ashmadux
Art Director, Visual Artist, Freelance Photography
chromophore said:I hate to rain on the parade, but let's dial back the excitement several notches and look at things more objectively. There have been a number of questions asked and speculations made that I think need to be carefully addressed.
First, the comparison of MTF curves. The published curves are not comparable to any other curves (especially those actually produced from measurements of production lenses of other manufacturers) except for Canon's other published curves. That is to say, you can compare the 35/1.4L against the 35/1.4L II curves when they come from Canon, but you should not compare the Sigma curves against the Canon.
The curves that Canon produces are theoretical (as we should all know by now) in the sense that they are based on ray tracing simulated lenses and calculating the resulting spot diagrams. The most important thing to keep in mind is that these are a (reasonably good) guideline but not what you will necessarily achieve with a production lens.
Second, the BR element/technology. This is very promising. I do not think there will be longevity issues--that it is made of organic material doesn't necessarily mean it will degrade over time, but here we can only trust that Canon has tested the technology and decided it is stable enough for use in a camera system over the lifetime of the lens.
Third, your best indicator of performance at this time is the sample images. Don't look at the MTF curves for now: wait until measured MTF curves are made. Right now, sample images are the proof of performance that we should look for. The ones I've seen look very impressive. Chromatic aberration is much better controlled than in the previous design, without a doubt. It is not entirely absent, however. We are still lacking in the following types of samples: (1) shots taken at f/1.4 with low subject magnification: this is to reveal the bokeh at intermediate, non-macro scales; (2) shots taken at f/1.4 at infinity focus, of stars: this is to reveal the existence of coma wide open; (3) series of shots taken at f/1.4 to f/2 in high contrast situations: this is to reveal any spherical aberration, residual chromatic aberration, and focus shift. I can only assume that with the level of excitement over this lens, these samples will be coming VERY soon.
I'm excited but I'm not dropping $1800 on a lens that I can't yet quantify how much improvement exists.
This guy. ^^ Smart stuff there, thanks for that
Upvote
0