Is this calculation relevant in the real world?
Are there any digital wide angle lenses with an image circle greater than 113mm? (SK Apo-Digitar 47XL).
... of course you could use a 5 * 4 LF lens, but that would me a waste of the res of a high res back.
Yes, Doug, I was aware of the SK Apo-Digitar 60mm (and it is on my wish list) but is is a standard lens, not a Wide Angle, as the focal length is about the diagonal of most MFD formats.Schneider 60XL (wicked sharp even at 5.2 microns) has an image circle of 120mm. Not quite there, but very well may be close enough.
...there is, of course, nothing to prevent you producing 3:1 aspect ratio pictures with any focal length, including the 180mm and 210mm SK Apo-Digitars which also have 120mm image circles.