[Ian Robinson]

I have decided on a Vixen Atlux with tripod.

I've seen claims of low single digit tracking error under tuned PEC when when polar aligned without autoguiding, which is pretty impressive and clinched it for me.

So since my biggest telephoto is 200mm fl using this with my trusty old Minolta XD5, and I am considering getting a 300mm fl lens with the Canon 40D then from another thread here :

200mm 6° 21’ 14" x 4° 14’ 17" with pixcel size 5.889" if I can get an adapter
300mm 4° 14’ 17" x 2° 49’ 34" with pixcel size 3.926" on a 40D

prime focus 1170mm 1° 5’ 13" x 0° 43’ 30" with pixcel size 1.007" on a 40D

If properly polar aligned as opposed to a rough polar alignment (two star computer alignment), will the Atlux better this once PEC has tuned the drive making autoguiding superfluous (and overkill in most cases) ?