I thought you were a native speaker of English.
See https://www.merriam-webster.com/dictionary/dandle
Oren,
While true Schneider did make the Super Angulon XL 38mm. It has an image circle listed by Schneider of 137mm at f/22. While that does not cover the 4x5 format I have always found Schneider's coverage estimates conservative. I have all of the Schneider Super Angulon XL series and for the 38mm I find if you stop all the way down (I don't have the lens in front of me but if memory serves it's f/32) and use no movements just the corners of the film start to fall off. So yes you are correct, the Super Angulon XL 47mm is the widest lens with legitimate coverage for 4x5, but there are a few other options if you can work with slightly less than 4x5 coverage.
-Joshua
I agree Joshua. Also, if one crops to a very slightly narrower ratio similar to 6x9 but using the full 5" width of the film it definitely illuminates that much. That's only about 147mm. It's pushing the lens' limits so may degrade a tiny bit in the far corners but it usually doesn't matter way out there. If you intend to crop a bit narrower than 4x5 and need the widest modern lens available the the 38mm XL is the answer. I don't know if the 35mm Apo Grandagon can be pushed that far.
In my testing of the 38mm XL, I found that cropping the slight vignetting on a full 4x5 sheet to the same aspect ratio resulted in just the FoV of the 47mm XL. But indeed, utilizing a different aspect ratio can net non-vignetted results with a slightly wider FoV. It certainly is the widest square image ever when used at a 4x4 crop. On 6x12 it is quite a lens.
On a side-note, I find it interesting that modern lens design for 35mm film or digital has surpassed the 38mm XL for widest lens ever. Even if you crop the 38mm XL to a 2x3 ratio, it's only about as wide as the 12mm Voigtlander. They recently now came out with the 10mm Voigtlander which is even wider.
I hope that one day you can try the 10mm lens. The first thing you should notice is how very large it is compared to other wide lenses for 35mm. I hope someone more knowledgeable can tell us whether its construction helps defeat the problems from angular projection of the rear lens to film/sensor.
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