8/13/2019 Matching a Horizontal Nikon D200 to a Maya Lens

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digital ArtformObservations, experiments and rants on the production and practice of digital art. The open notebooks of Joseph Francis.

Matching a Horizontal Nikon D200 to a Maya LensMarch 21, 2009 10:52 PM

A Nikon D200 uses a standard DX size sensor. (23.6 x 15.8 mm)

Maya's 'film' is described by two measurement: Horizontal Film Aperture andVerticalFilm Aperture

According to Nikon's online documentation:

Horizontal Film Aperture andVertical Film Aperture are the height and width of thecamera's aperture or film back, measured in inches. The Camera Aperture attributedetermines the relationship between the Focal Length attribute and theAngle of Viewattribute.The default values are 1.417 and 0.945.

---

Now, why Maya uses the word 'aperture' to describe this should have been my first cluethat something was wrong, but I always assumed that Maya's default camera mimicked

4-perf movie film, just like most people shoot and project. It would have been theobvious thing for them to have done.

Turns out I was wrong.

All these years Maya masked its values by expressing them in inches, and all these yearsI never bothered to check the math, but it turns out that Maya's default width, the

mysterious1.417 works out to be 36mm.

All these years Maya has been modeling an 8-perf camera as its default. As if it were a'full frame' still camera like a Nikon D700 or a Canon 5D Mark 2

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8/13/2019 Matching a Horizontal Nikon D200 to a Maya Lens

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...or as if it were Vistavision.

So to match a horizontal D200 to a Maya camera, set the

Horizontal Film Aperture = 0.929133858, which is 23.6 mm in inchesVertical Film Aperture = 0.622047244, which is 15.8 mm in inches

Then your Nikon D200 lens should match your Maya lens.

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A 'full frame' Nikon D700 has a chip size of 36 mm x 23.9 mm.

At 1.417" x 0.945" Maya's default camera back equates to 36 mm x 24 mm. So Mayadefault cameras equate directly to Nikon D700 lenses.

Categories: 3D Computer Graphics, Digital Photography

Tags: Canon 5D, D200, D700, DX, DX chip, DX lens, focal length, full frame, lens, Maya, Nikon

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