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I’ve used GSO mirrors ( 6” to 12” ) in both metal and carbon fibre OTA’s for nearly 10 years now ( both visual and imaging ) and don’t have an issue with them at focal ratios between f6 down to f4.9.
At f4 and faster I always recommend folk investing in premium higher end scopes. The budget Skywatcher , Saxon , GSO etc…. just don’t cut it with fast optics. They use the same design engineering and hardware in f6 as they do for f4 which is ridiculous. Every year we have folk struggling with various issues on this forum with f4 budget scopes both visual and imaging. Some have reasonable success resolving their issues , some put up with the problems and some give up.
My 2 cents ……,
Clear Skies
Martin
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