Rodenstock 55/4.5 Apo Grandagon

[Jason Denning]

Hello

Does anyone here have this lens and have an idea of the maximum usable image circle at f22 on a Rodenstock 55/4.5 Apo Grandagon. I know it's quoted as 163mm but what I want to know is what is usable outside of the 6x12 format before the image starts to blur.
I currently have a Schneider 58mm XL on my 617 camera, and the limit seems to be about a 130mm or so usable image circle before the image degrades too much, I would love to know if the Rodenstock gets any more, especially since the charts seem to indicate it being a better lens.

Any help appreciated, and if you have this lens and a 5x7 camera I would be willing to pay you to do a test for me!

Thanks

Jason

[Jason Denning]

To ad to this, it seems that on a 4x5 camera this lens is at it's max so the far corners will show up and issues I am looking for, can  anyone comment on the rodenstock with 4x5, also compared to the schneider 58mm.

Thanks

[RomanN.]

To achieve the best quality from all Super Angulon XL and rodentock apo grandagon/ same apo sironar digital lenses they must be calibrated at Schneider/Rodenstock for the shutter.
The frontelement will be calibrated with very thin rings, so the front element should never be open again to keep the best quality.
The deference between factory calibrated lens and a lens that is just puted in a shutter is at these spcial wide angel lenses really big.
All extrem wide angles: SA XL 38 mm, 47 mm, 58 mm, and A.Grandagon 55 mm should give you best sharpnes in extrem corners untill the end of the image circle.
for the 58 xl you must use aperture 22, for A.G. 55 mm aperture 16 should be enough. Both will cover full 4x5" with a little bit movement, without soft corners.
I prefer rodentock 55 that I use also for digital work at aperture 8,11,16 it is really great lens, but schneider should work at analoge in same way, otherways the lens needs calibration.
sorry for my english.

[Jason Denning]

Thanks Roman

Seems like my lens might be off as it was originally mounted in a digital shutter before I bought it.