can anyone recommend a good cheshire eyepiece?

Hi folks. Can anyone recommend a good cheshire eyepiece for fine tuning the collimation on my 18" Obsession? Are they all pretty much the same, or are some better than others? Does anyone make a 2" cheshire, or does it matter?

From what I've been reading lately, a cheshire is a complementary accessory to a barlowed laser, so I'm looking to purchase one.

Thanks.

Rex Cox

I use the 2 inch BlackCat from Catseye (Jim Fly), and have found it to be excellent for collimating my 10 inch AstroSky. It is best used with the triangle center mark (also from Catseye). The triangle is centered in the donut ring that you see in the BlackCat to get the primary perfectly aligned.

Catseye also offers 2 inch autocollimators and sight tubes.

Jeff Bennett

Rex
I'll second the Catseye equipment. However, I collimate by barlowed laser (Howie Glatter) then use the Catseye 2" Auto collimator to fine tune. Very quick and very accurate. Of course this is assuming your focuser and spider are set up in the first place.
Hope this helps
Buck