Collimation

[acc]

CC, the thing is, no matter which aircraft warning light you choose, when they are under high mag, I don't think they will be a point source anymore.

So I am not sure if you can use that. You really need a point that even under 200X (for an 8" SCT) , it is still a point.

Heh Vin, u are right, you won't actually see the light as a point source under high mag... but when defocused, you should still get round concentric rings. Worth a try

cheers
cc

[weixing]

Hi,

Heh Vin, u are right, you won't actually see the light as a point source under high mag... but when defocused, you should still get round concentric rings. Worth a try

You'll get the ring (I try it before), but a very "thick" ring... hee hee =P =P =P

Anyway, I think still can use for collimation, but not for checking the quality of your optics.

Have a nice day.

[kayheem]

I agree with Vin. The light is not a good idea as it does not appear as a point source. Seeing thick concentric rings is only good for rough collimation.

Ideally, you should do a rough collimation at low power to get the rings concentric then do a fine collimation at focus at high pwer. It is important to keep the point source in the centre of the field at all times.

Kay Heem

[acc]

Aiyo... thick rings or thin rings, as long as they are concentric, then the scope is collimated, right? Furthermore whether they are thick or thin shouldn't affect your ability to gauge concentricity..

cheers
cc