OK ALL YOU full frame camera fanatics

Started Nov 14, 2012 | Discussions thread
Great Bustard Forum Pro • Posts: 42,002
Re: Answer for your "understanding"

Jim Ford wrote:

Great Bustard wrote:

Jim Ford wrote:

Great Bustard wrote:

Because it is the number of photons that make up the photo, not the exposure, that determine the noise in a photo:

Errm, I was talking about lens 'speed'/aperture, not sensors or noise!

Jim

Whereas I was talking about how "lens 'speed'/aperture" relates to the visual properties of the final photo. I had assumed that the point was photography, not numbers out of context.

There are many factors that relate to "the visual properties of the final photo"

So there are.  But when we're talking about the speed of a lens, it only refers to two things:  DOF and motion blur.

You can talk about anything else you like, including what you had for breakfast, but it won't affect that fact that the the lens aperture is purely a physical property of the lens, and nothing else!

Let's talk about the aperture of the lens.  The f-ratio is the relative aperture, and the entrance pupil is the virtual aperture.  For example, a 50mm lens with a virtual aperture (entrance pupil) of 25mm will have a relative aperture (f-ratio) of 50mm / 25mm = f/2.  A 100mm lens with the same virtual aperture (entrance pupil) of 25mm will have a relative aperture (f-ratio) of 100mm / 25mm = f/4.

So, please go on about how the "lens aperture is purely a physical property of the lens, and nothing else" and how that connects to both what I said, and the visual properties of the final photo.

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