Re: Official: Fujifilm GFX 50S Medium Format Announced!
gdanmitchell wrote:
One potential advantage of a larger format (though everyone needs to keep in mind that \"mini MF\" 33mm x 44mm is not that much larger than full frame!) is that it can provide a greater range of usage aperture options and potentially more control of DOF. (Note that \"more control of\" is not the same as \"more.\")
While acknowledging that in many cases the maximum aperture available may be smaller with larger format system lenses, one can use smaller apertures with less effect from diffraction blur in the final print at a given size. So while you might avoid using, say, f/22 on a full frame system in most cases, you could use it with less concern on a mini MF system.
(Many reading this will already understand, but others should be cautious about extending this to be equivalent to things said about \"real\" medium format systems, which typically were larger-to-much-larger than mini MF.)
Dan
Matt Grum wrote: Steve Spencer wrote:
Matt if you shoot portraits at an aspect ration of 4 to 3 or squarer (such as 4 to 5 for an 8 X 10 or 16 X 20), then the crop factor for FF 35mm compared to this mini MF is 1.38X. So the Fuji 110 f/2 will be very similar in effective focal length and depth of field to an 80mm f/1.4 lens on 35mm FF. The FF 35mm will still have the slightest advantage, but it may well be within the rounding range of how aperture is reported, and sure there are a couple 85mm f/1.2 lenses for FF 35mm, but the Fuji 110 for portraits will be very very close in creating depth of field for portraits to what you can get on FF 35mm at least if you crop to most typical framing ratios for portraits.
The point I was addressing was that \"MF offers shallower depth of field\" - being close (but still worse) at exactly one focal length, whilst not getting anywhere near at other lengths such as 50mm f/0.95, 105mm f/1.4 doesn\'t really equate to \"better\" in my book.
I\'m not saying the system is inadequate for portraits, far from it, it\'s just not \"better\" when \"better\" is defined as shallower depth of field.
Sorry Dan that is wrong . It\'s going to start diffracting at F8. I owned 5 Phase backs with tech cams and DSLR bodies as well. Diffraction is a big issue . tilt and shift lens mounts or tilt in body are huge pluses to avoid diffraction and gain DOF without stopping down. Focus stacking is another technique used very often. I had a tech cam where the lens mount itself would do tilt and shift, Cambo to be exact. Arca also has it in their lens mounting plate. FYI phase one 80 Mpx back actually starts diffracting at f5.6 given the pixel pitch and tech lenses. Hard to spot but it starts there.
Sep 20, 2016 at 01:27 PM
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