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depends on the camera Lewis. If you have small pixels, 800mm fl will give OK pixel scale, but it is not suitable (for galaxies) with large pixels. The 100mm aperture is small enough that it will slightly degrade the resolution in very good seeing and CA will probably also limit the resolution a bit.
at f8 and with small pixels, the system will be fairly insensitive and that will mean extended imaging times.
As Rick suggested, you should still be able to get good images of the bigger, brighter galaxies in acceptable time.
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