![]() The Otus felt the best, of course, and was probably second, but small motions of the Otus long-throw focusing ring produced large variations in the moire patterns that I was using to focus. I think the reason has to be better focus with the Batis When focusing on the Siemens star, the Batis was far and away the easiest and most repeatable in the focusing department. All four edges gave similar results, and all four edges of the not-shown f/1.8 shot we only slightly worse. The first thing that jumped out at me was the Batis f/2 number, which is slightly better (a tie, really) than the Otus. Therefore, the numbers at wide apertures should be taken with a reasonably large quantity of salt. Even with the Sony’s excellent focus aids, I have been unable to consistently duplicate on-axis MTF50 with the Otus 55 and the Otus 85. Quote Measuring on-axis performance of top-notch lenses at their optimum f-stops is hugely dependent on accurate focusing. With what is known today I would have stayed with the Batis. I ordered the Batis initially, but cancelled my order and bought the Sony 90/2.8G instead. The Batis is very good and probably matches the Otus when stopped down slightly and it has AF.The Milvus seems to be an affordable alternative to the Otus except at large aperturess.I would buy the Otus if perfect performance at f/1.4 was most important for me.while the Otus and Milvus have quite similar designs with 11 lenses, the Batis also has 11 lenses but in a different configuration. The old 85/1.4 was pretty much a simple Planar kind of lens, six lenses in a double gauss configuration. What is interesting to me is that the Otus is made to perform really excellent at f/1.4 and they have used a lot of expensive optical glass to eliminate out of focus fringing at full aperture. ![]() Jim is a scientist, so he goes on showing more curves than you ever have seen, and yes that Batis is very good. ![]() ![]() He also found that the lenses are pretty good at f/4. His test confirms the greatness of the Otus but it also confirms the goodness of the Batis. Jim Kasson made some practical tests of his own 85 mm lenses, not including the Milvus.
0 Comments
Leave a Reply. |