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Very long focal length refractors
I came across an interesting article yesterday that said that although modern triplets are perfectly optimised for imaging, visually they are flawed compared to the very high focal ratios of old when it comes to viewing the bright planets in particular. I’m talking about those old 80 -100mm fluorite f/12 or even f/15+ refractors.
Has anyone compared them to modern fast APOs? Does anyone close to Brisbane have one? I’d love to look through one.
Last edited by OneCosmos; 04-10-2020 at 07:48 AM.
Reason: Grammar
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