Assuming a 6.25Ē or greater projection width, that gives at least 2.9X. Thatís within the 2X-10X magnification range stated by Rodenstock for its late model 4/80mm Rodagon. That should be identical for the 5.6/80 CE Rokkor.
If thereís nothing wrong with the lens (most likely the case), then any dissatisfaction with the print quality is due to some other factor. In the cases Iíve investigated, the cause is most often the negative moving during the exposure as it absorbs heat from the light passing through it. We counter this with a heat-absorbing glass filter, a glass carrier to keep the negative flat, or both.
The negative heating I refer to usually only results in the negative getting somewhat warmer than the surrounding part of the negative held by the carrier. It doesnít take a great deal of temperature difference to make the negative move out of the shallow depth of focus about the plane of focus.
Most enlarging lenses produce their best image quality closed 2-3 stops.
Last edited by Ian C; 04-08-2012 at 12:40 PM. Click to view previous post history.