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I don't quite get what you mean. Do you want to use two different type scopes on a mount so that you can look at an object while photographing in the same area.
or
just use a single mount to do different things without having to set up a second scope.
If your mount is robust enough two scopes say an 8/10" newtonian or a 8/10" SCT for narrow field with a piggy back ED80 is a very common arrangement amongst the photographers allowing photography and guiding from either. or just visual observation. The most common trouble with this arrangement is differential flexure when guiding with one and photographing in the other. In fact many often have a wide angle DSLR as a third image source.
If you want to do visual with one while photographing with the other you will have trouble keeping the assembly stable enough for photography.
If you have some money invest in the best mount you can. At minimum an EQ6 but a G11 would be better. Suitable scopes are relatively cheap these day. An average scope on a good mount will out perform a good scope on a poor mount.
Barry
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