Multiplication factor for M Lenses

[DAVIDMC100]

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Hello all. I just ordered a CL ! I'm going to use my M lenses on it. I have  35, 50, and 90 mm Summicrons. Will the APS-C sensor size effect make them work like 47, 75 and 135 mm ?

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[M11 for me]

1.5 is the multiplier. So you are right with your focal lengths.

Actually you are right too with saying "make them work like". Of course the focal length of an existing lens stay unchanged. 

By the way 35 x 1.5 equals 53mm not 47. And note that the lenses you have are not exactly the focal length that is written on the body. It is aprox. that focal length.

Edited January 24, 2019 by Alex U.

[ramarren]

Yes. In effect if you want the same wide FoV as you have for an M, you'll need an additional 24mm lens. 

[Trivette]

The crop factor (1.5 in this case) does not change the focal length, but it changes the field of view. Therefore, for example, a 35mm lens will have approximately the same field of view as a 53mm lens on a so-called "full frame" camera.

[jaapv]

Actually it does not really change the field of view, as that depends on the subject distance. Move backwards with a cropped sensor and you'll have the same field of view, albeit with a different perspective.

Sensor crop changes the angle of view.

[nicci78]

Multiple focal length and aperture x1.5 to get an idea of the lens will look like on APS-C. Field of view and depth of field wise. 

It is just that simple. No need to know read the scientific fine prints.

Summilux-TL 1.4/35mm mounted on a CL will look like a 2,.1/53mm wide open. Close enough to a Summicron-M 2/50mm mounted on a M10. Actually almost all 50mm are 52mm, just rounded to 50mm, for marketing sake. 

[johntobias]

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I guess the answer is better get a w-i-d-e angle.....?21mm perhaps

 

[ramarren]

15 hours ago, johntobias said:

I guess the answer is better get a w-i-d-e angle.....?21mm perhaps

 

If you like to shoot with very wide angle lenses, 21mm isn't a particularly wide focal length on APS-C. That's why Leica makes the TL11-23mm lens for the APS-C line... 

[lct]

On 1/25/2019 at 4:45 PM, johntobias said:

I guess the answer is better get a w-i-d-e angle.....?21mm perhaps

15mm x 1.5 = 22mm on the CL. CV 15/4.5 v2 here (Summilux 35/1.4 v2 in the background)

 

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