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I assume this is all for astrophotography purposes or is it (also) for terrestial subjects ? They may not be complementary.
For purely Astro I'd be looking for an older APO. You'd be running the camera in manual mode regardless so all the fancy stuff is useless but a piece of good preloved Canon prime or even zoom APO glass is top notch. 135mm would be my ideal setup in that case. I'm not a Canon man but they do make some damn fine lenses.
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