Dave Canon
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Yes good shot. Thanks for showing an example. As a matter of fact when I use my FF Canon 5D4 in a studio, I do sometimes use my 70-200mm f2.8 and step back to take a longer shot. With the longer focal length it is possible to get the subject all in focus. I am still not sure what I will use my 35mm F1.8 for but probably night photography.I feel the same about people pictures and I mostly want the whole head in the DoF not just one eye but if limited DoF at longer than a tight head an shoulders shot is wanted then a wide aperture will be needed plus some people just like subject separation, smooth out of focus backgrounds and bokeh balls. Put any number of these things together, distance, separation, a desire for smooth rendering and bokeh balls and f1.4 and even f1.2 on FF are what does the job.
On APS-C f1.8 equates to f2.7 on FF for DoF which isn't particularly wide these days. f1.2 on FF can be pretty extreme.
If it helps at all I did a comparison at 40mm f1.2-2.8 at various distances.
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Differences at f1.2, 1.4, 1.7, 2, 2.8.
Just out of interest. The difference between f1.2 and f1.4 for DoF and bokeh has cropped up a couple of times so I thought I'd post a series of pictures. Note that I'm ignoring light gathering here and just looking at depth of field and bokeh. I looked at bokeh and depth of field years ago and...www.talkphotography.co.uk
I'm not a great user of extreme aperture but I do like this one, 40mm f1.2.
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Other than that. I do have a 85mm f1.8 picture printed and framed.
Dave