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Well ZWO have just released a compact filter wheel for the ASI1600MM which is ASCOM controlled. They can lalso supply filters and it can all be purchased as a bundle. It uses 31mm filters and they are located close to the sensor so vignetting is not an issue. Other filter wheels like Starlight, and QHY, work fine but you need to consider how you attach or the adaptor used, and spacing distances. I use a QHY wheel with 36mm filters which negate any vignetting risks, and the 1600 screws directly onto the wheel housing. Filters can be expensive, but there are some good value ones available as bundled sets, narrowband and broadband purchased together will save you money. I like the Baader filters.
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