Sell the R5 and get an R7 and R? Crazy?

Steve Fink wrote:

ThrillaMozilla wrote:

Sittatunga wrote:

mraifman wrote:

... For my bird photography, I find myself always using crop mode on the R5 and also wishing for more subject differentiation and nicer blurred backgrounds.

If you're always cropping your shots a lot, subject differentiation and nice blurred backgrounds are a function of the size of your lens aperture, not the size of the sensor. If the distances are the same and the focal length and aperture are constant, the geometry doesn't change, so the subject differentiation and background blur won't change, whatever the crop. You need a bigger aperture (in mm, not f/ number) to improve those things.

Absolutely. Switching camera bodies between R5 and R7 won't help at all with (1) depth of field; (2) out-of-focus background; (3) noise, or (4) high-ISO performance.

The R5 will not capture a single photon from the duck more than the R7 will.

The LENS, and the lens APERTURE (diameter) determine all of those properties. You don't switch camera bodies. You switch lenses.

He has a fast lens in the 300mm f2.8 and tried the 2x to make it 600mm f5.6. He didn't like the results.

However,BIF photography, which what the OP suggested they are, look at the R7 for the 1.6 crop factor reach, not the things you are suggesting. My 600mm on the R7 gives my a 960mm focal length equivalent, important because I can't move my feet for bird in flight. The same 600mm on the R5 gives you a 600 focal length. Hence, you get closer to the birds and require less cropping. DOF, bokeh are important but secondary.

Yes, that's what I was thinking too. Just a confusion probably sparked by me not writing it all out.