Yes, I recently made my first few test frames with my SK Apo-Digitar 24XL using my Cambo WRS 1200 and IQ4-150 digital back. The IQ4 has the larger 53.4 x 40mm sensor.
The lens image circle diameter is stated as 60mm and was not designed to cover the sensor's 66.7mm diagonal, but nonetheless I was interested in seeing what the lens could do for me in tight one-shot situations.
The subject was a five-storey apartment building with panels of contrasty brickwork and textured concrete. I shot the test frames at f/8 and f/11 with the 2-stop SK centre filter IId attached.
While focusing using the live view at 100%, I was pleasantly surprised at the degree of sharpness that I was seeing across the frame.
Initially I shot with zero rear shift, then shifted the IQ4 downwards 5mm to bring the top of the building into the frame.
The images are sharp to reasonably sharp across the field at both f/8 and f/11. The softening towards the edges is only slight and would probably sharpen up easily.
In the -5mm shifted frame, even the additional image that entered the top of the frame is readily usable.
The corner cut-off has a sharp edge, which suggests that the vignette is due to the CF IId rather than the lens. The combination was never intended to cover a 53.4 x 40mm sensor. In my next tests I will try shooting without it.
In my opinion, reports of poor imaging performance from Schneider symmetrical wide lenses (such as the 24XL, 28XL and 35XL) are most likely due to Copal 0 shutters deviating from their depth specification of 20mm +/-0.025 mm. The FFD of the SK 24XL (in Copal 0) is only 26.1mm, much shorter than the 44.8mm of the retrofocus Rodenstock Digaron-S 23mm.
Rod
