Cheap Celestron Hyperstar conversion.

[julian_1234]

Just doing my daily Youtube browse, and I came across a video of an astronomer using a field flattener as an alternative to a Hyperstar.

It needed an adaptor to be made, but the results shown at the end of the video appear to be quite good.

https://www.youtube.com/watch?v=CsOhAP8-tow

 

[davidc135]

I'd be suspicious of the video and doubt if the photos were taken with that setup. Removing the secondary will cause over 6 waves of under-correction that the Fastar is designed to compensate for, quite apart from the coma. 

It would be interesting to see what happens but I expect results would be a mess.

David

Edited April 30, 2023 by davidc135