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100% crops with H4D-50, 6 micrometer pixels. Normal USM sharpening applied, same processing on all crops. No lens corrections etc.Can you clarify the sizes of these? Are they all 100% crops?
Thanks!
Due to the variable nature of medium format digital sensors, high quality optics, and the movements a user might want to inform the components with, we find ourselves in an evaluative and educational position with our clients on a daily basis. Sensor position within the image circle of a lens brings about situations where limitations are revealed, and flaws exposed. Part of prescribing the right combination of these products is a thorough understanding of the performance. What we were truly interested in was how Alpa evaluates the lenses they receive from Schneider and Rodenstock, and does their evaluation offer any advantage over buying the same lenses off the shelf?ALPA is said to have custom calibration of their lenses. Anyone who knows who does that, and if it has any effect, or if it's just market speak?
Yes I too find that to be the only reasonable explanation, otherwise 1 out of 10 bad would be a total failure of the manufacturing line.I'm sure that Alpa's rejected lenses are all within manufacturers specs.
The thing I have most difficult to accept is that Schneider-Kreuznach said they couldn't remount the lens even if I paid for it. With my Linhof body and my digital back I can send it in for service and recalibration at a fee, no questions asked They take it apart and put it together again to the best possible precision they can.And don't forget, just shipping one of these lenses could cause problems, especially with a 32 Rodenstock, if not packed well it could very easily have a problem, especially if going overseas. The 60mm, less so, but it still could happen.
Your explanation is reasonable but it is not the only reasonable explanation.1 out of 10 bad copies would for most products be considered a very poor result, so the only reasonable explanation is that the manufacturer have wider tolerances.
Not necessarily.If they are resold without further action it means that non-ALPA lenses are bad more often than 1 out of 10...
Not quite - S/K mount the lenses in their helicals and then on the Alpa mounts; they then send them to Alpa who carry out their own QC* before sending on to the end user or dealer.So to get this straight...