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garywainwright

Digital Conversion Factor Mystery

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We all know that this is 1.6 for Canon, 1.5 for nikon. I held my friends Canon XT with 15mm EF lens (1.6x15=24mm) against my nikon film camera with a 24mm lens and the canon was significantly wider (i would estimate 21mm)
In fact my Nikon with 24mm was only fractionally wider than the XT with the kit lens at 18mm (almost 29mm in 35mm terms with the 1.6 factor).
Has anybody else noticed this?
http://www.garywainwright.co.uk

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i've got an old nikor 30-80mm f3.5-4, and a 70-300 tamron, but most of the time i borrow my brother's nikor 80-200mm f2.8 or his sigma 15-30mm aspherical f2.8. His keep me happy... mine aggrevate me. they've done well for me in the past. soon it will be time to make paper weights out of my two.

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Was it a fisheye lens? A 180 degree fisheye lens is exactly that 180 degrees diag on a FF format - no matter the mm value. That ends up being about 20mm on a rectilinear lens - not 24mm.

180/1.6, or 112.5 degrees

AOV formula - 2 x tan-1( l / (2 x f) )

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