Derrel
Mr. Rain Cloud
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- Jul 23, 2009
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Overall lens size on big lenses (meaning tele- and tele-zoom types) is a combination of lens speed (speed = maximum aperture), and telephoto factor. A true "telephoto" lens is physically shorter than its focal length. For example, there are modern telephoto lenses, like 135mm telephotos, that measure LESS THAN 135mm in length, which is what a "telephoto" lens is. There are also older designs that are very long, such as the common 500mm f/8 pre-set long focus lenses, which are exceedingly simple devices, with just a few lens elements in a slender tube. The lenses are NOT fast... f/8 has not been regarded as a "fast" lens since....oh, maybe the 1870's...
The majority of "big lenses" today are true telephoto designs, measuring a bit shorter, to quite a bit shorter, than their marked focal lengths. Take a look at these lenses, and notice that the 400mm lens has a high telephoto factor, and is just a little bit longer than the 300mm f/2.8 lens. Notice that the 300mm f/4 (third lens from left) is almost exactly the same size as the Sigma 100-300mm f/4 zoom (second from right).
Also, note that the 300mm f/2.8 (second from left) is notably longer than the 300 f/4 (third lens from left), since the optical design of the 300mm f/4 has a higher telephoto factor.
The majority of "big lenses" today are true telephoto designs, measuring a bit shorter, to quite a bit shorter, than their marked focal lengths. Take a look at these lenses, and notice that the 400mm lens has a high telephoto factor, and is just a little bit longer than the 300mm f/2.8 lens. Notice that the 300mm f/4 (third lens from left) is almost exactly the same size as the Sigma 100-300mm f/4 zoom (second from right).
Also, note that the 300mm f/2.8 (second from left) is notably longer than the 300 f/4 (third lens from left), since the optical design of the 300mm f/4 has a higher telephoto factor.
From left: The slender-barreled 400mm f/3.5 ED~IF in AiS mount with CPU added; the second lens from left is the 300mm f/2.8 AF-S Mark II;the third lens from the left is the Nikkor 300mm f/4 AF-S;fourth lens from left is the 70-200 2.8 VR-G;fifth lens from left is the 100-300mm f/4 EX HSM Sigma; far right is 80-400VR.
400/3.5 and 300/4 are shown with their built-in lens hoods in collapsed or storage orientation. All other lenses have their lens shades removed.
400/3.5 and 300/4 are shown with their built-in lens hoods in collapsed or storage orientation. All other lenses have their lens shades removed.
![[No title]](/data/xfmg/thumbnail/35/35948-700e0d840da0ca73727b1bd6d99b4142.jpg?1734167751)
