3.3 Focal Reducer

[mick pinner]

has anyone tried the 3.3 f/r on a LX200 with a DSLR, and what success or lack off did you have.

[acropolite]

From what I have read the f3.3 adapter is for small chip use and will cause severe vignetting on a DSLR.

[mick pinner]

thanks Phil.

[[1ponders]]

Definately not the FR you want to use with a DSLR. It is designed for using with the DSI and it's small chip. Anything over about 1/2 inch diagonal will probably show vignetting or distortion around the edges.

[rogerg]

I don't use my F/3.3 much even with my ST7 because of distortion & vinyetting. Definitely not recommended for a larger chip than that of a ST7/webcam.

My situation is perhaps worse than the norm becuase I havea focuser in the mix, moving the focal reducer further from the mirror and exadurating the problems.

[sculptor]

The Celestron F6.7 reducer causes severe vignetting with my 22mm chip and Crayford focuser. It was bad on the Celestron 9.25", but horrendous on the 11". If I want wide flat field I put the camera on the ED80 600mm F6.7 guidescope. That gives about 3 deg field. If I want more exposure, I just do a bigger stack. Cheaper, too!