Hi Alan, I can confirm that I make the same observations that you're reporting.
I have no explanation. However, if someone had cut out the blurry part and asked me "what's up?" I would have said that from my experience it looks like blur from camera movement or shake. This led me to ask myself, is it possible that (particularly) a wide angle lens, if being turned "around it's axis" in one direction during exposure, one utter side of the picture may get blurred in a similar way to your pictures, while the opposite side, for some physical/optical reason that I cannot explain, won't exhibit the same or equal (type of blur) blur? I may be completely off here, I'm just theorizing from my initial observation of the blur (on which I may very well be mistaken on). You know - I don't - the facts about the shooting, shutter speed and possible camera movement, which may completely eliminate.the grounds for my questions. Just some food for thought. Good luck, Lasse From: "Alan Chan" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, March 19, 2005 12:46 PM Subject: Could anybody explain this? > Guys I have discovered a weird problem which I cannot come up with any > explanation > so I need some guidance. Some recent shots have revealed that about 1/5 on the > right-hand side of the picture is blurrier than on the left-hand side under > normal > shooting condition (aperture f11 for all samples). > > http://www3.telus.net/wlachan/cb.jpg (1.7MB) > > To double check, 2 identical shots were done, 1 with the camera grip (blurry > side) > pointing up (ru.jpg), and the other pointing down (rd.jpg). This test > confirms the > previous finding. The bottom edge of rd.jpg is blurrier than the bottom edge > of > ru.jpg. > > http://www3.telus.net/wlachan/ru.jpg (2MB) > http://www3.telus.net/wlachan/rd.jpg (2MB) > > Now is the weird part. I did some careful test on a 2D subject (aligned with > bubble > level and shooting straight down at very close distance, about 0.6m) but > there is no > trace of blurry edge/corner at all. Both sides of the picture look equally > sharp, or > at least I cannot tell the difference. > > http://www3.telus.net/wlachan/f11.jpg (2.8MB) > > So what is going on? I have never noticed such interesting issue with my next > widest > lens FA*24/2 which is pretty sharp down to the corners for scenery. I thought > a lens > like this would perform worse at close distance, but it's not acutally?? > > Alan Chan > http://www.pbase.com/wlachan > > > > __________________________________ > Do you Yahoo!? > Yahoo! Small Business - Try our new resources site! > http://smallbusiness.yahoo.com/resources/ >
