R7 + 400 5.6L length

drsnoopy wrote:

Bigger wrote:

sflaqua34 wrote:

Hey, I was wondering if anyone here with the R7 and EF 400 5.6L could tell me the length of the combo after the adapter has been added? I've been trying to find it out through google but it's difficult to find exact dimensions of all of the camera's measurements.

I would like to know from end of the viewfinder to end of the lens of course with hood down to try to see if it would fit in my bag the way I want.

I would not recommend this setup if you have other options. The EF400/5.6L is actually sharper in the full-frame corners than in the center. So the APSC crop throws away the best part of the image circle.

If you already have the combo, then use it--it will work OK, but it's somewhat sub-optimal. If you are buying, the RF100-400 would be a better choice, unless you wanted the look of the EF400 for some reason (it is warmer and softer).

Plenty of 7D2 + 400/5.6L users in the birding community and I’ve never heard adverse comments about sharpness. Would be at least equally good on the R7, but with the very real benefit of superb tracking AF.

Yes, but I think the AF would be even better on the RF100-400. I put together that MTF comparison as well:

Canon MTF plots for EF400mm f/5.6L (left) vs. RF100-400 @ 400mm f/8 (right, mirror image).

On the left, this chart uses Canon's old format where blue lines are @f/8, so ignore the black lines on the left for this comparison. At 10 lp/mm (topmost set of lines) the two lenses are almost identical across the frame @ f/8, so there should be no difference in contrast.

At 30 lp/mm detail, they are almost identical in the center of the frame (edges of the chart). Unsurprisingly, the prime is a little better in the corners (center of the chart) for sagittal/radial edges (solid lines) and much better for meridional/tangential edges (dashed lines). The large separation suggests that the prime will also, unsurprisingly, have better bokeh.

Bottom line here is the same for the RF zoom @ f/8. On a FF sensor, the 400mm prime will look its best. On a crop sensor, the prime's advantage is diminished, so the size, weight, IS and AF advantages of the RF100-400, and the fact that it zooms, can make it more attractive.

The EF400/5.6 prime does have a distinctive look, though, and that can be attractive too. I saw a video about a narrow gauge passenger railway in Japan called the "slow life train" that really showed off this look, but I can't find the link now.