I drove over to CRIS this afternoon and picked up my camera and lens. They were all ready, right on time as they indicated. The notes on the service form indicated that they adjusted optimum resolution focal point, cleaned and checked to manufacturer's specifications. The camera body was used for testing purposes only.
I took some pictures after I got home, of the same scene as I did on Monday. I am trying to past them side by side for easier comparison. Resolution did not change - Not getting the sharpness of an 85mm lens at 8mm. That was not an expectation. I usually never really pixel peep, but it does appear that the individual pixels of the infamous fire hydrant were a bit better defined by what 10~15%. I have no quantitative way of measuring that - so it is pure speculation.
- Am I happy with the results - Absolutely! Its as good as its ever going to get. The leaves on the Ocotillo are now sharp as opposed to being blurry blobs. The lens no longer focuses beyond infinity.
- Did I learn something - Sure did - and it was all positive. In talking with the girl at the front counter, she was saying that they get a lot of Sigma in that is within a week or two of purchase, for "tuning" - but once they are set up, then seem to never come back. On Wednesday, they said, that they needed to check to make sure that they had everything that they needed, since "we don't see too many K mounts, and this is the first 8-16 in a Pentax mount we have seen".
- CRIS put a rush on this for me - and for that I am very appreciative of their additional effort.
- It was all done under Sigma's warranty.
- They did have to set my camera up for the calibration of the lens, so now I am going back and trying to remember all the items that I had set. I think I have most of them. But still now want to run each lens I am going to take with me so that I have no surprises. I had to re-enable the manual aperture ring.
- Did it make a noticeable difference? When you look at the entire frame, I doubt that you can see it, however that depends somewhat on the relative distances being depicted in the image. Panoramic landscape, no. Interior shot possibly.
- That now brings up the various lens reviews, indicating that a lens this wide is nice and sharp. Its all relative.
- Now I need to figure out the best way to apply this lens, for the best results.
I'll be adding more to this as the evening goes - but I want to go shoot the sunset and check the colors...
OK, here are the images, the one Monday, and then the one today. I know the lighting is different, that's the best I could do on short notice. Is there any real difference, when one tries to compensate for the light. Well, I went pixel peeping and at 800% the blobs looked better defined. The lens is not designed for pixel peeping.
What the lens is designed for is taking in the wider view - and I think that it does that pretty well.