Originally posted by mawz The Zeiss lenses are not shipped to Germany for the final QC check, Zeiss has a QC installation at the Cosina factory which does this (Zeiss employees and equipment).
No comment on this part
Originally posted by mawz As to the ZK 100/2 Makro-Planar, it is unique in several ways.
1. It is the only K mount lens available near that focal length faster than f2.5
2. It is sharper at wide apertures and better corrected for CA than the D-FA 100/2.8
3. It is significantly better built than the D-FA or D-FA WR lenses.
Regarding
#1: For someone simply trying to fill the gap between 77mm and 135mm, you may be correct about the f2 part. However, from a macro standpoint, you lose speed at the close focus distance and given this is a 1:2 native reproduction ratio, that makes this a fast portrait tele. As far as
#2, goes, I haven't seen in formal lens tests comparing the ZK next to the D FA WR side by side.
#3 is an opinion, especially in regards to the build quality of the D-FA WR. Its aperture blades are very unique in the Pentax lineup and it is built more like a limit lens than in other current lens in the Pentax lineup plus WR. I doubt you have held one based on that statement.
Originally posted by mawz What it is is an exotic, close-focusing fast 100 with macro capabilities. The 100/2.8's cannot match the wide-aperture performance of the Makro-Planar. That said, if you don't need f2, look elsewhere, this is a specialist lens at a specialist price. The entire Zeiss ZK lineup is pretty much specialist glass. They're almost all best-in-class lenses (even the 18 and 25 are among the best lenses at their focal lengths) and some, like the 21/2.8, 35/2 and both Makro-Planars stand as among the best lenses ever made at those focal lengths. Sure they're good, but unless you need that last 5% of performance, they're probably not what you want. Especially for Pentax shooters as the Z* line is oriented entirely towards FF shooters.
No one is arguing that they aren't excellent or well made. But for the prices, they damn well better be.
Originally posted by mawz The D-FA and D-FA WR 100/2.8 Macro's are quite good lenses, but they do not perform at the same level as the CV APO-Lanthar 125mm f2.5 or the Makro-Planar 100/2. If you want that level of performance from a Pentax macro, get one of the 200/4's. Of course that's gonna cost similar money to what an APO-Lanthar or a Makro-Planar cost.
Why did yo slop the out of production APO-Lanthar in and the Pentax 200/4 lenses in here? This thread has been about the current production ZK and focal length counter parts. You low mouth the WR for being f2.8 and then offer up an f2.5 and f4 as an alternative for native 1:1 lenses.
All of these lenses in this post are the top guns and what it comes down to is the end use of the user and personal preference. It essentially comes down to that and what one is willing to pay for them. None of these lenses are cheap
per se. Some times people need to remember that there are differences in fact and opinion. Factor in personal preference and art and it isn't so cut and dry.
My perspective in this particular lens is from a macro perspective. f2 at 1:1 and ~12" would be a seriously thin DOF. If I were using it at a short tele, I'd just go with my FA 77.