|
Stupid question re; f/6.3 focal reducer on C8
OK - I've just bought a Meade Seriess 4000 f/6.3 F/R and have tried it out on my 8" C8 SCT this arvo pointing at the moon - both visually and photographically, and have not been able to reach focus or have suffered other problems.
Visually - I have the F/R screwed directly into the visual back. I then screw a Bintel SCT-style 2" Quartz Dielectric diagonal into the F/R as per the instructions. I then place a 26mm Plossl. At focus (on the moon) I actually get a crisp image - BUT I get an image of a black donut dead centre in the eyepiece, which is, I suspect, an image of the secondary!!!! I can't get rid of it and you can certainly see it plainly!
Photographically - I have the F/R screwed directly into the visual back. I then screw a Bintel SCT-2" adapter tube into which I set my 2" T-adapter. I can't reach focus at all. Nada in either direction of the total primary coarse focus travel.
Arrgghhh!! Is there a fundamental flaw in what I'm doing here?
|