Apertura 20mm Spacer Ring for M48 Thread
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Will K. Verified Buyer –
I used this in combination with the Apertura 2″ Photo & Visual Coma Corrector for Newtonian Telescopes. I used this Spacer to push back the focus so that I could use a 31mm 82 degree eyepiece on a Apertura AD8 Dobsonian F/6. The field was flat and coma free.