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The most significant....
I started to slide out of amateur astronomy from about 1993 and got rid of my stuff shortly after as I could see it was going to change a lot. Until now... Looking back the most significant changes I'd say they are:
- Dobsonian mounts,
- Digital imaging and autoguiding, both cameras and CCD heads;
- CNC machining and what that has done for mounts and telescope parts;
- modern glass types, with respect to what that has done for eyepieces and refractor objectives, and
- what the Chinese manufacturers have done to costs.
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