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Hi Ken, many years ago I recycled two camera lenses from my SLR days.
These old camera lenses can still be found, ranging from 135 to 1000mm and make a very nice super-finder for a larger telescope, cheaper than buying a good refractor.
However ... they are not sharp at high power and unsuitable for imaging - a modern sensor like yours has pixels far too small.
Even the recent canon full frame sensor with 19micron pixels is probably not going to work well.
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