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!
Yuk.
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Observation notes (with equipment details), photos, sketches, reviews, software tips, random thoughts, by an amateur astronomer.
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