melcat Offline Upload & Sell: Off
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I would never go back to a mixed full-frame/crop system.
In my case the full frame 1Ds Mk III and 1.3× crop 1D Mk III were pretty much identical in their handling, controls and menus, differing only in sensor size, frame rate, resolution and high ISO performance. OP doesn’t/won’t even have that, since the R7’s control interface is radically different from every other Canon camera before or since.
The big relief in moving to an all–full-frame system for me, though, has been in trip planning. Take, for example, a trip to a semi-arid area which is a multi-day drive from Melbourne in each direction, which I only get to around once a decade – no making multiple trips in succession with different gear each time. It has spectacular scenery and harsh light, so I want my full frame sensor and ultrawide. It has wildlife not present in my home state, so I want my wildlife-capable camera, which the 1Ds Mk III is not. Previously I would have needed to carry both the full frame and crop bodies to do that – which means carrying an extra kilo even to lunch and petrol stops (in Australia, you don’t pay at the pump). Now, with the 100–500 and R3, I need only one body.
As for whether to settle on full frame or 1.6× crop, it’s clear at this stage that Canon has little interest in making good APS-C lenses, leaving that to Sigma. At any time, some MBA at either Canon or Sigma could decide the profit isn’t there, leaving APS-C to stagnate or discontinuing it outright. In Canon, the “happy path” is full-frame.
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