Thin crosshairs, low price, easy to get? How's the Orion? Any thoughts?
What makes for a good Cheshire eyepiece?
Started by SteveF, 12/02/2002 07:59PM
Posted 12/02/2002 07:59PM
Opening Post
Posted 12/05/2002 06:39AM
#2
My Cheshire doesn't have the crosshairs, and it works well - in fact, I can't see how it couldn't work well. (See the article in JAN 2003 issue of S&T, regarding it's accuracy versus a Laser Collimator's).
The cross hairs are certainly handy when aligning the secondary mirror, and saves you having to make up a cross hair sighting tube on the one or two times you need one.
But the cross hairs aren't needed for collimating the primary mirror in normal field usage. All you need to do is put the dark dot into the middle of the annulus, that's been stuck in the exact centre of the mirror.
Renato
The cross hairs are certainly handy when aligning the secondary mirror, and saves you having to make up a cross hair sighting tube on the one or two times you need one.
But the cross hairs aren't needed for collimating the primary mirror in normal field usage. All you need to do is put the dark dot into the middle of the annulus, that's been stuck in the exact centre of the mirror.
Renato
Funding Member
