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If you get a doublet, prepare to get f/10 to f/12 at a minimum to control color. A triplet can be made faster with the same color correction.
I have an ES 102ED Triplet and the images are fantastic IN FOCUS. To test out-of-focus images, I use a #56 green filter because different colors defocus at different rates.
Intra- and extra-focal images are nearly identical.
I couldn't guarantee the one you get will be as good, but I'm keeping mine:
--dual speed 2" R&P focuser
--focuser suitable for visual and AP
--sliding dew shield
--push-pull collimatable cell
--good rings with carry handle connector
--standard Synta-style finder bracket shoe so many finders fit.
--comes standard with a 2" dielectric star diagonal with 2" to 1.25" adapter which is threaded for filters.
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