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- Ian
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Sadly it's back at the shop now. Unscientifically, it's about the size of a modern (unextended) 24-70 2.8. The aperture was I'd say about 3/4 inch.Could you estimate the focal length and aperture diameter to get an idea as to whether it's likely to be a projector lens? Generally, projector lenses are reasonably bright, and process lenses have apertures around f/9.