I did this just to satisfy my own curiosity, but it might be of interest to anyone trying to decide which camera to get. (Apologies for those who saw the other post, but it was buried in a different thread.)
Of course - we all want to print as big as possible, but in comparing sensor pixel sizes, we think in terms of area, and when thinking in terms of printing we talk in linear terms.
I'd been thinking - 24:36 that means that if the
A7 is good for a 24" print then
A7r is good for a 36" print - but of course this isn't the case - actually
A7 is good for a 24" print
A7r will be good for 29.5" print
Easier to see it in graphic form.
Of course, this doesn't take into account the lack of an AA filter in the A7r (or the bigger pixels in the A7). They will have some effect, but it's not so clear what it will be.
I'm still anguishing whether to jump back in again - especially in the light of the excellent write up by Roger at LensRentals.com
This hasn't actually made the decision any easier!
all the best