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Old 05-10-2019, 05:09 PM
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Wavytone is offline
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
Well, 9mm gives 300X or so and for a refractor...

You could buy a cheap 6” achromatic but that won’t be much good past 100X, you do need premium glass such as an ED doublet something like this...

But bear in mind this no lightweight and will need a mount - at the minimum an AZEQ6 or G-11. The downside is it’s not much good for DSOs as the aperture is small. The fun begins at 200mm (eg a C8).

Alternative along focal length Newtonian(dobsonian), or a schiefspiegler (you will have to build that)... or a 9” maksutov like my MK91 and these are very rare.
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