CPC1100 with F6.3 FR wont come to focus.
Posted 29 November 2012 - 11:02 PM
I feel stupid - I should have posted thi earlier, because I honestly cant remember what limit I was at, long or short, on the extender... I think it was short though, because I have extensions and remember thinking that wouldn't help.
So - What do you do in this circumstance? Is there a different telextender that works with the CPC1100?
Posted 30 November 2012 - 12:28 AM
The Celestron T-Adapter was made for this exact configuration, and with a T-Ring it puts the sensor in a DSLR at about 110mm from the middle of the reducer lens elements (which is the ideal spacing to achieve the full .63x reduction). The Meade unit is similar but has multiple spacers instead the solid body of the Celestron (hence the "variable" part). It shouldn't matter which one you use as long as you have about 50-60mm of spacing behind the reducer and infront of the DSLR (50mm T-adapter, 10mm T-ring, ~45mm depth in the DSLR, and ~5mm to the middle of the lens elements gives you the 110mm spacing).
If you have an appropriate setup (reducer close to the scope and 110mm of spacing back to the sensor) and it doesn't come to focus I would take a very close look at your scope, in particular the primary mirror and see if there is anything intruding into the rear cell (long bolts) that are preventing the mirror from moving through it's full focus travel.
Posted 30 November 2012 - 07:48 AM
Posted 30 November 2012 - 08:47 AM
Sorry - noooobie...
That makes sense though.
Posted 30 November 2012 - 12:44 PM