Size comparison of FE 4/2470 on A7 vs Olympus 12-40 f2.8 on GX7

Started Feb 6, 2014 | Discussions thread
viking79 Forum Pro • Posts: 14,137
Re: Here is a real comparison

Lab D wrote:

edwardaneal wrote:

it would be a better comparison if you didn't have the lens hood reversed on one lens and no hood on the other - I would suspect the lens would look smaller without the hood.

I may get flamed for this, but this is a better/fair comparison of 2 lenses with the same range and no lens hoods to make one look bigger.,289.336,ha,t

I am still wondering why we are comparing a 12-35 or 12-40mm f/2.8 with a 24-70mm f/4, they are very different focal lengths and entrance pupil sizes.

(all figures approximate since I am using rounded off aperture values and marked focal lengths of the lenses)

12-35/40 mm f/2.8 is 12-35/40 mm with 4.3 to 12.5-14.3 mm entrance pupil and 24-70mm f/4 is 6 to 17.5 mm entrance pupil.

In terms of aperture stop area the 12-35/40 is 57 mm^2 to 490-641 mm^2, and the 24-70mm f/4 is from 114 mm^2 to 962 mm^2.

Of course the lens with twice as large of aperture stop is going to be larger.


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