Sample Gallery: Canon RF 50mm f/1.2 USM L - Printable Version +- Opticallimits (https://forum.opticallimits.com) +-- Forum: Forums (https://forum.opticallimits.com/forumdisplay.php?fid=4) +--- Forum: Canon EOS (https://forum.opticallimits.com/forumdisplay.php?fid=11) +--- Thread: Sample Gallery: Canon RF 50mm f/1.2 USM L (/showthread.php?tid=4262) |
RE: Sample Gallery: Canon RF 50mm f/1.2 USM L - photonius - 11-22-2018 (11-19-2018, 10:25 AM)obican Wrote:(11-18-2018, 02:58 PM)you2 Wrote:(11-18-2018, 12:29 PM)Klaus Wrote: Well, it is just a 50mm lens so you have to get fairly close for a real shallow DoF. well, maybe it relates to the entrance pupil. While for most applications aperture is a "good enough" approximation, DOF is actually dependent on the entrance pupil (which is usually taken to be the same as the aperture) - at least that's how I understand the info one finds. But entrance pupil and aperture does not have to be the same, and depending on the lens design, this can be quite different. Hence it should be possible to design lenses with the same focal length and aperture, but difference in DOF. I thinkĀ a factor of 2 is usually the maximal difference one can see (mostly in macro lenses?). So for real world experience, it's not a big deal, so DOF calculators just use aperture, as that's what's easily readable from the lens. Anyway, the experts can probably explain that better than me. RE: Sample Gallery: Canon RF 50mm f/1.2 USM L - Brightcolours - 11-22-2018 Entrance pupil and aperture never are the same, unless there are no lens elements in front of the aperture. RE: Sample Gallery: Canon RF 50mm f/1.2 USM L - Klaus - 11-25-2018 The MTFs look rather good ... ;-) RE: Sample Gallery: Canon RF 50mm f/1.2 USM L - Brightcolours - 11-26-2018 We suspected that already... ;-) |