Some lenses, because of a design that includes uncorrected spherical aberration, shift their plane of focus backwards as the aperture is narrowed. This is most apparent at close focusing distances and mid-to-wide apertures, but is not a defect and these lenses can have wonderful rendering.
But what techniques, approaches, or methods have people learned to compensate for the shift? Or do people even bother?
I ask because I feel the urge to load some film into my rangefinder and take my Zeiss ZM C-Sonnar 1,5/50 out for a spin, and this lens absolutely shows these characteristics but I need to work with it 'blind'. However, there are also some excellent lenses for digital cameras that exhibit focus shift, so I'm interested in that experience as well.