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Nice. I only recently started in astro photography and finally got a decent mount to mount my telescope and DSLR. I am using a 70-200 F2.8 and can get some really nice pics of the larger deep space stuff, so with a TC you should be able to do even better!
Spend as much time as you can learning polar alignment. I have finally got it to the point where my images aren't an embarrassment, but there's a lot of improvement left to make longer focal lengths work without trails or annoying egg shaped stars.
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