Normally we would expect to see first light associated with a new camera or optical tube.
However I have just changed from the Optec IFW3 filter wheel to the FLI CFW-5-7. The difference is unexpected and dramatic. My calibration frames are now quite superb- I'm not seeing a single trace of dist bunnies or field vignetting. This is probably about as good as it is going to get and the bonus is that as the wheel carries 7 filters I now have the full LRGB and narrow band filters loaded in the one wheel- the previous wheel could only carry 6 filters.
Last night I was able to focus the telescope & adjust the focus of the guide camera. I was really careful to get the back focus at 147 mm. This is 146 mm for the Edge optics and 1 mm for the filter effects. I had previous problems with the blue filter and suspected that it was a focus issue where because the back focus was out on the previous build the blue may have been shifted somehow. The issue appears to be resolved by getting the back focus very precise allthough we never know if 146 mm is going to be exact for all Celestron C11 and C14 OTA's.
Last night was very hazy so I choose M13 to do my test and only needed a short number of subs to test flat frame calibration. The image presented consists of 10 30 second RGB subs each and 15 30 second L subs.
I'm really pleased with the result of the calibration- it is so much better than my earlier filter wheel and I look forward to great results moving forward.