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Geoff,
You can certainly use these for photography but there "can" be issues using a newtonian that is not optimised for photography for that purpose. The main issue is that you need to push the focal plane out by an inch or two to strike the chip or film. When you see people using large aperture newts for photography these are usually optimised as photographic telescopes or at least compromised in this regard with the secondary positioned slighly closer to the primary and an oversized secondary used to push the focal plane further away from the side of the tube and to provide a larger Fully Illuminated Field than would normally be the case for visual use. That scope however should do well as an entry into astrophotography if you can get it to reach focus on the chip or CCD or whatever device you plan to use. Collimating the primary as high in the tube as possible would possibly help here.
CS-John B
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