Kson clone 4” f/6 ED (used) vs Astro Tech 102ED (used or new)
A little background info.
I currently have two different 4” APOs - Starwave 102ED f/11 and Vixen 102F f/8.8.
Both are excellent but have longer tubes.
Looking for a light weight shorter focal length (smaller momentum arm) 4” ED with Vixen style mounting plate to use on one side on a dual setup with a William Optics EZ Touch mount (Deepsky use only - max 100X to 125X)
Very little info on the Kson 4” f/6 with 2” Crayford focuser/sliding dewshield (discontinued ~ 2013)
Reviews say some CA but more noticeable over 100X.
The current Astro Tech with sliding dewshield + 2” excellent rack and pinion focuser - excellent optical and mechanical reviews.
Cost wise the Kson would be about half the cost of a new AT 102 ED.
Which would you choose ?