[Hoges (John)]

I've never had a problem with my Denkmeier's, until I bought some recent Baader Hyperions - their optical or mechanical paths are slightly different. Took me a little while to figure out what was going on, but when I started rotating the eyepiece in the holder, the image moved around enough to throw it out of collimation. This happened on a pair of 10mm's and 21mm's. I rotated the eyepieces till I got a satisfactory result and then put some small dots with a paint marker on them for reference. Most can get away with a little horizontal convergence (ie: going slightly crosseyed) but any horizontal or vertical divergence will give you headache real fast even if you can merge the images.


Also, I have noticed that even if I collimate by lining up a distant object against an edge of the field of view, I get a different result if I back off a 8" or so from the eyepieces while looking at, say a distant telegraph pole or tree/rock/farm shed - you can't see the whole field of view, but you can instantly tell if the images are still merged. When doing this, I'll relax or close my eyes and when open them, note how long it takes to merge the image. I think I trust this method more than lining up stuff on the edge of the field of view in both eyepieces with eyes in the normal position. I would have thought if you did it one way, it would be correct when doing the other but it's often not.....parallax error? Dunno, but it's worth experimenting with.