Quote:
Originally Posted by multiweb
I have a corrector for my refractor that works well at 119mm from sensor. I have a Baader FFC that I'd like to use in the imaging train. The FFC magnification is proportional to the spacing between the glass and the CCD. Do I:
1_ place the FFC at the native focal point of the refactor then have the corrector then the CCD at 119mm?
or
2_ place the corrector up the tube 119mm ahead of the FFC glass and then the CCD can be spaced as usual to get the required magnification.
In #1 I can't get magnification smaller than x4. With #2 I'd still be able to go down to x3.
TIA.  |
I would think that option 2 would be the preferred setup. I have a Baader FFC and plan to use it on an f/12 refractor once I have the correct extension tubes which are hard to source. Is your corrector just that, a corrector or does it have a reducer/extender function as well? Still, I think any correction device should be placed ahead of the FFC....trial and error will reveal the correct option.