Coverage information provided by the lens manufacturer, and what you see in many charts, is nearly always based on, 1) use of the lens at f/16 or f/22 and, 2) for projection printing where an enlargment of 4X-10X is anticipated. In ULF work we usually think of coverage in terms of contact printing, i.e. no enlargement, and use of the lens at f/45 or f/64, which with many designs increases the useful angle of coverage.
Originally Posted by Petzi
If you were to rely solely on the charts you would have no idea that the 450 Nikkor-M covers 12X20 with many inches of movement, or that the 355 G-Claron covers 12X20. But both of these lenses are very popular with users of this format. The same is true of many other lenses, so if you want to know if a given lens will cover your format, beteter to ask someone who work with the format before wasting your time with the charts.
Last edited by sanking; 04-03-2006 at 06:32 PM. Click to view previous post history.