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7mm Nagler

Started by hakescl, 02/27/2003 07:51PM
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Posted 02/27/2003 07:51PM Opening Post
Charles Hakes
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Join Date: Jun 2001

Location: Durango CO, US

Posts: 690

I still see lots of adds for the old style 7mm Nagler eyepiece and they are much cheaper than the newer type 6 ones. What is the performance difference? Eye relief? Sharpness? Size? I have the 4.8mm. How do they compare?

Thanks,
Charlie
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Fort Lewis Observatory: (37.238, -108.052) ~2360m (7744 ft.) elevation.
Darkness - typically 6.5+
Scope - Meade 16" LX200; f6.3 focal reducer
Focus - JMI Smart focus
Camera - SBIG ST-10XE; (~.5"/pixel)
Guiding - AO-8 and/or Meade 5"/DSI/PHD
http://www.fortlewis.edu/observatory
Posted 02/28/2003 12:08AM #1
Lorne Johnson
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Join Date: Feb 2002

Location: Putney VT, US

Posts: 232

The 7 mm has cosiderably more eye relief and a larger eye lense, making it noticably more comfortable to use. I happen to have two f/6 scopes that work out to about 160x respectively with the 7 and 4.8. Optically they seem very similar, and very good.
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