Quote:
Originally Posted by doppler
I have a 8" f6 newtonian and had to move the primary mirror forward to get prime focus, but then found that some eyepieces would not focus for visual.
A 2x barlow lens and t mount worked on mine without moving the primary mirror, ok for imaging the moon and planets but it doubles the f ratio and a bit slow for deep sky imaging.
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Cheers, I might have to try the barlow. I don't think I tried it last time!
EDIT: Could you explain where your barlow was placed compared to the rest of the optical train? I know you can put it in a few places. Sorry I am still reasonably new to this! Your help is appreciated.