Paris

by Jon

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Focal Length controls the field of view in front of the lens. A longer focal length has a narrower field of view than a shorter one. Behind the lens, it is designed to project this image to a certain size and distance, as given by camera mount specifications. So we perceive this narrower field of view as having more "reach" as you can see farther into the ...


1

So of course we all know that when we zoom in on something, it appears to get bigger and takes up more of the viewfinder/camera sensor. However, I believe this question is asking about what is called magnification factor. You most commonly see on this macro lenses where the whole point is to enlarge something that in real life is very small. The ...


1

Something the other answers don't touch on: fast f2.8 constant-aperture zoom lenses are typically the manufacturer's best, which is more than just a larger aperture. Special elements and coatings on elements are used to make these lenses better (and more expensive) than variable-aperture lenses. I'm really only familiar with the Nikon line-up, where that ...


2

The advantage of a constant aperture zoom is that you can zoom in and out as much as you like without changing exposure - it's just one less thing to worry about, that's it. A f/3.5-5.6 can gather more light at the wide end (where you can use f/3.5) then a constant aperture f/4 lens - but if you need to zoom in suddenly you have to change the ISO or shutter ...


2

Do constant-aperture lenses make a practical difference for low-light shooting, in aperture or sheet speed priority mode? If the aperture changes as you zoom in with a variable-aperture lens, the camera can always compensate by varying the shutter speed and / or ISO, so does it make a noticeable difference in practice, for low-light shooting? Many times ...


3

The technical terms and colloquial usage are a bit different here: Focal length is a technical characteristic of a lens that directly influences its angle of view, i.e. how much of the entire field of view it will project onto the sensor. Large focal length results in a small angle of view, which means the image contains less, but it's shown larger. ...


3

There seem to two things here. First is your use of the word "zoom". Most people use the word zoom to mean a lens that can change focal length. As opposed to a prime lens which has a fixed focal length. So a 300mm prime lens is not a zoom lens even though it is a fairly long (or telephoto) lens. Both the lenses you mention are zoom lenses as they can change ...



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