Coma,when does it stop?

[estwing]

Does anyone know when this isn't present in the full field of view?,in my scope the paracorr seems to completly clear it up.At what point does the correcter not clear the entire view?F3.5,F3.8..?

[andrew s]

Look at the Tel Vue website it has a graph of its performance which h should help. It is a download.

Regards Andrew

[Paul73]

Paracorr I or II?

The Mk I works fine in my comparatively fast scope with 82° Fov eyepieces. Haven't heared any complaints from owners of much faster scopes. Presumably the Mk II clears up more on the 100°+ offerings?

Please excuse my ignorance in this field. Just interested to know.

Paul

[faulksy]

this could be interesting to read

[Paul73]

Paracorr I or II?

The Mk I works fine in my comparatively fast scope with 82° Fov eyepieces. Haven't heared any complaints from owners of much faster scopes. Presumably the Mk II clears up more on the 100°+ offerings?

Please excuse my ignorance in this field. Just interested to know.

Paul

Sorry. I meant "comparitively SLOW scope". Only f4.7.

Pau

[estwing]

There's picture of a webster 28" and that is F2.7!! Even with correction only so much of the view will be free?

[John]

The Big Paracorr seems to work down to F/3:

http://www.televue.com/engine/TV3b_page.asp?id=61&Tab=_phot3#.VRle3Y47e7Q

Just £950

.....and you need a 3" focuser.

Still, a 20"+ F/3ish dob is not going to be a low cost project.