S simonfilm Member Jun 17, 2011 #1 Canon EOS 7D with 18 mm, (18-55), 70 mm, 200 mm (Canon 70-200) and 1250 mm with Meade ETX 90 telescope. You can see the thermic turbulences. I say 2000 mm lens because the crop factor so 1.6 x 1250 = 2000 mm Last edited: Jun 18, 2011
Canon EOS 7D with 18 mm, (18-55), 70 mm, 200 mm (Canon 70-200) and 1250 mm with Meade ETX 90 telescope. You can see the thermic turbulences. I say 2000 mm lens because the crop factor so 1.6 x 1250 = 2000 mm
