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Here is a section of a recent image I took with no reducer or extender. The image scale is about 1.1 arc seconds per pixel. If I added an extender, I would be magnifying this fuzzy image. I would question if you went too far beyond 1 arc sec/pixel. That's one problem.
Second problem - my auto guiding needs to be better.
Third problem - the field of view is reduced. Imagine if you only had one lens for your SLR and it was 500mm. It would start to get frustrating when you want to take a picture of a nice landscape. Rosette nebula / Andromeda Galaxy - these things are huge and need a short focal length. If you are imaging a tiny planetary nebula or planet then there is a case for it. In my situation, these cases are rare and widefield is the way to go. The wider the better!!
James
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