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How can Sigma make sure the FFF is the best success it can be? Locked

Started 3 months ago | Discussions thread
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Tom Schum
Tom Schum Forum Pro • Posts: 13,282
Re: How can Sigma make sure the FFF is the best success it can be?

Scottelly wrote:

Of course, full-frame refers to a frame of 35mm film, but the sensors are actually approximately 36mm.

Adding to the confusion, and isn't it fun to do so:  The width of 35mm film is 1.372 inches or 34.85mm.  The width of the slot at the film plane in a 35mm camera is about 1.382 inches or 35.1mm. So they call it 35mm just to be simple.

The size of the image area on a 35mm camera is 0.942 x 1.416 inches or 23.92 x 35.97 mm (all dimensions taken from Sigma SA-7n camera).

So we say full frame is 24x36mm, which is an aspect ratio of 2x3.  Movies were using half of this image area, 18x24mm, which is an aspect ratio of 3x4.  Oskar Barnack decided to rotate the baseline so you could hold his camera like normal people do, instead of have it vertical like a movie camera, and then he wanted to make the image size as big as possible so he made it the size of two movie frames, just to keep things simple and not too hard on the lens optically.

So, full frame is maybe a crop of half-frame, which was the original image size in this format.

APS-C is something like half frame but not quite.  Leave it to Kodak...

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Tom Schum
"Beware of taking advice from anonymous wise men." Quote from Anon.

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