Brief Explanation of Full Frame and APS-C Cameras. The full frame sensor is the larger of the two. It is the size of a 35mm film frame – 36mm x 24mm. The Canon APS-C sensor is smaller at 22.3mm x 14.9mm. The field of view (how much of a scene you can see through the viewfinder) is smaller when using the same lens on an APS-C format camera
You may find however, that the image circle on the APS-C lens doesn't leave as much black in the corners as you might think. If I put an A-mount kit zoom on my full-frame, I get the whole screen illuminated from about 35mm up.
6 x 7 Crop Factor = 0.5. The 6 x 7 format frame is 56mm x 67mm. It measures 87.3mm diagonally. The 6 x 7 format is the easiest crop factor to calculate at roughly half the equivalent focal length for full frame cameras. Popular 6 x 7 medium format cameras include the Mamiya RB67 , RZ67 models and the Mamiya 7 ; Pentax 67 models ; Bronica GS-1You will be utilising the full size of the full frame sensor in these cameras. EF Lens + APS-C Sensor RF Mount Camera: If you use an EF lens with an adaptor on an APS-C RF mount camera (EOS R7 or EOS R10), then there will be a crop factor applied of 1.6x. An 17mm lens (APS-C or Full frame) on an APS-C body have a similar field of view to a 27mm lens on a full frame body. That doesn't mean that it is a 27mm, there is no real conversion. Focal length is an optical property and it's a bit more complicated than saying that the body "converts" the focal length. People will use "equivalent focal Alternatively, the imminent 28-70mmF2.8 provides similar range, DOF and light-gathering with a weight of only 470g if you don’t need the mechanical focussing. I don't think the 28-70 f/2.8 is a suitable replacement for the 18-35 f/1.8 for several reasons: 28mm FF at APS-C crop factor is 42mm, while 18mm APS-C is 27mm. This Sony 16mm f/2.8 is a tiny, low priced lens with performance to match. It sees the same angle of view on APS-C cameras as a 24mm lens sees on full frame. This lens isn't much bigger than a body cap. It's probably the lightest lens I've tested, at just 2.3 oz./65g, because it's both tiny and made mostly out of plastic, with aluminum exterior The APS-C sensor that we have in our DSLR cameras (except the most expensive ones) is quite a bit smaller (16.7mm × 25.1mm) than the 36mm x 24mm of the old film. This means that the standard lens (as defined above) will be a shorter focal length, somewhere around 31mm. The difference between these two numbers is called the lens conversion The Nikon APS-C lens range was extensive and mostly inexpensive and the Canon APS-C DSLR scene was equally vigorous. The best cameras for beginners were APS-C models back then, as were most of the best cameras for enthusiasts. Sure, professionals would be looking at the best full frame cameras instead, but they were much more expensive and APS
Simply multiply your aperture, just as you would your focal length, by your crop factor to find the equivalent full frame aperture. So, a 35mm f/1.8 on APS-C is roughly equivalent to a 50mm f/2.8 on a full-frame camera. You could, however, shoot with the same lens, at the same aperture, from the same distance, and get the same depth of field.