If you go from FF to APS-C, then you divide by 1.5, so if you use a FF camera with an 85mm f1.8 lens and you want the same look on your APS-C camera, then you must find a 56mm f1.2 APS-C lens. Here I just divided 85 and 1.8 by 1.5. Stop confusing people with this nonsense.
A lens designed for a full frame camera will project a circle that is wide enough that the rectangular full-frame sensor will fit inside that circle. An APS-C camera's sensor will also fit inside that circle, but it will take a correspondingly smaller portion of the image, because it's a smaller rectangle. Lenses designed specifically for APS-C
As you can see, when shooting at the same focal length on a full-frame vs. APS-C sensor, the frame area is significantly different. The viewing angle also changes on a crop sensor. Therefore it would be incorrect to say that the 50mm on APS-C is same as 75mm (50mm x 1.6 crop factor) on a FX camera. While it's a worthy optic on both full frame and APS-C bodies, it truly comes into its own when paired with the Canon EOS R50 or R100 – where, as the niftiest nifty fifty, it becomes an essential prime lens for everyday shooting, travel, street photography and video work. See our full Canon RF 28mm f/2.8 STM review It has a full-frame sensor which captures a lot of information. Where the A6400 shines is that it has very good autofocus and has a total of 425 phase and contrast-detection points, whereas the Going to MF, that made a difference, but, just like going to full frame, there's trade offs. The bigger the sensor, the harder it is to do things. Your APSC probably has a faster burst rate and other small things that are a benefit to having a smaller sensor. Unless you have a specific need for the Full frame, you don't need to do it, you just
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A full frame camera with a 500mm lens will image 4.1° x 2.7° of the sky. The same camera with an 800mm lens will image 2.6° x 1.7°. An APS-C camera with a 500mm lens will image 2.6° x 1.7° -- the same as the full frame with the 800mm. It doesn't mean the image quality will be the same -- there are too many other variables involved.

An f2 lens on APS-C will render an f2.5 field of view on full-frame if you’re using the most common-sized APS-C sensor offering a 1.5x crop factor. But here’s where it gets really odd.

Full-Frame vs APS-C vs M43 vs CX Lens Size / System Size. Now take another look at the first image in this article and the above image and note just how much of the photograph is getting chopped off. Manufacturers quickly realized that there were advantages to using smaller sensors. APS-C vs Full Frame: pros and cons. The first thing, and the most obvious difference to point out, is that our two sensors up for discussion differ in physical size, and that the surface area of a APS-C is an industry-wide term that describes digital image sensors roughly 22x15mm in size. An APS-C sensor is significantly smaller overall than the 36x24mm dimensions of a full-frame sensor. The modern full-frame camera is based on the classic 35mm film frame, long deemed an industry standard for professionals and enthusiasts. .
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  • full frame vs aps c lens conversion