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Forum: Pentax K-1 & K-1 II
06-21-2016, 03:23 PM
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I don't think anyone ever said FF offers "better" depth of field.
What is better, however, is the strength of background blur. @biz_engineer points it out, but I'll go one step further. Blur also depends on the distance from the subject to the lens; in many ways, you can say it is the ratio
focus distance / subject to background distance
that matters most. The closer you focus, the stronger the background blur. Longer focal lengths exaggerate this effect. People generally try to fill the frame with their subject. Let's use the FA77 as an example. Let's suppose that you can stand 5 ft away from the subject with the full-frame camera. On APS-C, you need to back up to 7 ft or so. Thus, the blur will be less because the focus distance has decreased. The aperture gets in there too, but you need to crank open the aperture far more than you might like to see significant difference--try it! One stop or so doesn't make a big difference because you can't increase the subject to background distance.
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