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That's a very sharp shot, and you've captured both expressions very clearly.
With the APS-C sensor, the effective FL is +60% - 320mm, which I feel is plenty most of the time.
I have a 2x extender which takes it out to 640mm and f/5.6 , I've managed a few hand held shots with this from time to time, but it's really a tripod lens at that length.
For astro work the absence of fringing is outstanding, and not too bad with the extender.
Some images would be good. I'm keen on seeing what others are achieving with their equipment.
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