LocalHero1953 Posted February 24, 2017 Share #1  Posted February 24, 2017 Advertisement (gone after registration) I've just returned from a trip to Oman, where I used the SEM 21 on my M240, a lot, for buildings/architecture and landscape. Before I went, I was advised here (by Jaap, I think) both to adopt IR-cut filters, and to use the Adobe flat field correction plug in. I fitted B&W IR-cut filters to all my lenses. In my ignorance, I thought the flat field correction needed no forethought; I took no Expodisc or anything similar, and failed entirely to take any decent reference images while I was out there.  All the images with the SEM 21 had ugly green edges, and significant soft vignetting. I hadn't noticed this issue with the SEM 21 before, so I guess it could be partly caused by the filter (I will check this out). Has anyone else found this problem, with or without a filter?  I spent this afternoon getting a good set of reference images in the garden, shooting a white sheet through a translucent disk cut from a plastic milk container, tightly fitted into the outer thread of the filter. The results have been startlingly good. Here is the image of the Grand Mosque in Muscat before flat field correction:  Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/269744-super-elmar-21-f35-green-edges-and-vignetting/?do=findComment&comment=3220833'>More sharing options...
Advertisement Posted February 24, 2017 Posted February 24, 2017 Hi LocalHero1953, Take a look here Super Elmar 21 f3.5 green edges and vignetting. I'm sure you'll find what you were looking for!
LocalHero1953 Posted February 24, 2017 Author Share #2  Posted February 24, 2017 And here is the same shot, including the same post processing, after flat field correction: Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/269744-super-elmar-21-f35-green-edges-and-vignetting/?do=findComment&comment=3220834'>More sharing options...
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