XF56 f1.2 released and specs

Started 6 months ago | Discussions thread
viking79
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Re: XF56 f1.2 released and specs
In reply to Robert Garcia NYC, 6 months ago

Robert Garcia NYC wrote:

not really your not factoring in the extra real estate on the sensor, which is gathering light. So, it's an f 1.8.

No, f/stop and focal length are physical properties of the lens that never change on any sensor size.

f/1.2 means at the same shutter speed on any system means the intensity and duration of the light will be the same.  The exposure of the sensor will be the same.  Ignoring transmission losses.

However, the larger sensor catches more total light, hence the term equivalent.  This lens is about equivalent to an 85mm f/1.8 used on full frame.

Amount of light available for autofocus on the 56mm f/1.2 will in fact be greater.  The downside with large sensors is you start to get very dim viewfinders.  Look at old view cameras, very little light to focus with.

Eric

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