Quote:
Originally Posted by gregbradley
FSQ106N used to have that type of artefact. Bright stars long the edge of the image had a black bar going through them like a wormhole.
Roland Christen said it was vignetting. FSQ106ED does not do this.
I would have thought it fits the definition for astigmatism where a star forms a line towards the centre of the image or at 90 degrees to it.
Are your spacings spot on?
A full frame sensor is a big ask for a small scope. In my experience with Taks they needed a 4 inch focuser to be happy with full frame no matter what the brochure said.
Its very impressive overall.
Greg.
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Greg, if a 4” focuser is ideal for full frame, I’m way off it! The tiny Tak comes with nothing like that. If Roland says it’s vignetting, then that would definitely apply for this tiny tube setup. Re spacing, it’s bang on. Tak flattener to Tak #33 wide/Canon mount. 100% per Tak system chart.