Quote:
Originally Posted by Merlin66
Glenn,
I've been at this game for over fifty years.....
My "declining years" telescope for performance and portability will definitely be the original Genesis 4" f5. (Serial 1007)
I haven't found anything to beat it over years.
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Ken according to my research the TV Genisis 4" f5 is in fact an achro doublet design, albeit with a rear Petzval corrector. Yes it may have nice glass up front but it will still have colour issues. I have been using a Bresser 152mm f5 with a Petzval corrector in the rear, for narrowband imaging but it is unsuitable for broadband.