[OzEclipse (Joe Cali)]

Originally Posted by Dbroz

Yeah, I’m so disappointed that I damaged the 3.1” that I had , I ended up getting the GSO 1/14 wave 88mm, I did see some from Antares they were 1/20 wave but about $300 more expensive, do you think it’s worth spending that money on a secondary 1/20 wave, I mean will there be a big difference between Antares and GSO secondary. If there is a noticeable difference then I may save up to upgrade later on.

With a secondary mirror sitting at 45 degrees, the wavefront error is amplified by the square root of two. So in theory, a 1/14 wave flat will yield a 1/10 wavefront error in actual use and a 1/20 wave will yield a 1/14 wave in use.

I wouldn't use a diagonal with > 1/10 wavefront error. My feeling is you won't notice the difference between 1/14 and 1/20 wave.

Joe