Long post, bear with me, but TP is the place to ask… I’m considering trading RX10iv for used A7rii for wildlife. Crazy?
1” image detail suffers to my eye unless the ISO is under 1600-3200, woodland UK is dark except in the best weather. Flighty stuff it’s 1/1000 minimum, even with wide open f/4 ISOs are hard to keep down.
I shoot slow and steady, don’t need 5fps. I’d probably miss the RX’s easy tracking AF, but I did manage perfectly with SLR centre point PDAF for many years. (What I won’t miss is the power zoom, I’m used to riding a zoom in and out to locate stuff in the first place).
My thoughts are that the A7rii PDAF centre points are plenty good enough for my use. Pair, say, a Tamron 100-400 and even with that slower lens, cropping 42MP FF at ISO12800, even 25000, should yield more workable detail than the equivalent view on 20MP 1” at ISO3200.
I’d consider an A6400 but I prefer three dials, I set SS and aperture for the subject but adjust ISO on the fly - I just like the A7 series ergonomics. Money no object I’d be looking at more recent cameras, but I’m aware of budget and this is minimal cost to change. What would you do?