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New Rodenstock HRSW coming - 135/140mm!
- Thread starter narikin
- Start date
dchew
Well-known member
The partial reason is that the diffraction gets worse as you stop down. But if you are only making a small reproduction it may be satisfactory for an 8x10 for instance, but not for 13x19... Their Aperture recommendation is by engineers who may not even photograph.
Also which DB is one using?
One can get by easily at F 11.5 with a 50mp or 60mp back, but an 80mp pushes you back to F8.5 as a limit.
I just tested a 100mp back at F11 and F8. The F8 was far better, even when diffraction software was applied.
The finer the pixel, the quicker the diffraction shows up as one closes down.
Just some thoughts.
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These lenses with their 110mm image circle are made for stitching, shifting, tilting. So you are using the extended image circle, not simply the center.
F5.6 is fine theoretically for the center, but if you are using the edges you need to go to f8 at least. The trade off is very much worth it. Edge performance improves dramatically as you move up by one stop. 2 is borderline. Above f11 and the central loss is too much, for sure.
It's a trade off in other words. Center vs edges. I settled on around f8, speaking as a regular 90 hrsw user. (4 way stitches w Alpa Max).
F5.6 is fine theoretically for the center, but if you are using the edges you need to go to f8 at least. The trade off is very much worth it. Edge performance improves dramatically as you move up by one stop. 2 is borderline. Above f11 and the central loss is too much, for sure.
It's a trade off in other words. Center vs edges. I settled on around f8, speaking as a regular 90 hrsw user. (4 way stitches w Alpa Max).
Someone in the know told me LAST YEAR that such a lens will be introduced at photokina 2018. Was generally known in the industry.
Made sense since the Apo-Macro-Sironar digital 120 mm f/5,6 is no longer available.
That's as may be, but unless you post it here, for all to read, "someone told me" doesn't count!
Care to tell us exactly what will be at Photokina 2019? I'd love to know...
