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Full-Sized jpeg duck shot with the 300+1.4
There's an unprocessed sample with a duck on a log right at the thirds mark, @DavidBM@, that will allow you some space for inspection. Just 24MP though. The bokeh and longer distance performance are what you give up using the TC. The Ed Mikah FD-to-EF conversion might allow for the use of a modern EF TC.
The bare lens does very well on an APSC camera at 24MP...
Just checked out the duck. Absolutely usable - passes the fine at 1:2 (even if 24MP 1:2) test, and takes a bit of sharpening without cost as well. Wow. that's with a TC. Looking forward to some manual bird fun (we are blessed with over 200 species of native birds visiting our garden - when I retire I'm tempted by some serious modern long iron and taking up photo birding - but that's a decade or so away)
On the rear filter issue" mine comes with the Canon installed, as is needed. But looking at the Canon rear filter if definitely single coated at best. I wonder if, being so close to the back with a reflective digital sensor, if replacing it with a multicoated one might not be the best bet. But it's fifty bucks down the gurgler if it doesn't matter. I suppose I could see if there is a flare difference with and without the filter, and if there is, do the change...
Yes I agree that crop zoom is pretty effective on the A7rII. It's what, 18MP for a 1.5x crop which isn't a huge loss compared to 24MP of a native APSC. And the TC gives no noise etc advantage over a crop, if you are light limited. But the TC plus cropping gets you to 600. It'l be interesting to do a comparison of lens+TC+crop versus lens plus double crop at 60MM equivalent. I'll post. I"m pretty sure that either would be better than a 2x TC.