![]() I don't know the answer but it shouldn't be so difficult to find out if you have two cameras, (an APS-C and a FF) and two 50mm lenses (an APS-C designed one and a FF designed one) - and a fixed tripod - do you have the same FOV? ![]() I suppose you could refer to lenses by their FOV just as easily as their focal length, it actually makes more sense, I think it makes zero sense to sell a lens as '.its a 50mm lens, but its actually equivalent a 75mm lens, but we didn't say that. I would expect that when I walk into Best Buy to buy a camera, for my old mother, and I buy a model with a 'cropped sensor' and it comes with a 50mm prime lens - that when I look through the lens I will see the same FOV as I would looking through a FF model with its 50mm lens.Īs a consumer I would have to say that either all of the manufacturers are scamming an uneducated consumer base - or they are actually doing what I suggest above, making a 33mm lens and calling it 50mm because the FOV is the same as real photographers (and old mothers) understand to be what you would normally see through a 50mm lens we all know and love. but then again,not everybody is in the know. It makes no sense that a manufacturer, say Pentax, markets two physically different lines of lenses, one range being for FF sensors and having focal length markings that 'real photographers' understand as being 'the real 50mm lens' - whereas their APS-C range has an inaccurate marking of 50mm - because everybody in the know, knows that really means 75mm. If I understand the initial question as - if a lens is specifically designed for an APS-C camera and it is marked as 50mm - is it actually, internally a 33mm lens designed to give the same FOV as a FF camera lens marked 50mm, that is 46.8 degrees (from the comprehensive table in an earlier reply) A 50 mm DA lens might have a small image circle that does not cover a full frame sensor. This is the size of the image circle projected by the lens. Third, a lens can have a "design FOV" which is the largest angular view that the lens is capable of producing without unacceptable softness and vignetting. For a given format, longer focal lengths have smaller FOVs. For a given focal length, smaller formats have smaller FOVs. Second, the FOV of a particular lens on a particular camera is a function of both the focal length of the lens and the physical size of the sensor or film format size of the camera. Focal length is entirely independent of the format of the camera it was designed for or the camera the lens is put on. The longer answer depends on three facts:įirst, the focal length of a lens is a geometric property of the lens and the lens alone. The FOV of SMC Pentax-DA* 55mm F1.4 SDM on APS-C will be much narrower than the FOV of the HD Pentax-D FA* 50mm F1.4 SDM AW on FF. Is the FOV of lens specifficaly designed for APS-C camera the same as lens designed for FF? For example is FOV of SMC Pentax-DA* 55mm F1.4 SDM on APS-C the same as HD Pentax-D FA* 50mm F1.4 SDM AW on FF?The short answer is no. The only time this fails is when the lens can't cover the sensor because it is desined for an even smaller sensor. So even a 50mm 645 lens on APSC will give the same width angle of view as an APSC one. The take away should be the sensor size sets the angle of view for all lenses of a certain focal length. Other crop lenses barely cover the APSC sensor and wouldn't be able to shoot a wider image But this is due to a lack of image sensor coverage. Some crop lenses can cover more than the bare minimum and can shoot respectable shots on a Full frame sensor with roughly the same angle of view that a full frame would have. That's what happens then camera sensor isn't as large as the full frame lens covers so the image is cropoed on all sides. The full frame lens will appear narrower in any APSC camera.Ī way to think of it is if you have a 13x19 frame and picture and then add an 11x14 Matt directly over the image - the scene you see will look narrower. The fact that It is desined for APSC or ff isn't what matters as far as field of view. So lets use the DA 50 f1.8 and the fa 50 f1.4.
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