Lowell: I have a rectangular and a round hood appropriate for each of my lenses in 43mm diagonal format.
I have also a freeware called f/calc on my home PC that
calculates angle of view and field of view for any lens focal length in any film or sensor format, including APS-c.
Perhaps I can figure out the lip height and objective diameter for a hood in APS-c, but I'm not sure about that.
Do you think it would work (although it would be tedious) to find the APS-c
angle of view for a lens, then find the closest angle of view for a shorter lens in 35mm, and use that hood on the longer lens? Like say a 35 hood on a 50 in APS-c?
If you think that would work mathematically I'll do the work and start a thread for the Forum.
There is an ebay dealer who markets "plain label" metal hoods in all lengths - might be a source.
Originally posted by Lowell Goudge not to throw a wrench into things, but any hood for an FA lens would only be partially effective on a DSLR.
The reason, the hood design would be based upon prevention if vignetting , and since the image circle is smaller on a DSLR, resulting in a reduced fierld of view, he hood will not be optimum for prevention of glare, while not causing vignetting.
I requested in a previous post, whether anyone knew of a supplier of hoods optimized for ASP-C sensors. I got no reply