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Paul,
Glad you liked it. As I said above, it was one of those "out of the corner of my eye" shots.
. Like so many other have said here, I'm having a lot of fun with this camera.
I think I know just how you feel. It is the bane of digital photography in my opinion. Back when I got my first DSLR I had been using 35mm and 4x5 for some time and quite like the look of my 21mm 24mm (and 75mm, 90mm on the 4x5) but was disappointed at how wide looks on the smaller formats.
As you can see, I'm using the NLA F-mount version of the CV 12mm/f5.6 and most of the time, it works very, very well. Occasionally, though, there is some vignetting and smearing of image detail in the corners ... haven't yet figured out why this happens or happens only occasionally, but as I said, for most of the images I capture with it, this isn't a problem.
I think it's because the microlenses on the sensor don't like accepting such oblique light rays--the lens was designed for film, which is a much more forgiving medium, in terms of the angle of light. My M-mount wides are all soft at the corners on m4/3ds; 50 and up is good, though.
I understand this well enough. What I don't understand, though, is why this is only an issue occasionally, as the majority of my photos taken with the CV 12mm are sharp out to the edges and evidence only minimal vignetting in the corners.
I tried a lot of legacy lenses with my G1. Smeared (or whatever) corners were common with wide angle lenses. The problem sometimes went away when i stopped down a fair bit.
Some of them are still top IQ (and top values), like the 20mm, the 55mm Micro or the 105mm/2.5
"Wide-open" on the CV 12mm means f5.6 and Yes, the smeared corners occur frequently when it's used at this aperture. I almost always stop down to f8, though, and as I noted above, I find that they're rarely a problem at this aperture.
Then there is no need to be puzzled anymore... But "rarely" - does that mean you still got smeared corners from time to time also at f/8?
Yes, that's exactly what I meant. Sometimes I do, but most times I don't...
Hmm. It seem to have to do with the aperture in a way at least then. Why you still sometimes get smeared borders and corners at f/8 beats me. Sorry. I understand it must be annoying from time to time. The short register distance causes some problems in general, that's what I think.
I have to agree, the 105 f2.5 does quite nicely. So does the 75-150 series E, but it feels a bit unwieldy. I haven't tried my 24m f2.8, 35 f2, or 50 f1.8 yet. The 45 f2.8 pancake also does quite well.
I find the 105 f2.5 a little heavy and bulky and has a bit too much zoom once coupled to an adaptor. I prefer the 85 f2, quite compact and light. The micro 55 f3.5 works well to. Haven't tried my 35 and 50 much yet but will.
