Audii-Dudii
Established
To my surprise, the combination works surprisingly well (although note that I'm not as picky as some -- most? -- when it comes to corner performance, which is no doubt a factor behind my favorable opinion.) Of course, I realize this lens is NLA and fairly difficult to find on the used market, but I happen to have one and do a lot of architectural-type photography, where rise/fall come in handy, so I thought I'd give it a try...
Although the basic nature of these photos tends to hide corner and/or color shift problems, my general finding is that these pose minimal problems up to approx. 4-6mm of rise or fall. While this may not sound like a lot, it works out to approx. 20-25+% of the frame for the vertical photos I took, which is actually a fair amount.)
Here are a few samples that I took earlier this week while I was in NYC on a combo business trip/mini-vacation. Although I didn't keep a record, I know each of them used between 4-7mm of rise, as I started running into problems (color shifts and a weird cross-hatch pattern appearing) much beyond that. Oh, and before anyone mentions it, these were all lifted from my photoblog, which means they've been recompressed and converted to SRGB, so you'll have to take my word that these .jpgs don't do the .tif files I actually print from proper justice:
I also used a 28mm/f2.8 Leica R PC lens (modified with a Leitax mount) and because it was designed around Leica's longer lens register (the CV15 uses the same glass elements as the Leica version, except they're recessed into the mount further), the light rays are more telecentric. As such, it performed well for at least twice the shift the CV15 could handle (which is as much as I had occasion to use.) FWIW, I also use it with my P30+ on a Kapture Group True Wide and it covers the 44x33 sensor with no visible artifacts, so I suspect it can be shifted quite a bit further than 10mm...
Anyway, I know all of the above is likely irrelevant to anybody but myself because of the lenses I was using, but in the spirit of sharing and encouraging others to experiment with other lenses, I thought I'd pass along my experience.
P.S.: I was also very favorably impressed by the X-Pro1's long-exposure capability and am officially adopting it as my "travel camera" for those occasions when I don't want to or am unable to haul my "big rig" outfit with me.
Although the basic nature of these photos tends to hide corner and/or color shift problems, my general finding is that these pose minimal problems up to approx. 4-6mm of rise or fall. While this may not sound like a lot, it works out to approx. 20-25+% of the frame for the vertical photos I took, which is actually a fair amount.)
Here are a few samples that I took earlier this week while I was in NYC on a combo business trip/mini-vacation. Although I didn't keep a record, I know each of them used between 4-7mm of rise, as I started running into problems (color shifts and a weird cross-hatch pattern appearing) much beyond that. Oh, and before anyone mentions it, these were all lifted from my photoblog, which means they've been recompressed and converted to SRGB, so you'll have to take my word that these .jpgs don't do the .tif files I actually print from proper justice:
I also used a 28mm/f2.8 Leica R PC lens (modified with a Leitax mount) and because it was designed around Leica's longer lens register (the CV15 uses the same glass elements as the Leica version, except they're recessed into the mount further), the light rays are more telecentric. As such, it performed well for at least twice the shift the CV15 could handle (which is as much as I had occasion to use.) FWIW, I also use it with my P30+ on a Kapture Group True Wide and it covers the 44x33 sensor with no visible artifacts, so I suspect it can be shifted quite a bit further than 10mm...
Anyway, I know all of the above is likely irrelevant to anybody but myself because of the lenses I was using, but in the spirit of sharing and encouraging others to experiment with other lenses, I thought I'd pass along my experience.
P.S.: I was also very favorably impressed by the X-Pro1's long-exposure capability and am officially adopting it as my "travel camera" for those occasions when I don't want to or am unable to haul my "big rig" outfit with me.
rxmd
May contain traces of nut
44x33 is not a lot larger than 36x24, just four millimeters in each direction, so you're well within the reserves of the lens.
I have a 24mm PC lens that according to specs has a 67mm usable image circle, I have to try that on 6x4.5 one day (diagonal about 70mm), it might just barely look OK.
Nice pictures BTW!
Audii-Dudii
Established
I obviously didn't word my comments correctly, as the issue isn't one of image circle coverage per se (as you note, there should be plenty with either lens), as it how the sensor handles the light rays eminating from the rear element of the lens. The CV15 obviously has a large enough image circle to allow for more than 4-6mm of rise and fall, but the sensor can't handle any more than that without displaying nasty artifacts. For technical reasons (only a few of which I mentioned), the Leica PC lens seems to get along better with the X-Pro1's sensor and as a result, it can be shifted a larger distance than the CV15, although I haven't yet had reason to find its limits.
I have a 24mm PC lens that according to specs has a 67mm usable image circle, I have to try that on 6x4.5 one day (diagonal about 70mm), it might just barely look OK.
The only 24mm PC lens I know of was made by Olympus and if that's what you have, then lucky you! I've been looking for one at a reasonable price without any success for a while now and not too long ago, I missed one on eBay that had been converted to a Nikon F mount, which would have been perfect for my purposes ... oh, well.
Thanks for your kind words. <blushes>