[Stefan Buda]

Looking at what is available on the market, it seems that would be lunar and planetary imagers are a bit neglected.
There is an amazing range of wide field and deep space astrographs to choose from, but when it comes to planetary, there are very few suitable instruments.
Basically one has to choose between a large Newt or a large SCT.
The large SCTs are proven performers when it comes to planetary imaging, but the optical quality seems to vary and that can be a big problem. Also it is hard to keep the corrector plate from dewing up, just when the seeing comes together. Heaters, while ok for deep sky, are out for sub arc second imaging.
Large Newts are a bit cumbersome and need to be optimized for planetary imaging to perform well, by minimising the size of the secondary, having a primary mirror that is not too thick and providing forced ventilation for the OTA. Of course, the optics need to be really good as well.
There is a third possible option for the planetary imager, but it is not well supported by the market, and that is the Dall-Kirham.
Recently I started designing a dedicated planetary 250mm aperture DK to complement my CDK250 and I would be very interested to hear from people that are intending to try lunar and planetary imaging or even just visual planetary observing.