rivi1969 Posted October 30, 2019 Author Share #21  Posted October 30, 2019 Advertisement (gone after registration) ”The standard way to fix shading is with a calibration photo. While taking a regular photo, you can also shoot a reference or calibration frame with the same optical set-up, at the same time.” Too much trouble really, I don’t see myself taking calibration photos every time I click the shutter. Unfortunately I bought the 21mm F4 already, so BW landscapes will be. Quote Link to post Share on other sites More sharing options...
Advertisement Posted October 30, 2019 Posted October 30, 2019 Hi rivi1969, Take a look here Voigtlander 21mm f4 magenta corners?. I'm sure you'll find what you were looking for!
jaapv Posted October 30, 2019 Share #22 Â Posted October 30, 2019 You only need to shoot the calibration photo once and store it in a separate folder 1 Quote Link to post Share on other sites More sharing options...
Exodies Posted October 30, 2019 Share #23 Â Posted October 30, 2019 Any tips on preparing an evenly illuminated reference? Quote Link to post Share on other sites More sharing options...
jaapv Posted October 30, 2019 Share #24 Â Posted October 30, 2019 53 minutes ago, jaapv said: You only need to shoot the calibration photo once. Â 42 minutes ago, Exodies said: Any tips on preparing an evenly illuminated reference? I just held a sheet of white paper in front of the lens and took a few at different apertures, with cloudy light and an even background. You could also use an Expodisk 2 Quote Link to post Share on other sites More sharing options...
jmahto Posted October 30, 2019 Share #25  Posted October 30, 2019 (edited) 53 minutes ago, Exodies said: Any tips on preparing an evenly illuminated reference? I use a light table. I bought it mainly for shooting negative/slides with BEOON though. It costs in between $30-$100 in USA. However, as I said before, somehow I have better success with CV15 VII than 21mm. After correction slight color shading remains that is annoying for big sky. City or interior is ok. Edited October 30, 2019 by jmahto 2 Quote Link to post Share on other sites More sharing options...
sblutter Posted October 30, 2019 Share #26  Posted October 30, 2019 13 hours ago, lct said: Show me a cheap Leica . The CV 21/3.5 is very good with no red edges and is much less expensive than the SEM. It has more CA though but modern raw converters deal easily with that. Couple of test pics below. CV 21/4 on M240:https://photos.smugmug.com/photos/i-tSjcTwd/0/8c0156e6/O/i-tSjcTwd.jpg CV 21/3.5 on M240:https://photos.smugmug.com/photos/i-DgKZWzm/0/47cee379/O/i-DgKZWzm.jpg Eesh! I've never seen such red edging! (No prob with my Zeiss 21mm) Quote Link to post Share on other sites More sharing options...
lct Posted October 30, 2019 Share #27  Posted October 30, 2019 Advertisement (gone after registration) 1 hour ago, sblutter said: Eesh! I've never seen such red edging! (No prob with my Zeiss 21mm) Yours is not the compact ZM 21/4.5 then i suspect. The ZM 21/2.8 is significantly bulkier. 1 Quote Link to post Share on other sites More sharing options...
KFo Posted October 30, 2019 Share #28  Posted October 30, 2019 Apparently results vary by Leica camera model.  On my M10P I can code as the 11134 lens and it works great to eliminate the color shift at the sides of the frame.  When I get home later, I can drop an image  in that shows the level of magenta color shift without using any in camera correction.  Frankly, if fixing it in post was my only choice I’d pass on the lens. I’ve been working with the 21f/4 color Skopar for a couple of weeks now and really enjoying it as a social documentarian’s lens. Still adjusting my visualization to the wide perspective... The reason I’m dedicating a good bit of effort to learning and using this lens is I’m considering it as one alternative lens for a six month hike that I’ll be departing for next summer.  The lens is light, well built and covers an interesting perspective if used well.   Hang in there, it’s easy to get talked into more expensive, faster, heavier glass, but for travel as an alternative I think the 21f/4 is looking pretty good for my use. Regards, Kevin 1 Quote Link to post Share on other sites More sharing options...
rivi1969 Posted October 30, 2019 Author Share #29  Posted October 30, 2019 18 minutes ago, KFo said: Apparently results vary by Leica camera model.  On my M10P I can code as the 11134 lens and it works great to eliminate the color shift at the sides of the frame.  When I get home later, I can drop an image  in that shows the level of magenta color shift without using any in camera correction.  Frankly, if fixing it in post was my only choice I’d pass on the lens. I’ve been working with the 21f/4 color Skopar for a couple of weeks now and really enjoying it as a social documentarian’s lens. Still adjusting my visualization to the wide perspective... The reason I’m dedicating a good bit of effort to learning and using this lens is I’m considering it as one alternative lens for a six month hike that I’ll be departing for next summer.  The lens is light, well built and covers an interesting perspective if used well.   Hang in there, it’s easy to get talked into more expensive, faster, heavier glass, but for travel as an alternative I think the 21f/4 is looking pretty good for my use. Regards, Kevin Thank you Kevin, Yes, I won't get anything more expensive -in fact I bought the 21mm f4 already on eBay for 300 bucks like new- I know there are plenty of better and amazing lenses but basically this baby will be used mainly to capture some landscapes in the Chinese mountains of Guilin and that would be it, so I will do the coding and try the calibration thing too. Regards, R Quote Link to post Share on other sites More sharing options...
david strachan Posted October 30, 2019 Share #30 Â Posted October 30, 2019 You'll get used to doing the corrections using Flat Field. Just a hint...don't forget to take some Portrait and Landscape orientated calibration frames. I use a frosted glass door, out of focus and autowhite balance to make my calibration images in dng format. ... 1 Quote Link to post Share on other sites More sharing options...
KFo Posted October 31, 2019 Share #31  Posted October 31, 2019 Here is a reject from some street shooting recently with the Voigtlander 21 f/4 Color Skopar.  I had mental malfunction which allowed my to shoot all afternoon with the lens uncoded.  You can see the magenta shift along the right edge of the frame.  I'm using this thumbnail sized version of the image because it shows the shift most distinctly.  Frankly, I have a number of images in which you would be hard-pressed to find the color shift; it depends upon the subject matter. However, if in camera coding is an option in my view it works pretty well.  Even living with the color shift might be an option... Regards, Kevin   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! 1 Quote 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/302909-voigtlander-21mm-f4-magenta-corners/?do=findComment&comment=3845005'>More sharing options...
lct Posted October 31, 2019 Share #32 Â Posted October 31, 2019 The M10 does better with this lens but the OP has an M9 here. Quote Link to post Share on other sites More sharing options...
jmahto Posted October 31, 2019 Share #33  Posted October 31, 2019 Apart from the color shift, my issue with 21mm is that it is easy to get the vertical distortion if you are not careful. A slight tilt of camera up or down has a big effect. This is why I stop at 28mm for run and gun type of shooting. Quote Link to post Share on other sites More sharing options...
Rollin Posted December 18, 2019 Share #34  Posted December 18, 2019 A detailed blog post on setting up LR Flat Field: https://www.reidreviews.com/examples/flatfieldnew.html 1 Quote Link to post Share on other sites More sharing options...
rivi1969 Posted December 19, 2019 Author Share #35  Posted December 19, 2019 Well, I don’t know what happens with my copy but after several dozens of pictures in different lighting conditions I still have to see the magenta corner issue. All my images have came fine so far. 1 Quote Link to post Share on other sites More sharing options...
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