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The technical detail displayed on most photo gallery pages are there because most photographers like to know some of this stuff, and because, with the digital photos at least, it's easy to extract the information. Older photos may or may not have any details. Usually I can remember the lens, and sometimes I can remember either the aperture OR the shutter speed because one of these was significant. For example, if the photos was taken hand-held, in low light, with my 300/2.8, then it's a given that the aperture used was 2.8.Although I can't remember what I had for breakfast yesterday, I can often remember these details about a photo I took 30 years ago. For digital photos the number in brackets is the 35mm equivalent focal length, for example, Canon EOS 10D, 70-200mm@122(390), 2x extender, fill flash, 1/350s, f5.6 This image was taken with a 70-200mm zoom set to 122mm which, when including the 2x extender, is equivalent to a 390mm lens on a 35mm camera (My current camera has a 1.6 crop factor, therefore 122x2x1.6=390). The f-number is the actual value, which is not necessarily the number indicated on the lens at the time. In the above example the lens was set to f2.8, but with a 2x extender the actual f-number was 5.6. FOV stands for Field of View, therefore FOV 220 means that the photo covers an angle of 220 degrees in width (or height if it's a vertical photo). The panorama size is the number of horizontal and vertical photos, for example "4x3 panorama" means 3 rows each of 4 photos were combined to make the final image. The graphic below shows some typical examples.
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