It's definitely helping me wrap my head around these things as as newcomer. Thank you everyone for your great responses. I don't care that the focal length of the Panasonic DMC-FZ1000 is 9.1 to 146mm because I don't know what that means in relation to it's sensor size ('cause idk what that is), so it's super helpful for the quick google search to display "35mm equivalent focal length: 25 to 400mm" because I know what that looks like. It would be rather cumbersome to memorize all the different formats and what the field of view is for their particular focal lengths, which is why "35mm equivalent" is such a common phrase. If my full frame camera breaks and I have to borrow a crop sensor camera and want to shoot my normal 16mm equivalent, I have to know that I need a 10mm lens for my crop sensor camera. except when you're trying to determine equivalencies. Focal length is focal length and has nothing to do with the full-frame sensor size. No, they always give the focal length in the 35mm equivalent. A 16mm lens on a crop sensor camera will look the same as a 24mm lens on a full frame camera (if you have a 1.5x crop sensor, canon's crop sensors are 1.6x) So if you wanted to get the ultra wide 16mm field of view, you would need to get a 10mm or 11mm for your crop sensor camera. Your follow up: It's because they're letting you know what it will look like when comparing it to a 35mm (full frame) lens (as far as field of view is concerned). Yes (basically) - a 16mm APS-C lens will have the same field of view as a 24mm lens on a full frame camera (it will likely be quite a bit smaller/lighter than a full frame 16mm lens, too, which is one of the benefits of getting APS-C specific lenses). They would both be 50mm lenses, for example. However the focal length would be listed just the same as it’s full frame cousin. Images like below abound on the internet clearly illustrating the field of view discussion.Ī lens designed for APS-C would be smaller and project a smaller image circle (like the blue) that would only cover the smaller rectangle. You might find an APS-C zoom lens at 10-18 or 10-21, which would provide a field of view similar to a 15-35 or 16-35 on a full frame. Still wide angle, but not super wide angle. However, it will give you the same field of view that a 24mm lens (25.6 on Canon) would provide on a full frame sensor. When you buy a 16mm APS-C designed lens, it’s still quoted in the full frame focal length. My followup question: when I'm looking at a 16mm lens on B&H that is designed for APS-C, why does it show under specs: 24mm (35mm equivalent) ? I thought a lens couldn't be the same focal length on both an APS-C and a full frame/35mm sensor? So if I buy a 16mm APS-C lens (not designed for 35mm/full frame), it will actually give me a focal length of 24mm (16x1.5) on my APS-C camera? If you want a 16mm lens, you, you will need a 10mm APS-C lens (if you shoot canon, it's a 1.6x crop). I'm assuming that when a lens is designed specifically for APS-C, the listed focal length in the title is the exact length when put on an APS-C camera, without the need for any conversion multiplication?
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