In my usual preparation for some astronomical star field shots, part of experiments in film preexposure, I wanted to set the focus between a calculated hyperfocal distance and ∞ so that I know I'd have an optimal focus and not have to rely on setting the focus by eye. First off, all my lenses focus beyond ∞, which is why I decided to pursue the hyperfocal distance route. That's no big deal, a quick and dirty bunch of calculations in a spread sheet has that done. Now the problem comes from my lenses, No Numbers !! :eek: At least not where I need them to be ! The "on lens" focal scale for my normal to wide angle lenses runs from 1m or 2m straight to ∞ ! :eek: The best lens is my old Sigma 70-300 Macro Zoom ( it was a kit lens with my SA9 ) that at least goes from 8m to ∞. First Question: How do I set the focus of my 28mm lens set at f/1.8 between the hyperfocal distance of 87m and ∞ ? Especially when the lens can focus beyond ∞ and I know the scale itself may not be entirely accurate. If the lens focal adjust ring stopped right at ∞, this would be a non-issue. Note: The hyperfocal distance comes from calculating for a Circle of Confusion of 5um, for my needs the standard 30um is too large. For a star field astronomical photo, a smaller Circle of Confusion means the film can image fainter stars. Equivalent to going from ISO 200 to over ISO 1000. Second Question: When did lens design and lens manufacturers so extremely compress the ∞ end of the focal scale ? I know the scale is logarithmic, but 1m to ∞ is a bit much.