Quote:
Originally Posted by Martin Pugh
Hi all...and thanks again for the comments.
Shawn...no dodge and burn tools used in this image.
Greg.....have made some progress.....and even sent the FSQ back to Japan for collimatiion (at great cost)....still not there, and are waiting on a new design CFW from FLI
I believe the Filter carousel itself is causing major tilt in the system giving rise to star elongation and distortion....I am presently doing repeated tests with CCDI and trying to determine if focusser sag is at play also. However, there is only about 8-10mm of drawtube showing. Its a long arduous road...whoever thinks you can plug n play in this game is mistaken.
cheers
Martin
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Egads, recollimating an FSQ - never heard of that before. Wow.
I have both a FLI CFW 4/5 and an Apogee FW50 filter wheel.
The FLI unit is nice but the Apogee is absolutely state of the art. It has CNC machined ribs in the back of the main front plate which would be really helpful to prevent any flexure, the filter holders will accomodate various thickness filters which no other filter wheel does, and it has a unique click in position setup when the filter arrives at its spot. It also changes filters very quickly. But the main point here is the ribbed front plate which eliminates flexure.
Something to keep in mind if you have no joy with your FLI CFW.
I have also seen stars slightly elongated in one section of an image and put it down to slight flexure in the various adapters. I have simplified my adapter train so hopefully this is reduced. It wasn't too much of a problem but it was there. Also my camera was not at its correct metal back distance from the corrector. Next time it is out I will find out if there is any change. These new cameras are heavy and the Proline is the heaviest of all so it does put a strain on these bits and pieces.
Richard Crisp made an interesting post about these large chips require 4-5X more orthogonality than an STL11. One of the prices of large chipped cameras.
Greg.