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Alternatively, had considered getting a 10in newtonian
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Just remember that the image scale will be much smaller with a 10" newt, as if you get a mass produced one the FL will be about 1250mm. Obviously if you get a custom made mirror like bird, you can ask for a slightly longer FL but of course then you need a longer tube to put it in which can mean transport and/or mount problems.
I can't see how a C925 would be better than your mewlon, but if you have the option of having both for a period, it would be a great comparison to see the images you produce out of both - assuming all other things equal (good collimation, equal settings, equal seeing etc).