thx Don .Don Pensack wrote: ↑Wed Mar 27, 2024 3:39 pm Zooms can be sharp, but they have very narrow fields of view in general.
The Leica Aspherical and the APM Super Zoom are two exceptions.
The Svbony 3-8mm Zoom also has a wider field than most.
Here is a page of Zoom measurements taken in a lab:
https://astro-talks.ru/forum/viewtopic. ... 83#p101290
yellow = exceptional image quality.
Blue = poor image quality
I'm looking to buy a zoom .
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Re: I'm looking to buy a zoom .
I LOVE REFRACTORS , 
REFRACTOR , TS-Optics Doublet SD-APO 125 mm f/7.8 . Lunt 80mm MT Ha Doublet Refractor .
EYEPIECES, Delos , Delite and 26mm Nagler t5 , 2 zoom Svbony 7-21 , Orion Premium Linear BinoViewer .
FILTER , Nebustar 2 tele vue . Apm solar wedge . contrast booster 2 inches .
Mounts , cg-4 motorized , eq6 pro belt drive .
“Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won't come in.”
― Isaac Asimov
Jean-Yves
REFRACTOR , TS-Optics Doublet SD-APO 125 mm f/7.8 . Lunt 80mm MT Ha Doublet Refractor .
EYEPIECES, Delos , Delite and 26mm Nagler t5 , 2 zoom Svbony 7-21 , Orion Premium Linear BinoViewer .
FILTER , Nebustar 2 tele vue . Apm solar wedge . contrast booster 2 inches .
Mounts , cg-4 motorized , eq6 pro belt drive .
“Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won't come in.”
― Isaac Asimov
Jean-Yves
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