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Variable length viewfinders which provide constant focus, magnification and pupil conjugate stability, in motion picture camera systems employing different size zoom lens objectives, are described.
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Iain A. Neil, "Variable-length viewfinders with pupil-conjugate stability," Proc. SPIE 4487, Zoom Lenses III, (14 December 2001); https://doi.org/10.1117/12.450420