It's hard to pinpoint. I think part of it is that none of my RX100/RX10 shots feature shallow depth of field. I wouldn't say shallow DOF shots are prominent in my photos, but they're there and they're important. I have plenty of photos taken in places where the background contributes to the image, but also plenty where it's a distraction that needs to be reduced. And in wildlife photos, my Sigma 100-400 at 400/6.3 on APS-C blurs backgrounds just a bit more than the RX10 at 220ish/4 (both 600mm equivalent). I'd like to go a little faster still when I choose a long tele for my Z5.This is interestingI love the idea of simplifying down to a bridge camera and a compact digicam, but as even though my brain acknowledges that the image quality is good enough, I still find results from APS-C (and certainly full frame) more satisfying.Can you explain why/how you find the results from APS-C or FF more satisfying? What makes the difference?
The rest of it is probably pixel peeping and feeling good about the image quality in a way that doesn't really matter. Backyard wildlife shots with that Sigma on my D7500 look just a bit crisper than the RX10 III (even though it has an excellent lens) when looking at 100% views. And even though the RX100/10 shots are generally plenty sharp enough, when I look at those 100% views, there's just something a little less "natural" or "photographic" about the images than the larger sensor shots. They don't scream "this was taken with a small sensor compact!" But there's something about them - again, at 100% - that isn't quite as satisfying.
Basically, they're good enough that if the cameras themselves were more satisfying, I'd be content with the compromise. But between the usability differences, the lens limitations (shallow DOF mostly) and that slight little IQ difference, it's too much compromise.
If the RX10 IV was redesigned with better (for my tastes) controls, a nice, big, high res EVF, and maybe a manual zoom instead of power zoom (icing on the cake, though it might very well be impossible) then I'd be awfully tempted to own that and a compact (larger sensor) camera with a compact fast prime. But the lens lineup I've settled on gets me close enough with ILCs by allowing me to carry just 1-2 lenses (different lens depending on what I'm doing).
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Dennis
Gallery at http://kingofthebeasts.smugmug.com