When I have a problem focusing an SLR manually, I focus back and forth past the sharpest focus until I can converge on the best focus point that I can find at full aperture.
Now that the filter manufacturers have stopped making black & white contrast filters, all the filter sources have dried up except filter find. They are now my go to filter source.
I never saw HBC publish anything on the internet, so he would have been clear of that part of the law. As far as his books, then he did not have a problem publishing, today would be a different story since he would need releases from those who could be clearly identified.
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