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-   Sony NEX-EA50 (all variants) (https://www.dvinfo.net/forum/sony-nex-ea50-all-variants/)
-   -   Sigma 18-35 F1.8 -Absolute Magic! (https://www.dvinfo.net/forum/sony-nex-ea50-all-variants/522831-sigma-18-35-f1-8-absolute-magic.html)

Robert Benda November 13th, 2014 10:41 PM
Re: Sigma 18-35 F1.8 -Absolute Magic!
 
Quote:
Originally Posted by Noa Put (Post 1867486)
You are not understanding it right, what he compares in the video is the difference between full frame, aps-c and m4/3 sensors which all have different cropfactors giving you a different frame on the same lens and which also affects the dof and how shallow that will be. No matter what type of lens you put on your camera, f1.4 stays 1.4, it will not be more light sensitive.
Except that, because a crop factor has a smaller sensor, and thus reads less light, if you wanted the same exposure settings, the same brightness to your image, you'd still have to factor the crop factor on your aperture or ISO.

All other things being equal, my 5d Mark ii at f/4 will be about the same amount of light on the metering as my 70D at f/2.8. Or I can set both their apertures the same ad up the ISO on my 70D.

Tom Van den Berghe November 14th, 2014 12:49 AM
Re: Sigma 18-35 F1.8 -Absolute Magic!
 
but why can handle the nex-ea50 higher iso/gains without adding too much noise?
It's a APS-C sensor but with (too) many pixels on it -> pixels are smaller.

Noa Put November 14th, 2014 01:55 AM
Re: Sigma 18-35 F1.8 -Absolute Magic!
 
Quote:
Originally Posted by Robert Benda (Post 1867713)
Except that, because a crop factor has a smaller sensor
That was not my point, Tom thought the cropfactor applied to the aperture if you would use a full frame vs a non full frame lens on the same camera.

Robert Benda November 14th, 2014 06:51 AM
Re: Sigma 18-35 F1.8 -Absolute Magic!
 
Quote:
Originally Posted by Noa Put (Post 1867721)
That was not my point, Tom thought the cropfactor applied to the aperture if you would use a full frame vs a non full frame lens on the same camera.
Doesn't it? To achieve all the same results between the two cameras (amount of light, DOF) you can't leave the aperture the same.

Noa Put November 14th, 2014 07:44 AM
Re: Sigma 18-35 F1.8 -Absolute Magic!
 
No it doesn't, I said on the same camera. Tom thought that a full frame lens vs a non full frame lens on his camera would give him better low light performance if both where set at the same f-stop.


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