Originally posted by zzeitg One question from my side.
In the review, there was information that the lens has KA mount. But there's something strange.
In case of other KA lenses I switch the camera to aperture priority mode and I am allowed to set the lens's aperture by the body.
But in case of this Irix lens, this does not work. When I move with the aperture control wheel, I can see that the time value changes instead. But there remains f2.8 in the aperture window.
Is this behaviour the same in your case, or could there be something wrong with my lens?
(I've tried it on my K-7 so far.)
EDIT: So I've attached the lens to KP and everything seems to be as it should.
So now I'm wondering what's different in case of K-7. Obviously there must be some compatibility issue?
I just purchased this lens today via a private sale. The one thing I can confirm, because I tested it before purchasing due to having read this thread, is that my K-7 does read the lens properly. No hesitation. I have full aperture control in both M and Av, which is all I use 99% of the time. I suspected this would be the case, and that the situation is probably one of some defective copies escaping Irix's QA. I'm speculating, but I can confirm that there's no reproducible compatibility issue between this lens and the K-7. Here's hoping Irix addresses these issues because based on my initial impressions of having the lens in my hands, I want this company to prosper and make more offerings.
The lens looks amazing, as good as in the pictures here. I intend to get outside with it tomorrow, and I look forward to adding some content to this thread as soon as I have something worthy. This is my annual gear upgrade, so I intend to use the hell out of it this summer.
As others have noted, this lens has some heft to it. I think people make too much of this issue (with many things beyond lenses), but I also enjoy hiking with some weight and I accept not everybody does, or can.. It feels well balanced to me, and I don't think its weight will present any problem for handheld use. I find the stance (I forget what it's called) where you keep your left elbow folded in to your body to form a bracket supporting the camera to be helpful, but I'm still programming myself to remember to do it properly.
Oh, and one other thing I can confirm is that there is no vignetting issue apparent when using my trusty old Vivitar Macroflash 5000 ring flash (yes, it looks funny, but it works). I was concerned about this because of the whopping 77mm filter thread on the Irix, while the largest adapter for my ring flash is 55mm. I put it on step rings and in some initial test shots all appears evenly lit. This is an important aspect for me, so I figure it might be helpful to others here to know it can work. I can measure the approximate aperture of the ring flash and the distance between the filter thread and the flash unit (with the step rings) if anybody needs the numbers to compare to their model.