Jonas B Offline Upload & Sell: Off
|
Sp12 wrote:
I haven't looked at the crops yet, but do you have a Sigma 150? I hear that it's well-preferred over the Leica macros on crop bodies as it's sharper.
Ah... but one hear a lot of things. No, I don't have the Sigma 150. Heck, I can't handle a 125mm lens so an even longer one is not on my list. I also think the Sigma is an AF lens which when bought fits one camera only. As I haven't tried it I can't say anything about how it is to focus manually. Maybe it is good.
Sharper? Maybe it is but if so I don't think the difference is significant. More on that below.
Still, matching the Leica 60 is no mean feat, so if it can do that it's good enough for 90%+ of enlargements.
Edit: it matches.
Yes, the CV125 matches the Elmarit here. And, as you say, it's no mean feat.
I suspect that we see two lenses capable of handling the Nex sensor pixel density pretty well here. As resolution is the total of the lens and the sensor I don't think the Sigma can make it significantly better. I may be wrong but when people say the Sigma is sharper my first guess is that it is about contrast. My second guess is that the Sigma is sharper, but....
Interesting to see how non-APO it is.
Yup. There are two things at play here, CA and fringe. The CV125 has higher macro contrast than the Leica. Maybe that's why we see more fringe? There may be anothr reason as well. Then we have the LoCA which is much more evident here than in the images taken at longer distances.
I also took images of a metal ruler across the frame, at 1:2 and 1:1. That made it is easy to see the lateral CA as well. Interestingly it increased when going from 1:2 to 1:1. Thankfully it is well behaved and can be nearly totally adjusted for (looking at the border at 400% in ACR while playing with the sliders). I had to enter larger values for the 1:1 image. At longer distances I never bothered at all.
I don't know a lot about macros or advanced optics. Perhaps it is always this way?
Anyway, I hope all this helped one or two interested in the CV125.
Cheers,
Jonas
|