Hello all,
Here's a head scratcher for the day, (well mine anyway).
We have a whole bunch of plates that have been shot 35mm Full Aperture on various Prime lenses. e.g . 10mm, 24mm, 50mm, 180mm
Lens Distortion Grids have been shot for these plates using exactly the same lenses (matching serial numbers), but have been shot onto 16mm.
My instant reaction is that this is wrong and will give us incorrect results when we get down to the undistortion, tracking and ultimately the line up of CG & live action.
So, I'm just curious to know whether this what's known in the industry as a technical faux pas (to put it mildly), or am I missing some basic technical savvy.
My basic, possible naive, understanding of film sizes and focal lengths would lead me to believe that you would need double the focal length to compensate for the 35mm->16mm film size difference, or that to use the same lens you would have to shimmy the filmback backwards to observe the same amount of distortion across the 16mm film.
I also assume that you would need some sort of lens conversion ring to mount a 35mm lens on a 16mm camera which would again slightly change the focal length.
Any answers/speculation/inherent knowledge & experience gladly received.
Cheers,
Adam.
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