Steve Spencer
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 Re: Voigtlander 28mm f/2 Ultron II Review | |
hmzimelka wrote:
Steve Spencer wrote:
hmzimelka wrote:
RexGig0 wrote:
Fred Miranda wrote:
RexGig0 wrote:
If one wants the Ultron II to “work on a Sony,” well, a quick way to achieve the goal of mounting an Ultron II VM, in front of a high-resolution Sony sensor, without waiting while having an A7-series camera modified, is to buy a Leica M11. 
I did say “quick way,” not “inexpensive way.” (It is not that I have an M11; still trying to remain happy at the 24MP level, with the original M10, and M Type 246 Monochrom, until 2023 or 2024, or beyond.)
Nah...just get a used M240 or vanilla M10 and you will be super happy with the CV 28/2 II.
True. I already have the “vanilla” M10, and M Type 246 Monochrom. 
Having the Version III Elmarit-M, and a Summaron LTM, there is been little hurry to add a 28mm Ultron II, but, sooner or later, the f/2 aperture will be nice to have. I think I prefer the Black Paint edition.
Don't hold your breath for that f/2 aperture... its f/2.4 at best, and for all practical purposes I just treat this lens like an f/2.8 lens. There is essentially no exposure difference between f/2 and f/2.4 with exception of a slight centre hot spot.
I find on my vanilla M10 if I use f/2 and center weighted metering I do get about twice the shutter speed in aperture priority mode as when I shoot f/2.8. I don't doubt that the edges and corners are a bit underexposed at that shutter speed, but I would not call the aperture f/2.4 either.
With the exposure speed locked to one speed, and comparing the resulting images of both f/2 and f/2.4, the f/2 image is only a little brighter in a small portion of the centre. Try that with an Elmarit or a Summicron and that half stop aperture change is going to make a much larger difference.
I have tried it and it is more than a little brighter, at least on my copy. I don't want to be pedantic, but f-stop is a physical measurement not an optical measurement (that is T stop). I assume you know that. The Voigtlander lens is an f/2 by that physical measurement, and any of the summicrons I have owned (and I have owned the 50 f/2 APO, the 90 f/2 APO, and the 90 f/2 pre-APO) certainly do not have a T stop of 2.0. Almost every lens in fact has a T stop smaller than its f-stop. The Voigtlander is no different in that respect. The Voigtlander does have some serious vignetting which does affect the light transmission, but it is simply misleading to call the lens f/2.4. It is not, and unless you have the measurements then I wouldn't be calling it T 2.4, either. I doubt that is accurate. It probably is T 2.2 or T 2.25. Yes, it does have more vignetting that many other lenses and that is worth noting, but calling the lens f/2.4 is, IMO, misleading and unhelpful.
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