XF56 f1.2 released and specs

Started 11 months ago | Discussions thread
Caerolle
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Re: XF56 f1.2 released and specs
In reply to dark13star, 11 months ago

dark13star wrote:

Yes, exposure time is the same, given the same ISO (and yes, I realize there is a small difference in the way different managers implement the standard). Assume ISO 200 f/1.8 on both lenses, same exposure. The focal length doesn't change exposure either, at least not on the subject as measured neutral gray. What does change is the amount of other light in the scene for wider lenses.

At f 1/2 the Fuji lens can get exposures (faster shutter speed in same light) that the FF f/1.8 lens cannot.

I see this misunderstanding of exposure on the forum a lot lately. People need to go back to using hand-held light meters and setting exposures across multiple cameras to see that exposure is independent of sensor size. Depth of field will change at a given f-stop though.

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I actually tested this a while back. I set my 1/2.3" sensor compact and my full-frame camera both to the same aperture and shutter speed, and the ISO was within 1 stop.

I too used to believe that the light gathering was changed by the factor of sensor size, but it is not so: at the same aperture, no matter the sensor size, the exposure is the same, give-or-take differences in the camera meters.

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