Originally posted by tuco There are independent tests out there and they vary for one person to the next. But I shoot both the Mamyia M7II and Pentax 6x7 and get to do my own comparisons while I edit the photos. My experience finds the Mamyia lenses are damn good. I personally find the leaf shutter lenses on the M7II way better for handhold shooting. No vibration.
Yes, the Mamiya 7 lenses are superfluous and the system is definitely better engineered than the P67 when it comes to vibration. No surprises there, medium format requires large mirrors which need to be damped well. The P67 does fine outside the "danger zone" of 1/30 to 1s, particularly if you learn to use the MLU handheld. The 645 was designed with the lessons learned from the P67, and the P67ii was designed with a much better system as well. The P67 system does have the advantage of being a tiny fraction of the cost of the M7 system, boasts faster/longer lenses, as well as permits tools like polarizers and grad ND filters to be used which cannot be used easily or at all on a rangefinder. Horses for courses.
Yeah, I haven't ever seen a professional resolution test of the P67 lenses. However, my anecdotal evidence is that they are all great. I can crop my scans back to a 35mm negative size and the image is not noticeably worse than a 35mm lens. Obviously that's not a highly stringent test, but I don't think people without drum scans probably need to even bother themselves with this question to begin with. This was pro equipment back in its day, people wouldn't have used it if you couldn't crop and enlarge to a high degree. On smaller sensors, you are getting the sharpest, best-corrected area of the image. Obviously there is sample variation and not all of the lenses are equal to the later 90s-vintage lenses, but overall I really doubt they perform that significantly worse than 35mm lenses.
Someone did a test
here, on a 645D. Here's his conclusions:
Quote: Full image with this post, then crops from the following in a 2nd post: 645 55mm A, 45-85mm FA at 55mm, 67 55mm (late) and the 55-100mm 67 zoom at 55. All lenses were sharp in the center. Crops are from lower left corner. The 645A lens falls apart, the 45-85 zoom does very well and the 67 55 and 55-100 are superb. Little to choose between with the 67 lenses.
Now let's ponder the implication of that - P67 lenses are remaining sharp to the corners of a
40 megapixel digital sensor. That means that you won't have any problem if you stuck this lens on a D800 or other top-of-the-line megapixel monster. There's couple other people who chime in with their own test charts, same results.
Here's
another example with the 55-100 outresolving a Canon 5D Mark II's sensor:
Quote: The Pentax 645 and 67 lenses are the best made in this world, for medium format film, for medium format digital, and for my DSLR landscape works. The SMC coating is second to none, their 35mm/f4 is way above the Mamiya/Hasselblad offers, and my Pentax 67 prime and rooms lenses (the zooms are every bit as good or better then the primes) are my best lenses for 5DII and will be for the D3x/D700x.
A while ago I posted the test results online that irritated a lot of people since they had the stereotype that the MF lenses are less sharp than the 35mm ones even though there is no such thing in Physics. Eventually I had to post 100% pixel test chart images to show that my P67 zooms can consistently do 80 line pairs per mm to outresove my 5DII 5um sensor pitch. Then all went to silent.
Which of the Pentax 67 lenses,
specifically, do you have a problem with?