Re: [M]: Zoom vs Fixed Eyepiece!
| Subject: | Re: [M]: Zoom vs Fixed Eyepiece! |
| From: | Bill Arnett |
| Date: | Tue Mar 23 01:55:45 1999 |
At 7:00 PM -0700 3/22/99, Chris Vedeler wrote:
>I won a Celestron zoom eyepiece as a door prize one time. I tried it out a
>few times, but was not all that happy with it so I traded it at a star
>party for a used 2" Lumicon Deepsky filter. The problem with it was that
>the net field of view didnt change that much as I zoomed. What I mean by
>this is that at 8 mm or whatever, the apparent field was like 60 degrees,
>but when I zoomed all the way out to 20 mm the apparent field shrunk down
>to something like 40 degrees. It was almost as if the zoom action wasnt
>giving me more actual field, it was only making the same field larger or
>smaller.
My Vixen zoom doesnt have that problem. The apparent FOV does
shrink a little as you zoom out but not by much and you definitely
get a wider actual FOV.
Bill Arnett
http://www.seds.org/billa/
Emerald Hills, CA 37N 122W mailto:billa@znet.com
"I know that I am mortal and the creature of a day; but when I search
out the massed wheeling circles of the stars, my feet no longer touch
the earth, but, side by side with Zeus himself, I take my fill of
ambrosia, the food of the gods." -- Claudius Ptolemaeus (Ptolemy)
>I won a Celestron zoom eyepiece as a door prize one time. I tried it out a
>few times, but was not all that happy with it so I traded it at a star
>party for a used 2" Lumicon Deepsky filter. The problem with it was that
>the net field of view didnt change that much as I zoomed. What I mean by
>this is that at 8 mm or whatever, the apparent field was like 60 degrees,
>but when I zoomed all the way out to 20 mm the apparent field shrunk down
>to something like 40 degrees. It was almost as if the zoom action wasnt
>giving me more actual field, it was only making the same field larger or
>smaller.
My Vixen zoom doesnt have that problem. The apparent FOV does
shrink a little as you zoom out but not by much and you definitely
get a wider actual FOV.
Bill Arnett
http://www.seds.org/billa/
Emerald Hills, CA 37N 122W mailto:billa@znet.com
"I know that I am mortal and the creature of a day; but when I search
out the massed wheeling circles of the stars, my feet no longer touch
the earth, but, side by side with Zeus himself, I take my fill of
ambrosia, the food of the gods." -- Claudius Ptolemaeus (Ptolemy)
