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This works pretty well. I stuck a mirrorless on the end of a 400mm lens and mounted a 2x and a 1.4x Extender - which (when coupled with the APS-C) crop factor of 1.61x... gave me just over 1,800mm zoom I can make out the rings and details of Saturn much more clearly than the Nikon P900 but this is partly because of the glass used and partly because of the larger sensor. The only reason I didn't buy a P900 is because the sensor is so small. They could have achieved a magnificent camera, if only they'd used a larger sensor on it. The latest generation Image Stabilizers Canon are using (on the more recent lenses) are so effective that I managed to capture a handheld color shot of the Orion Nebula with the 400mm unassisted lens, just by leaning with my back up against my car.
That said, the P900 is still an amazing piece of kit for the price. Has anyone tried it on the Orion Nebula because it's got to be able to get something at 2,000mm.