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Phillip Creed
Idiot Seeking Village
Reged: 07/25/06
Posts: 1005
Loc: NE Ohio
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For those that have been able to do a direct comparison between the 31mm Type 5 Nagler and the new Celestron 31mm Axiom LX, what are the differences, if any, in true field of view?
Looking at Televue's website, it appears the 31T5 has a 42mm field stop. But I'm guessing there's pincushion distortion, because (42)/(31)*180/pi = 77.6 deg, not 82-deg.
Thoughts from those that have compared these titanic eyepieces?
Clear Skies,
Phil
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"Why suffer from insanity when you can revel in it?"
Wilderness Center Astronomy Club member since 1995
ICQ Comet Observer Code: CRE01
*****
16" f/4.5 Truss Dobsonian
Orion 120mm ST Refractor
23mm Axiom LX
13mm Ethos (FOR SALE!)
13mm Nagler Type 6
9mm Nagler Type 6
1.75X Siebert Barlow
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Lamb0
professor emeritus
Reged: 07/25/07
Posts: 660
Loc: Fairbury, Nebraska
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 I haven't had a chance to use the 31 Axiom LX, and would be interested in learning the field stop diameter, whether the focal point is inside the eyepiece similar to the 31T5, and a direct head to head comparison with a Paracorr. You are correct about the pincussion in the 31T5 - it can be annoying while sweeping the sky, but I can easily ignore it as the stars are still sharp at the edge of the field. 
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polaristom
member
Reged: 12/17/07
Posts: 44
Loc: Alaska
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I have two eyepieces, the 31T5 and the 13E. I have never looked thru an Axiom, but I know the 31T5 is my favorite, even over the Ethos. No question.
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18" Starmaster
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