SLR camera lens thickness, what is the difference!
For the masses is more big and thick eyebrows and this is another matter, but when you play the humanities when we must avoid silly big black and thick.
4, special needs: the same full phase of the phase field and no anti-shake, Sigma 50 1.4 than Canon and Nikon's thick circle, filter size 77, the benefits of caliber is a little better performance, but some people like the caliber eclipse. Anyway, do not know how to think of Sigma, may be prepared to pretend to prepare, I do not like this head, people 200 to grams your weight more than you, if you are a D3, Malaysia and the like Even if, get hold of the entry behind the heavy foot of the experts to see a smile.
In summary, the "rough" just gave the lens a space, the same focal length of the lens thicker than the thin easier to do better, but does not mean that the lens is better than the fine lens, the specific problems have to be specific analysis, Such as Sigma 1020 second generation 82mm, Tuli 1116 is 77mm, which we have a good heart, and Lycra, Fulunda and so on a few 0.95 lens which they are not thick.
3, anti-shake components, ring-shaped focus motor, electric zoom and other modern machinery and equipment: the old film lenses are no anti-shake, manual zoom, manual focus, manual aperture, and now digital SLR lenses are generally auto focus, , And some anti-shake and electronic control zoom, which are to occupy the space, especially the ring-shaped motor certainly a rough circle, so you see Nikon's lens to know, the same focal length of the same aperture G head than D head Thick circle, because the G head more than a focus motor.
2, the phase field size: In order to cover the phase field has enough imaging lens lens group also have a corresponding diameter, so the common frame in the frame full size, full width than C, C width of 43, and so on Such push To the DC nail cover so big phase field or even periscope lens is enough, 1-2 mm thickness 3-4 times the zoom lens are not elongated.
he lens thickness is related to the following aspects, but not limited to the following aspects, only pick up my moment to think about it:
1, aperture size: aperture F value is the lens focal length and aperture diameter ratio, the longer the focal length, aperture F value is smaller, the larger the aperture diameter, since the aperture diameter is clear that the lens is fine. So the general telephoto than the standard focal lengths thick, large aperture lens than the small aperture lens rough. (Can ask this question you can also estimate that the food may be, focal length, aperture and so on the basic terms are not clear, to check their own)
