Taken with my Vixen R200SS during the same night than the image with the Tak Sky90 (both telescopes are mounted side by side on a Losmandy G-9).
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https://astrob.in/ld4eip/C/The slower speed of the R200SS(f/5.6 with the Extender PH vs. f/4.5 of the Sky90) would require 1.5x longer exposures to reach the same image brightness. Therefore this image is much darker compared to the Sky90 image. I now have the Corrector PH which should solve the problem, but of course the weather is bad ...
Finding the right background setting was difficult, because the whole field is filled with nebulosity. The Sky90 image helped to put the background reference points to the right place. A larger filed of view would be beneficial.
The bright stars shows some reflexes that look like searchlights (strongest on Alcyone) in the third quadrant between the spikes. This is probably a reflex from the focuser's drawtube that is protruding 5-10mm inside the the tube. Is was silvery anodised. I now blackend it to avoid the reflexes, but again bad weather does not allow to test it.
An finally, Barnard's Merope Nebula is covered by the spike.
Many points to revisit this object.
You comments are welcome. Stay well and CS
Ulli
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