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I have a CDK17. I have only used it visually at home which is semi rural skies. It was hopeless. So affected by the seeing it was not sharp at all.
But I imagine at a dark site allowed to thermally equalise it could be very good as it can do some very sharp imaging.
I have also used:
AP140
FSQ106
FS102
FS152
TEC180
TEC110.
The FS152 gave the most astounding views. A nice doublet does not take long to cool off. Fluorite is great for visual.
A 4 inch APO is too dim really for my taste. The TEC180 was quite good as well but the FS152 is more memorable. Perhaps I just used it more often for visual. Coupled with a Nagler 24mm it was magic.
I have looked through some large dobs and they definitely can show the dimmer objects very well. I also liked my Celestron 11. But the FS152 was the best.
Greg.
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