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Old 05-10-2019, 04:09 PM
Wavytone
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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...
http://apm-telescopes-englisch.shopg...m/333631363633

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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