First impressions from the S2

Started Feb 18, 2013 | Discussions thread
macjonny1
Regular MemberPosts: 147
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Re: First impressions from the S2
In reply to Daedalus2000, Feb 20, 2013

Daedalus2000 wrote:

Hi,

I know that the crop factor can be used to gives you equivalence in terms of field of view and focal length, but I am not sure you can apply it directly to the DOF calculations...

Anyway, I used the dof tables published by Leica on their website, so "calculated" was the wrong word. I "compared" the tables is the correct expression.

Thanks, D

macjonny1 wrote:

Not sure where you are getting your crop calculations. The Leica S has a .8 crop factor difference, or in other words to get an equivalent DOF you would multiply the FF camera by 1.25.

So, your 50mm f/1.4 Summilux would be equivalent IN TERMS OF DOF to a 62.5mm f/1.75 Leica S lens.

Going backwards, Your 70mm f/2.8 Leica S lens would be equivalent IN TERMS OF DOF to a 56mm f/2.24.

No need to approximate, you can get exact values from sensor comparison size.

It gives you an equivalence in terms of what the DOF would be.  We do it all the time for m43 cameras where the crop factor is 2.  Here's an example from m43 camera:

75mm f/1.8 Zukio m43 camera would give the same DOF as a 150mm f/3.6 lens

This does not mean it acts like a f/3.6 lens in terms of light performance and such it just gives what the DOF effect would be.  Ratio remains constant when converting.

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