Customizable Yashica / Bay 1 lens hood
Description
This is a hood for an external Bayonet I mount on a Yashica-12 with 80mm lens with 23.3mm front glass. I made this hood to be as narrow as possible without vignetting on 56mm x 56mm film, so it would provide as much protection as possible without getting in the way of the sighting lens. If your front glass is set back further from the front of the lens assembly, or has a larger diameter, or a shorter focal length, you will need to adjust focal length, glass diameter or glass inset parameters to avoid vignetting. On my Yashica, the shutter speed and aperture knobs are very close to the lens, so I had to make the bottom of the hood pretty thin to clear them. I don't know much about optics, so I hope I computed the hood shape right. I imagined a cone with slope ratio film_radius/focal_length at each edge point of the glass, where film_radius is the radius of the (square) film at the relevant angle, and then I made sure that all these cones will fit inside the hood. I added 2mm tolerance to both dimensions of the film, too, for safety. The code uses my Bezier library for the mount tabs: https://www.thingiverse.com/thing:2207518 And it uses my tubeMesh library for morphing the shape between the bottom and top: https://www.thingiverse.com/thing:2406760
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