Photography

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A place to politely discuss the tools, technique and culture of photography.

This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.

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does full frame has benefits ob shutter speed on equivalent focal length and aperture? (alien.top)

submitted 11 months ago by Parking_Association4@alien.top to c/photography@viewfinder.pro

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it is said that full frame aperture equivalent of 2.8 to aps-c is 4.2. does it mean that shutter speed of aps-c is one stop slower that full frame on the same aperture? given the same focal length equivalent e.g. aps-c 23mm and ff 35mm.

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[–] oldlurker114@alien.top 1 points 11 months ago

An f/2.8 lens will shoot as fast as f/2.8 does, no matter what you put it on.

But what is this "speed" or "fastness"? The f-number is not just some abstract unit, but it's tied to physical reality.

To answer to that one needs to understand that this "fastness" refers to an exposure time (or shutter speed) one can use to achieve desired image quality. Thus f/2.8 on one format does not equal f/2.8 on another.

In principle f/4.2 on FF, f/2.8 on APS-C do an identical job - they give the same image quality (noisewise) with the same exposure time, the depth of field is the same and the blur from diffraction will be the same.