at a time working around in a circle, checking collimation as you go, you'll find that you can get it right and have it stay there.