Ultron - better than some may think.
Ultron - better than some may think.
Summicron v4 has been great for me so far. I tried the Biogon briefly, it was an excellent lens as well, impeccable at f/2.
I'm
less enamored with the Ultron however, not very good option for the prices they go now used.
In your link - these are the issues listed with Ultron:
1.90cm closest focus distance;
2.ergonomics: you too often end up inadvertently changing the aperture while focusing;
3.the lens is prone to streaks of flare when the sun is just outside the frame;
4.it has an annoying tendency to come apart after substantial use;
5.the lens wide-open is not entirely sharp.
Well, all those are based on one user's opinion. I do agree with one general statement that applies to ALL Cosina made items (CV and Zeiss) - if you get a good one - it's very good, but they do need to have a better quality control.
Now, back to those 5 issues.:
1 - Close focus is a big issue, - fortunately - it can be adjusted to focus closer (look for my thread about that here on RFF).
2. Personal thing - I never confuse focus ring with the apreture one.
3. Flare - maybe, but I cant say that I have experienced this. Maybe I never had my lens at just that angle to the sun, but than again - many other lenses have a much worse flare problems.
4. See my general statement about Cosina. Some people report this and some never had problems. Plus since it's something that people are aware of as being a possibility - there is an easy fix. I personally never had a problem with 3 I have owned over the years.
5. Sharpness - again - if you get a good one - it's sharp. Unsharp could be an issue with those lenses that also had a wobble issue? Mine seems to be sharp enough for my taste. It's no Lux Asph, butg it's not supposed to be.
So, to me - it's a superb lens for the price.
But if you disagree with me - hey - it's your money - get a Leica or whatever if it makes you happy. All I say is based on my own experience and research. I just try share it.