|Being from camera background, I have made in the past spotting scope from older secondhand lenses.|
Camera lenses are usually made to higher standard than most spotting scope.
Large telescopic film camera lenses are now can be obtained for cheap due to their different film plane sizes from most "cheaper" digital cameras.
If you attach a good telescope eye piece to the real lens cap of a camera lens. you will get a very good spotting scope.
Unfortunately I do not have one to show right now.
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