How many feet is a 300 mm lens?

Answer 1

Most lenses with a focal length of more than 200mm are commonly used for shooting sports and wildlife. A long telephoto lens -- in conjunction with a large aperture -- also has the side-effect of producing an exceptionally smooth background blur.

Answer 2

In Photography we never talk about 3X or 4X magnification and it's a telephoto not a telescopic lens. A lens with a given focal length on a given camera gives a certain view which may be:

"normal" = approximately the same perception as the human eye
"telephoto" = reaches out and just selects a part of the scene compared with a normal lens.
"wideangle" = crams more into the image than a normal view

18mm = moderate wide-angle, useful for buildings & landscapes
28mm = normal, useful for groups and general photography
55mm = moderate telephoto, useful for doing a waist-upwards portrait of a single person sitting 2 metres away

If you add a 70-300mm zoom then you add the following focal lengths and all the others in between:

70mm = telephoto, useful for head and shoulders portait
135mm = long telephoto, tight head shot
200mm and upwards = extreme telephoto, useful for wildlife, sports, etc.

If you take 300mm and divide by 70mm you get about 4.3X. This isn't a "magnification" factor tho. It only means that at 300mm you are shooting at a focal length that is 4.3 times longer than the shortest focal length (70mm) of that lens.
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The related link below tells you how to calculate magnification for lenses used in a variety of ways (microscopes, telescopes etc.).

Answer 3

A 300mm lens is a telephoto lens, which will magnify the subject. It used to be that a 300mm lens was actually 300mm long, but with the use of compound lenses, they can be shorter, but have a "virtual" length of 300mm.

On a 35mm camera, about 50mm is the "natural" lens size -- most cameras come with a 50mm lens. You can divide 300mm by 50mm to find out how much it magnifies from the "natural" position. 300/50 = 6, so it will magnify 6 times.

Answer 4

1 foot equals 304.8mm so roughly just one