c8 edge collimation problems

[iwols]

Hi all just trying to collimate my c8 edge with a 414ex ccd ,but i cant seem to get the image large enough to adjust collimation any advice please ,is it the 414ex is no good with the c8 for this?

[Alan64]

I don't know if this would apply to an "Edge HD", but here it is nonetheless...

 

[AstroAndy]

It should work, all you have to do is focus out (or in), until the star (I'd go to Meridian, and high up, maybe, as the seeing is better), until the star shows up as a circle with a hole in it, then hold a finger, or a screwdriver up in front of it, and where the ring is thinnest, that's the screw you want to start with (verly little turns). If the shadow of your finger (or tool), falls between 2 screws, adjust the one on the opposite side.