Quote:
Originally Posted by miki63au
Have you tried to optimise it by changing the spacers?
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These Synta refracters are air -spaced I would assume optimally. Even 30 years ago an F8 6" achromat would have been a rarity, becasue of its camparatively poor color correction. if you are used to Newtonians with good optics, a 6" achromat loses its appeal after the initial thrill of contrasty views of bright star clusters at low power with them wears off.
