There still is a price difference between a crop-sensor (APS-C) and a full-frame, with a full-frame being the pricier option. Which in turn means this lens will only project onto the middle of a full frame sensor instead of giving full coverage.However, technological advances have also been significant for crop-sensor cameras. So your APSC camera is simply not capturing that extra image lying outside the APSC sensor size area which the old 50mm lens is projecting, but a full frame camera could.Ī lens designed for APSC is just basically so they can make it smaller and lighter by using smaller diameter glass to only project the required smaller (but still same size image) coverage onto the smaller sensor area only. It's the same as cropping and enlarging in photoshop. If both are captured at exactly the same resolution, eg 4000 pixels wide, it will give the illusion the smaller image is actually closer up or zoomed in, hence a 50mm on APSC being an 'equivalent' of 75mm on full frame. This wikipedia image illustrates it the simplest - same size image projected by the lens, just capturing a smaller segment of it. They all project the same image regardless, just less or more of it is captured by the different sized sensors, that's all. So even though your 18-55mm zoom is designed for APSC, the 50mm marker on it is still the same as a standard 50mm lens. That surprised me, but not so much as I thought about it.Yes, because they all still use the same focal length measurements. I finally did a test to clarify the issue and found that if I set my two APS-C camera zooms (a Pentax and a Tamron) at 50mm and take pictures, the result looks identical to one I then take on the same camera using an old Pentax SMA 50mm prime. So it seems that so long as I use my APS-C camera, I will get the same results irrespective of the basic design of a lens (FF or APS-C) so long as the focal length is the same. All I care about is results I'll get on my APS-C camera. Many sites get caught up in the crop issue and only seem to compare and discuss results from a FF vs an APS-C camera. So if you printed them both, the size of objects in each respective image would be identical. Despite that, the portion of the image that does show up should match the size of the image resulting from the 35mm film type lens. However, if you do this on a FF camera, then there would be vignetting on the photos that were taken with lenses designed for an APS-C camera. If the camera is an APS-C device, then all lenses set or designed to a given focal length will give the same field of view in the resulting images. That surprised me, but not so much as I thought about it.Īfter looking at a number of web sites with various graphics, it seems to me that no matter what type of lens you use, so long as you use them on the same camera you will get the same result. So I (erroneously) thought that if I had a 50mm film era lens and used it on my APS-C camera, the image would look like I'd used a 75mm lens designed for a digital camera. I've seen web sites that say that if you use a lens designed for 35mm film on an APS-C camera it will give different results than if you use a lens designed for cameras with an APS-C camera. Now to my confusion which may be the result of reading some erroneous information. I understand that if you use a lens designed for 35mm film on a FF camera then use it on a APS-C camera, the images look different as the APS-C results in a 'cropped' image because it is a smaller portion of a FF area so you are in effect cropping the image as you take it. I thought I fully understood the whole crop vs full frame sensor issue, but clearly don't.
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