Spoiler 3.1: for comparison, the pictures from the crop and the full frame were adjusted to the same size. Spoiler 3: In this article, I show images reduced to the same pixel dimensions - 1200 pixels on the long side. You can conduct your investigation of circles of confusion at infinity yourself. I did not do this, because the experiment can be considered not 100% honest. Spoiler 2: I was asked to do an experiment with a point source of light placed at infinity. Spoiler 1: different cameras of the same type (crop or full frame) have different number of megapixels, but the ratio of the blur disk to the entire frame will be the same. The same number could be obtained thanks to the coefficient crop factor Kf = 1.5, squaring it.Ī serious conclusion suggests itself.: if you shoot with crop and full frame cameras on the same lens, on the same aperture value and from the same distancethen the blur effect on the cropped camera will look stronger due to different proportions of the blur zones. When switching from full-frame to cropped, the ratio of the unsharp disk to the entire frame increased by approximately 2.3 times. In this case, the size of the circle is 1/190 of the image of the entire image (0,53%). The area of the circle is Pi * D * D / 4 and is equal to the same 54.297 pixels. The cropped image from the Sony a7II measures 3936 x 2624 pixels (10.328.064 pixels). The size of the circle is 1/442 of the image of the entire image (0,23%). The area of the circle is Pi * D * D / 4 and equals 54.297 pixels. By blur, we can mean the size of the circles of confusion. Look at the next two pictures and note for yourself where the background blur is stronger. It should be just the opposite! We all know the tale that full-frame cameras blur the background more. So, switching between FX DX formats and shooting the same scenes with the same lens, I have noticed that at times the near and far blur in DX looks (visually looks) stronger than in full frame FX. With electronic viewfinder Sony a7 even simpler - there you can immediately see the image obtained from the central part of the sensor without darkening areas in EVI. But psychologically it is much more convenient to line up the frame directly during shooting. Of course, I understand very well that the exact same result can be obtained while cutting out the central part of the photo during processing (the result will be 100% similar to what I get with the 'DX format 24 x 16 ′ function). Such a trick makes it easier to crop a future frame, to reach more distant shooting objects.

Visually, it seems that a lens from a 50 mm fix turns into a 75 mm fix. In fact, in the optical viewfinder, I see only the image that I will get after the shutter is released. I have set the AF Point Illumination to Off, which allows me to darken the unused area of the image visible in the DX format 24 x 16 JVI. image area 'and select' DX format 24 x 16 ′ there. To do this, in the camera menu, just turn on the 'Image area' -> 'Select. Sometimes I can't get close enough to the subject, then I turn on the crop mode. For me, this turned out to be a very nice feature when shooting with prime lenses.Įxample of using crop mode: I often shoot events with a fast-moving lens Nikon 50 / 1.4G and a full-frame camera Nikon D700. The ability to shoot in crop mode allows me to manipulate the equivalent focal lengths a bit ( EGF). To put it simply, full-frame cameras can be made to 'crop up'. The size of this area exactly matches the size of the sensors on cropped APS-C cameras. This mode uses only the center area of the camera sensor. For example, you can use the APS-C crop mode (DX for Nikon). Rise CROP! Rise from the Dead! Reveal your BOKE!įull-frame cameras Nikon and Sony (maybe others) can work both in normal full-frame mode, when the entire camera sensor is used to obtain an image, and in crop mode.

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