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Hang on, it depends upon the telescope! An 8" Refractor is a big momma, but an 8" Reflector is average. So:
Reflector S Refractor S
3", 4", 5" 6" 40mm 50mm 60mm 70mm 80mm
Reflector M Refractor M
8" 10" 12" 90mm 100mm 120mm
Reflector L Refractor L
14" 16" 150mm 180mm 200mm
Reflector XL Refractor XL
20" 22" 220mm
Reflector XXL Refractor XXL
24" and up 250mm and up
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