The flies over this well flogged dead horse get thicker and thicker and the horse keeps twitching.
For making moderately cropped 4x5, 5x7, 8x10 and 11x14 prints from 35mm and 4x5 negatives, the exposure correction factors for changes in magnification follow no discernible pattern. The geometric methods [either the DA correction ruler or the (M+1)^2/(m+1)^2 method] can result in answers that range from exact to 0.2 stops off from the metered values. The previous tests show the metered values are the correct values. All the meter readings and correction values are in stops.
Also included are test results with an opal diffuser over the negative. The results with the diffuser are close to identical to those with the normal Beseler condenser lamp housing. The conclusion is that the same behavior will be exhibited by diffusion, cold-light and dichroic enlargers.
The cropping is for the central 2/3's of the negative to be enlarged to the full size of the print - the central 1" for 35mm, the central 3" for 4x5.