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Having played around with all sorts of video/camera lenses trying to make simple telescopes I would say that for a practical device you are wasting your time but for a bit of fun and experience it could be quite a useful experiment.
The biggest problem with these lenses is they are designed to come to infinity focus about 1" from the back of mount. An adapter can be made for a simple straight through eyepiece if you have access to a lathe or can find a suitable device but there won't be enough length to add a diagonal and still come to infinity focus.
Interestingly enough however many of the diagonals have a thread in the nose that will take the convex lens out of a barlow assembly and increase the focal length to a point where focus can be reached at the expense of doubling the magnification.
Barry
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