2" focuser on a starblast

on a starblast?
Would the secondary mirror configuration make it worth it?

doug

I don't know about the mirror, download Newt and decide for yourself.

I see a couple of problems with putting a 2 inch focuser on a Starblast.

1. Exit pupil. At F4 anything over 28mm will produce an exit pupil of greater than 7mm.

2. Coma, eyepiece aberrations. In an F4 scope, it takes some pretty fancy/expensive eyepieces to produce decent widefield views. 2 inch eyepieces at F4 means you will either be dealing with some pretty rough looking images or spending lots of money on eyepieces. Most F4 Newtonians are married to a Paracorr for this reason.

I have a 130mm F5 SpaceProbe 130 Newtonian that someone pasted a 2 inch focuser on. It does a pretty nice job but a nicer job with a Paracorr.

If you have the eyepieces and a Paracorr, it would be an interesting experiment, otherwise I think leaving it as it is and using it with a decent 24mm WF eyepiece is your best bet.

jon