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56 vs 90: Who is more versatile? Discuss.

Started Aug 10, 2018 | Discussions thread
Truman Prevatt
Truman Prevatt Forum Pro • Posts: 14,596
Re: 56 vs 90: Who is more versatile? Discuss.

ScottD1964 wrote:

You can always crop an image from the 56 to a 90mm perspective. Can't do that in reverse though.

Scott

Actually you can't. The axial magnification of a lens is determined by the focal length and the axial magnification of a 90 is greater than a 56. The formula is available on the internet.

The axial magnification impacts how the background looks and it looks different in a 90 and 56.  You often hear that long focal lengths "flatten" the image - which is the effect of the axial magnification.

https://photography.tutsplus.com/tutorials/exploring-how-focal-length-affects-images--photo-6508

In this series the foreground is identical ( a woman sitting on a bridge rail).  However the background is vastly different as a result of the axial magnification.

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