Thursday, October 07, 2010

H and SR

Trying to figure out what the letters mean on the Firstscope H20mm and SR4mm eyepieces. Found some "opinions" over at Astronomy magazine's forums...

H might mean Huygens or Huyghenian.

SR? Symmetrical Ramsden? Confirmed the 35° AFOV. Also learned that it has 2mm eye relief!


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