urohlam Posted September 20, 2011 Share #1 Posted September 20, 2011 Advertisement (gone after registration) so, today I went in to a camera shop to pick up a used voigtlander 15mm super wide. The shop keeper agreed to let me return it in seven days if I don't like it. I took some shots today, and found out there is a strange shade on one side of the picture it produces. I have no idea if this is normal or not, so here I am, seeking for some input: notice on one short side of these two pictures, a strange color gradient occurs? that's what I'm talking about. I initially assumed it is due to the fall off, but it didn't make sense that only one side has it. so what is the deal? Link to post Share on other sites More sharing options...
Advertisement Posted September 20, 2011 Posted September 20, 2011 Hi urohlam, Take a look here strange shade on one side of the picture. I'm sure you'll find what you were looking for!
IkarusJohn Posted September 20, 2011 Share #2 Posted September 20, 2011 Hi Urohlam, I assume you're using an M9? This looks like the Italian Flag phenomenon - search the forum for more information. It arises from the refraction of very oblique light rays hitting the edges of the sensor. It is important for wide angle lenses to be coded correctly on the M9 to avoid this effect. The Leica lenses pretty much all have adjustment for this built into the latest M9 firmware. For Leica lenses with coding on the mount, the camera automatically sets the right adjustment. If the lens is not coded, then you need to make a manual selection. For non-Leica lenses, you need to select the best coding in the Manual setting (press the Menu button to the right of the LCD screen on the back of your M9, and select Lens Detection - you then have to scroll down to the best choice). I'm sure others will chime in and say which is the best setting for this lens (if there is one). Sean Reid might have something on this lens, or Steve Huff. Then again, there might not be a code which does the job, in which case I'd return it and be thankful you saved yourself some money and heaps of frustration. You can probably deal with it in post processing, but it will be a permanent hassle. Cheers John Link to post Share on other sites More sharing options...
pico Posted September 20, 2011 Share #3 Posted September 20, 2011 That does not happen with My M9 and the Voigtland 15mm. Sure, it vignettes, which can be largely corrected, but both sides are even. I manually set mine for 16mm, but it is very strange when I program no correction it is not much worse at all. But it WILL underexpose with the A setting. Open two stops for better results. Link to post Share on other sites More sharing options...
aesop Posted September 20, 2011 Share #4 Posted September 20, 2011 ...first try the lens on another digital M, then on a film M. Assess the results and then draw your conclusion(s). Link to post Share on other sites More sharing options...
urohlam Posted September 20, 2011 Author Share #5 Posted September 20, 2011 thanks guys for the input. I did change the setting to 16mm, and this what I got under that setting. aesop has a very good point of consider my machine as a problem source, but the reality doesn't allow me to test it out because I can't access to another leica m9. Link to post Share on other sites More sharing options...
Ronan Posted September 20, 2011 Share #6 Posted September 20, 2011 Looks like another M9 needs to be sent back... Have you contacted Leica/Dealer? Link to post Share on other sites More sharing options...
urohlam Posted September 20, 2011 Author Share #7 Posted September 20, 2011 Advertisement (gone after registration) Looks like another M9 needs to be sent back... Have you contacted Leica/Dealer? you had my heart racing there for a bit no I haven't, but this only happend with this particular lens, all my other pictures were perfectly fine. at least I thought. I will go do some test right now. Link to post Share on other sites More sharing options...
urohlam Posted September 20, 2011 Author Share #8 Posted September 20, 2011 Looks like another M9 needs to be sent back... Have you contacted Leica/Dealer? ok, my other lens, which is a Leitz 28mm f2.8, has pretty much the same problem, and it appears to be the most obvious with the aperture wide open at 2.8. So from your words, seems like this is not normal? Link to post Share on other sites More sharing options...
TomB_tx Posted September 20, 2011 Share #9 Posted September 20, 2011 What firmware version are you running? The latest (1.162) was done primarily to address this issue with wideangles. Also, most who use the CV 15 say the correction is best if you manually select the Leica 21 non-asph profile. Since you notice it with the 28 I'd suspect you have the earlier firmware, or an "individual variation" in your M9 Link to post Share on other sites More sharing options...
StephenPatterson Posted September 20, 2011 Share #10 Posted September 20, 2011 Looks like another M9 needs to be sent back... Have you contacted Leica/Dealer? Looks like a user who doesn't know how to set up a manual lens profile for the CV 15 and use cornerfix. This is typical Italian Flag syndrome and is well documented here. The correction is a combination of the latest firmware, combined with the proper lens coding, however the CV 15 will still require the use of secondary software (i.e. cornerfix) to correct for this non Leica lens. My M9 does the exact same thing with the CV 15. It must be corrected pp. The latest firmware will not entirely remove the vignetting and cyan corners Link to post Share on other sites More sharing options...
250swb Posted September 20, 2011 Share #11 Posted September 20, 2011 This looks to me like normal vignetting (accentuated in the dark photograph by massive under exposure) and also red edge. The 'red edge' effect you can look up in the LUF archives, you need Cornerfix to fix it. Most often this is seem when using slow wide angle lenses not designed by Leica. Cornerfix will also get rid of vignetting (the dark corners), but make sure you have manually entered a code for the lens in the menu. Assuming the 28mm you are talking about is an Elmarit M try the code for a 28mm f2.8 11804 or 11809. I really don't think this is a situation to send the camera back to Solms, but more a case of learning to use it properly. You have simply encountered a few of the biggest problems that arise with another manufacturers lens, uncoded lenses, and underexposure, and all in one image. Steve Link to post Share on other sites More sharing options...
jaapv Posted September 20, 2011 Share #12 Posted September 20, 2011 Completely normal for the lens. Shoot an LCC profile for Capture One or use Cornerfix and it is a non-issue. As for the 28, make sure you have the newest firmware and that the lens is coded or set in menu Link to post Share on other sites More sharing options...
TomB_tx Posted September 20, 2011 Share #13 Posted September 20, 2011 One other factor reported is that the correction for these "edge effects" in the Leica firmware varies with ISO setting, and is most effective at 160 ISO. Since these ultra-wides don't show camera movement as much as longer lenses, you can use lower shutter speeds needed with the lower ISO setting. After all, 160 used to be high-speed color film! Link to post Share on other sites More sharing options...
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