And here is no.3.
I think it is worthwhile to compare these alternatives, 5DSR/100-400 f4.5-5.6L IS II to a 1DX-II/600 f4L IS II. There are lots of differences, but only a few makes the difference to me. A 1DX-II provides 4k video (I could not care less), it gives you 14 fps vs. 5 fps, AF is slightly better, buffer size is better, high ISO is better, ergonomics is better (not everyone would agree, due to size), file sizes are smaller and resolution is less. The lens provides a fixed f4 and you can go all the way to 1.200mm, with full AF. Size and weight is significantly in favour of the 5DSR/100-400 combo though and the price is 1/3 (think of all the stuff you could get for that amount!). The 5DSR is a bit more sensitive to shake, but not as bad as some people say. in general you can expect to lose up to one stop, due to a higher shutter speed requirement (unless you already are in the 1/500s or faster area, with this combo).
The resolution on the 5DSR gives you a tremendous cropping capability, which compensates for lots of the loss of reach. But 14fps, better AF and better buffer are important too.
I think it is worthwhile to compare these alternatives, 5DSR/100-400 f4.5-5.6L IS II to a 1DX-II/600 f4L IS II. There are lots of differences, but only a few makes the difference to me. A 1DX-II provides 4k video (I could not care less), it gives you 14 fps vs. 5 fps, AF is slightly better, buffer size is better, high ISO is better, ergonomics is better (not everyone would agree, due to size), file sizes are smaller and resolution is less. The lens provides a fixed f4 and you can go all the way to 1.200mm, with full AF. Size and weight is significantly in favour of the 5DSR/100-400 combo though and the price is 1/3 (think of all the stuff you could get for that amount!). The 5DSR is a bit more sensitive to shake, but not as bad as some people say. in general you can expect to lose up to one stop, due to a higher shutter speed requirement (unless you already are in the 1/500s or faster area, with this combo).
The resolution on the 5DSR gives you a tremendous cropping capability, which compensates for lots of the loss of reach. But 14fps, better AF and better buffer are important too.
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