The rule of thumb, “expensive usually means better” doesn’t exactly ring true with full frame sensors – there are great benefits to full frame sensors but that doesn’t make them intrinsically “better” than APS C crop factor sensors. To better understand the pros and cons of full frame sensors, we have to ask: what is a full frame sensor?
A: Finding the Full Frame Equivalent of Your Lens. This visualization is to help you understand what 35mm equivalent focal lengths you are actually getting out of your lenses depending on the camera that you put them on. For example, a 28mm lens with a 1.3x crop factor, has an effective field of view of a full frame lens equal to 35mm.
Someone told me that hen using Full frame lens on APS-C camera (1.5x crop factor) in addition to multiplying focal length by crop factor (e.g. 35mm * 1.5 = 52mm actual focal length on APS-C) you also need to multiply maximum aperture by crop factor e.g. if lens is F/1.8 you F/1.8 * F/1.5 = F/2.7 actual aperture of lens when used on APS-C?
Well, the first answer is that the focal length on the 36×24 camera is double the focal length of the m4/3 camera (50mm vs 25mm) so the full frame camera requires more light to get the same exposure on its larger sensor. That’s why the virtual aperture is larger. This also helps us explain why we have f-stop numbers in the first place. So this lens on an APS-C camera will have the same field-of-view as a 52.5mm lens on a full-frame (i.e, 135 format or 35mm - don't get confused with the format being the same as the focal length - it's just a coincidence) camera. The depth of field and bokeh (background blur) will be approximately the same on a full frame camera with f2.8 and on an aps-c with f1.8 (on the same focal length - for examples aps-c=50mm, FF=75mm), but with the same settings (ISO+shutter speed), the aps-c+f1.8 will be slightly brighter than the FF+f2.8. Hope its kinda understandable :D. For Thumbtip to little-fingertip = 50mm framing on APS-C, or 80mm on full-frame (click on the image to see it full size). And if I extend my arm, across the peaks of three knuckles spans a 300mm frame. Three knuckles = 300mm framing on APS-C, or 500mm on full-frame (click on the image to see it full size).
Standard Lens (35mm-55mm) A standard lens has a set (prime) focal length that is around the same length as the sensor or film (measured diagonally). For a full frame sensor, your focal length would come in right around 42mm. Often a lens falls between 35mm to 55mm can be categorized as “standard” focal length.
If you’re not familiar with 'crop-sensor' cameras, the big advantage of the smaller APS-C sensor compared to the best full frame cameras is the 1.6x crop which extends your effective focal length of lenses. This is ideal for wildlife and sports when, for example, a 400mm focal length effectively becomes (1.6 x 400mm) 640mm.
Remember, the focal length given represents the result on a full frame body. Let’s take the example of a 50mm. It doesn’t matter if it was originally designed for APS-C or FF format, the focal length of a lens doesn’t change. It is the field of view that varies depending on the size of the sensor on which you place the lens.
The FE 85mm F1.8 is expensive. Telephoto zooms are good at the same focal length and allow more options. Most 85's including the FE have a lot of chromatic aberration especially when used wide-open, and the fringing is magnified by the crop. 85mm on APS-C is similar in angle-of-view to a 135mm on full-frame, not the most popular focal length. Lens A (full-frame 50mm prime lens) will shoot equivalent to a 75mm focal length Lens B (cropped-sensor 50mm prime lens) will shoot equivalent to 75mm focal length as well APS-C/Super 35mm – AUTO
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Full-Frame Nikon D800 + 24-70mm zoom lens at 24mm Crop-Sensor Canon 80D + 18-55mm zoom lens at 18mm (equivalent focal length = 29mm) Full-Frame Nikon Z7 + 28-75mm zoom lens at 28mm. 3. Standard lenses / normal lenses have focal lengths between 35mm and 70mm. They capture the world in a way very similar to how our eyes see.
For the full frame this value is 45mm but usually rounded up to 50mm for convince. For the compact digital (APS) this value is about 33mm. One last point: Over the years camera sizes have shrank due to technological improvements in film and imaging sensors. This trend will continue. The focal length of the lens consigned also reduced
