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nice houghy!
i doubt your issues are lens/sensor tilt. i think you can for sure rule out sensor tilt in DSLRs.. they're made to work with f1.4 lenses and i've never seen any evidence of issues in that regard.
i've had a lens element in a 50mm f1.8 get out of alignment before which is why i now use the 50mm f1.4. but i'd be surprised if that was the case with your tele lens.
it looks more like an alignment/stacking issue to me. do you see any issue in the individual subs? if you stack the first and last frames what do you get? can you try alignment/stacking with something other than dss and see if you get same result?
cheers
Phil
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