My low power eyepiece is a TV 32mm Plossl. I recently bought an ETX-125 to use when I just didn't feel like lugging out my Meade 8" f/6 (fl 1220mm) reflector.
One thing I noticed is that in the ETX (f/15, fl 1900mm), I get a pronounced kidney-bean effect with the 32mm. It's difficult to find the center spot in which all of the FOV is visible.
Why is the difference between my two scopes so pronounced?
I remember trying out a 40mm Plossl on my reflector and found at that low magnification the . . . image (for lack of a better term) of the secondary became noticable and I opted to stay with the 32mm. Is something similar going on here?
"Kidney-bean" effect in ETX-125
Started by
Michael Rapp
, Jul 11 2004 04:52 PM
No replies to this topic
#1
Michael Rapp
-
-
topic starter
- Posts: 4,332
- Joined: 26 Apr 2004
Skylab
Posted 11 July 2004 - 04:52 PM
CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.
Recent Topics
-
-
-
-
-
-
Using ZWO CAA for Lunar or solar imaging. Any experiences ?
olivier-974 - Today, 08:47 AM
Lunar Observing and Imaging
-
-
-
-
