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abutu
sage
Reged: 03/09/07
Posts: 312
Loc: Gijón (Asturias) - SPAIN
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Hello:
Please, I would like to know how is your experiences with this combo, specially when using ultra wide angle eyepieces like Naglers and Ethos, any coma or vignetting issues?
Thanks a lot,
Alex
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Joe Ogiba
Post Laureate
Reged: 02/14/02
Posts: 3340
Loc: NJ USA
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Alex, my 13mm Ethos works great on my C9.25 with Celestron F6.3 FR/FF with no coma or vignetting . I use a 45° correct image diagonal in the daytime and SCT diagonal for astro use. I also use a pair of 13mm Ethos with my Denk II in .66 focal reducer mode that also works great.
Joe
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Pentax PF-80ED
Meade 102ED APO
Orion EON 72
120ST
Apex 127
C6 XLT
CR150
C9.25
XT10
Zeiss 7x42 FL
Canon 10x42L IS WP
15x50 IS
12x36 IS II
Garrett Optical 28x110 HD-WP Signature Series
Oberwerk BT-80 45
Apogee RA-88-SA
Denk II Power x Switch binoviewer w/13mm Ethos, 20mm Pentax XW's, 20mm Widescan III's.
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 6760
Loc: Beatrice, Nebraska
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Quote:
Hello:
Please, I would like to know how is your experiences with this combo, specially when using ultra wide angle eyepieces like Naglers and Ethos, any coma or vignetting issues?
Thanks a lot,
Alex
It works fairly well on 1.25" barrel eyepieces, giving just a hair over one full degree of field with a 27mm field stop eyepiece. However, with some star diagonals, 2" eyepieces may not come to focus with the focal reducer in the scope. At high power, the Celestron focal reducer/corrector introduces a very small amount of chromatic aberration in the form of mild lateral color to bright objects, so I don't use the reducer routinely. I get the same or better low power performance with my longer focal length 2" eyepieces (30mm WideScan III and 40mm Mk-70 Konig). Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
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Nick Lloyd
Carpal Tunnel
Reged: 10/24/06
Posts: 1624
Loc: cincinnati
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Is that the Giro II mount?
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"The best scope is the one you use." -rcg
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