From NEX 7 to OMD EM5

Started Nov 2, 2012 | Questions thread
Tenken777
Contributing MemberPosts: 503
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Re: Not true
In reply to zxaar, Nov 3, 2012

zxaar wrote:


It would help you in life if you learned to read, the length of lens is 75mm , it is not a 75mm lens.

If you actually clicked on link then you would know that it is 25mm lens as evident from the text on link itself.

Tenken777 wrote:

zxaar wrote:

Tenken777 wrote:


2.) you can't change the laws of physics, bigger sensor requires bigger lenses

Its a myth and not true.

example

m43 lense with 75mm of length.

http://www.dpreview.com/products/panasonic/lenses/panasonic_leica_25_1p4

on FF it has DOF of f2.8

50mm F2 on FF, length 43.64mm

http://www.kenrockwell.com/konica/hexar-rf/50mm.htm

covers FF but still much smaller than the above one.

-- hide signature --

::> Knowledge is mother of efficiency.

But 75mm on m43 has equivalent FL of 150mm, 50mm on FF is only 50mm, not comparable

-- hide signature --

::> Knowledge is mother of efficiency.

So you are comparing a f1.4 lens with a f2.0 lens? different aperture => different exposure, not comparable, furthermore, the link you mentioned point to a Leica M mount lens, you need an additional adaptor to fit that on to a FF camera thus adding length.  Thirdly, the f2.0 lens is manual vs. the f1.4 lens which has AF.  Therefore apple vs. orange.

But you might argue that it fits perfectly fine on a Leica M9, keep in mind that Leica designed that lens small but might have some compromises on quality.

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