12/7/2023 0 Comments 50mm on aps c vs full frame![]() Sensor size is definitely a factor of Depth of Field. We recognize blur much easier when enlarged more. The CoC computed for a smaller APS sensor has LESS DOF than a larger sensor, because (like tiny film) a smaller sensor is a smaller image which must be enlarged more to the final viewing size, and enlargement is detrimental to apparent depth of field. ![]() The distance limit of the depth of field is where the blur circle diameter is computed to exceed the maximum acceptable Circle of Confusion, which is computed from sensor diagonal size.Ī shorter focal length has greater depth of field than a longer focal length.Ī stopped down aperture has greater depth of field than a more open aperture.Ī greater focus distance has greater depth of field than a shorter distance. In other words: 56mm/1.4 clearly is the bokeh winner for background bokeh, even though at equal framing the 30mm/1.4 lens will be better at dissolving foreground objects (like when shooting through a thicket or fence that is still in reach, given your desired subject framing).ĭepth of Field is computed from focal length, aperture, focus distance, and also sensor size. So for best background blur, you want the bokeh circles to appear larger and would choose a focal length that does not let the background shrink as much. However, the world makes it into the camera by perspective, and with a shorter distance, objects grow faster in the foreground and shrink faster in the background. The cone sections of this cone determine the size of bokeh circles in the world. Of course, you would not use those lenses at equal distance if you aim for the same framing.Īt equal framing, your object distance will be proportional to the focal length, so the geometry of the cone from entrance pupil to a point in the subject plane, given equal framing, only depends on the aperture number. So at equal distance, the background will be most separated with the last lens. So you have 30mm/1.4, 50mm/1.8, 56mm/1.4 and the latter clearly is the largest. The size of the eye you are looking out is f/a where a is the aperture number. would the 56mm f/1.4 Sigma or the 50mm f/1.8 Minolta give more bokeh on the Sony a6500 body?. ![]() which lens is going to give the most bokeh on a 1.5x crop sensor body?Īlso, recognizing that the two lenses are different full frame equivalent focal lengths for this body (the 50mm becomes a 75mm equilvalent on the Sony a6500), if I swapped the 30mm Sigma f/1.4 for the 56mm Sigma f/1.4.I can get some pretty decent bokeh with my Sigma lens, especially on detail shots, but the bokeh I can get with the Minolta lens is also just as good, sometimes better, when I use that Minolta lens on a "full frame" 35mm film camera. There are plenty of threads that discuss the math and such behind using full frame lens on crop body(examples here, here, here ).īut no one seems to be addressing the effect that this might have on bokeh and other artistic values of the images. Vintage Minolta 50mm f/1.8 full frame lens (with adapter for Sony E mount) I am using Sony a6500 camera (APSC 1.5x crop factor body). I am trying to compose a detail shot where I want to get as much background blur as possible. ![]()
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