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Old 21-03-2018, 04:46 PM
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billdan (Bill)
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Join Date: Mar 2012
Location: Narangba, SE QLD
Posts: 1,346
The Orion Mini guide scope or a Skywatcher finder scope is 50mm f3.2 or 160mm focal length, a 2X barlow will extend that to 320mm focal length. Or a 1.5x will get you to 240mm focal length.

Last edited by billdan; 21-03-2018 at 04:59 PM.
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