tag:blogger.com,1999:blog-813055710667942720.post2233566320236087046..comments2024-03-28T07:35:03.350+00:00Comments on Micro 4/3rds Photography: Geometric distortion correctionFredrik Gløcknerhttp://www.blogger.com/profile/07523430148487818493noreply@blogger.comBlogger17125tag:blogger.com,1999:blog-813055710667942720.post-57412628309472865592012-02-16T23:04:51.421+00:002012-02-16T23:04:51.421+00:00The downfall of Lumix geometric distortion correct...The downfall of Lumix geometric distortion correction is the sharpening filter used to compensate for the softening effect of the correction filter. This artificially enhances the aliasing artifacts produced by the image sensor, making image edge details excessively sharp. You can actually see the aliasing artifacts shimmer in the LCD as the lens locks into focus. While it's a manageable Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-64238364219921582222011-12-05T18:44:21.085+00:002011-12-05T18:44:21.085+00:00I'm not familiar with this. I don't think...I'm not familiar with this. I don't think it is needed, since the lenses are already corrected for when using out of camera JPEG images. And if you use the supplied RAW image processing program, you also get this correction automatically.Fredrik Gløcknerhttps://www.blogger.com/profile/07523430148487818493noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-67460875328272235642011-12-05T17:06:06.175+00:002011-12-05T17:06:06.175+00:00Do you know if it is possible on the GH2(like for ...Do you know if it is possible on the GH2(like for the Canon 5D II or the nikon's... to "record" new lenses with the ratio of correction that we want and or to use a system like "lensalign pro" (http://www.imaging-resource.com/ACCS/LA/LA.HTM)<br />???<br />thanks<br />jssteinberger@yahoo.comHeliosrunnerhttps://www.blogger.com/profile/07408746060498470775noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-18146840887132535232011-08-24T21:29:43.930+01:002011-08-24T21:29:43.930+01:00Ball Lightning: Lightroom automatically corrects e...Ball Lightning: Lightroom automatically corrects every Micro Four Thirds lens. The lenses have the correction parameters built-in, these are saved to the RAW file, and Lightroom gets the parameters from the RAW file.<br /><br />So in fact, today's Lightroom is perfectly capable of correcting Micro Four Thirds lenses that haven't been released yes. For example, I recently bought the Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-5295823350353596742011-03-23T13:16:21.297+00:002011-03-23T13:16:21.297+00:00I haven't used the program Lightroom, but I be...I haven't used the program Lightroom, but I believe all serious, commercial programs do this geometric distortion correction.Fredrik Gløcknerhttps://www.blogger.com/profile/07523430148487818493noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-59040498700057845362011-03-23T12:58:16.645+00:002011-03-23T12:58:16.645+00:00Does lightroom(3.3) automatically correct the 20mm...Does lightroom(3.3) automatically correct the 20mm 1.7? I've not been able to figure it out yet. thanks and LOVE the blog.Anonymoushttps://www.blogger.com/profile/15695639257365453939noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-43402741702369002102011-03-09T05:53:30.483+00:002011-03-09T05:53:30.483+00:00I have watched the complaints about using software...I have watched the complaints about using software to correct for lens distortions as if an inferior product is being sold.<br /><br />This is not true.<br /><br />In fact, the product is in many ways superior. Given the same amount of engineering for a “distorted” lens and a “flat” lens, the “distorted” lens will have Better CA, better resolution, and brighter edges, and focus more sharply overAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-44228754448237077032011-03-08T22:14:18.304+00:002011-03-08T22:14:18.304+00:00Advances in microlenses and now also backside illu...Advances in microlenses and now also backside illumination have helped to prevent shadowing of pixel's actual light gathering surface. And if anything M4/3 is mirrorless system least affected by oblique angle photons because of smaller sensor than APS-C. Sony NEX also has even smaller flange back distance.<br />And surely good part of that 14-140mm's "10% smaller and lighter than Esa Tuunanennoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-23557343516751963342011-03-08T18:21:29.125+00:002011-03-08T18:21:29.125+00:00Yes, I agree with you, as I also wrote in the arti...Yes, I agree with you, as I also wrote in the article text. Allowing for post geometric distortion correction allows the lens designers to optimize other aspects of the lens.<br /><br />And, coming from Pentax, my images are significantly sharper after switching to m4/3.Fredrik Gløcknerhttps://www.blogger.com/profile/07523430148487818493noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-83862612336410191452011-03-08T16:39:35.203+00:002011-03-08T16:39:35.203+00:00From Snowflake
The proof in the pudding is in the...From Snowflake<br /><br />The proof in the pudding is in the tasting. If the final image looks bad then it fails the test. <br /><br />I for one have not observed the loss of detail near the edge of any of the lenses when printed on 11x17 sized prints. Perhaps if I had a better printer I’d see the effects, but I believe it is the software in the camera that is making the difference. Those Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-48456647096860197822011-03-08T16:03:46.033+00:002011-03-08T16:03:46.033+00:00The Lumix G 8mm f/3.5 fisheye and Leica-Lumix 45mm...The <a href="http://m43photo.blogspot.com/2010/11/lumix-g-8mm-f35-fisheye.html" rel="nofollow">Lumix G 8mm f/3.5 fisheye</a> and <a href="http://m43photo.blogspot.com/2010/07/panasonic-leica-lumix-dg-macro-elmarit.html" rel="nofollow">Leica-Lumix 45mm f/2.8 macro</a> have no software geometric distortion correction.<br /><br />Based on your comment, it sound like you might not be very interested Fredrik Gløcknerhttps://www.blogger.com/profile/07523430148487818493noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-35070638785960457902011-03-08T15:22:35.368+00:002011-03-08T15:22:35.368+00:00That's the reason why I'm not interested a...That's the reason why I'm not interested at all about many of these current M43 lenses like this overhyped Lumix G HD 14-140mm:<br />Distortion is really extreme (as it isn't any fisheye lens) at wide angle and heavy software correction eats away resolution outside center area of frame. In tele end softer edges wouldn't matter that much as target is often small and in center but Esa Tuunanennoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-90237944372670465632011-03-08T13:59:17.696+00:002011-03-08T13:59:17.696+00:00If you shoot RAW images, then the correction is no...If you shoot RAW images, then the correction is not done in the RAW file. However, the RAW file contains information about the required geometric distortion correction needed. Many RAW converter programs will use this automatically, and let you work on the corrected image.<br /><br />So for most purposes, this automatic distortion correction is no problem at all. You may only see it if you Fredrik Gløcknerhttps://www.blogger.com/profile/07523430148487818493noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-47125364005558668682011-03-08T13:38:00.090+00:002011-03-08T13:38:00.090+00:00What happens when these lenses are mounted on an O...What happens when these lenses are mounted on an Olympus m4/3 body?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-88883208706927130402011-03-08T11:48:20.486+00:002011-03-08T11:48:20.486+00:00If I understood when we shoot RAW (GH1 for example...If I understood when we shoot RAW (GH1 for example) no correction is applied... Is it possible to apply the correction in-camera? If not, we have to take extra care when shooting RAW, and the geometric correction must be applied in post...knollnoreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-45354859869733001642011-03-08T06:28:47.912+00:002011-03-08T06:28:47.912+00:00The geometric correction is also done in video mod...The geometric correction is also done in video mode. It is not possible to turn off on the camera, neither in still image or video mode.<br /><br />The only way to see the actual effect, is to develop the image from the RAW file, with a program that allows for not doing the geometric distortion. (I used UFRAW.)Fredrik Gløcknerhttps://www.blogger.com/profile/07523430148487818493noreply@blogger.comtag:blogger.com,1999:blog-813055710667942720.post-78568943730580139952011-03-08T02:18:12.017+00:002011-03-08T02:18:12.017+00:00What happens in video mode(GH2)? Would be interes...What happens in video mode(GH2)? Would be interesting to be able to turn it on and off depending if you want a little fisheye or don't.Joelnoreply@blogger.com