philipoz Posted November 7, 2024 Share #1 Posted November 7, 2024 Advertisement (gone after registration) Hi, I have recently bought a Leica m monochrome with the corrosion issue. Black spots were present on the photos, i fixed it by replacing the low pass filter, it works fine now. I have the opportunity to buy another m9 but this time with the purple fringe issue. Are both problems (black spots and purple fringes) due to the corrosion on the low pass filter? Link to post Share on other sites More sharing options...
Advertisement Posted November 7, 2024 Posted November 7, 2024 Hi philipoz, Take a look here Leica m9 purple fringe vs black spot (sensor corrosion). I'm sure you'll find what you were looking for!
3D-Kraft.com Posted November 8, 2024 Share #2 Posted November 8, 2024 (edited) The M9 / M9M has no low pass (AA) filter. Whatever you replaced, was not this one. The filter glass, that caused the corrosion issue was the IR-cut filter. What kind of "purple fringe issue" do you mean? I only know of purple / green fringing caused by CAs of many lenses (typically those, that open wide). With some lenses (e.g. Voigtländer 25/4), you also get "purple edges", because their design (rear lens element close to sensor) does not play well with digital sensors. Perhaps you can provide a link telling us about that issue or show sample photos? Edited November 8, 2024 by 3D-Kraft.com Link to post Share on other sites More sharing options...
philipoz Posted November 8, 2024 Author Share #3 Posted November 8, 2024 I used the coated version of this filter: https://www.aliexpress.com/item/1005003649878687.html?spm=a2g0o.order_list.order_list_main.11.4f611802jf1v0i Oh sorry I meant purple curtain not purple fringe. Something similar to this: https://www.google.com/search?q=purple+curtains+m9+leica&sca_esv=9f144a8a30519894&rlz=1C9BKJA_enAU1113AU1113&hl=en-GB&udm=2&biw=1373&bih=835&sxsrf=ADLYWIIy-UTHgP1OMCX20KST0bkpfp0atA%3A1731073324307&ei=LBUuZ_C0Etqb4-EPgp2bWA&oq=purple+curtains+m9+leica&gs_lp=EhJtb2JpbGUtZ3dzLXdpei1pbWciGHB1cnBsZSBjdXJ0YWlucyBtOSBsZWljYTIEECMYJzIIEAAYgAQYogQyCBAAGIAEGKIEMggQABiABBiiBDIIEAAYgAQYogRIkBdQnA1YgxBwAHgAkAEBmAHeAaABtwaqAQUwLjQuMbgBA8gBAPgBAZgCA6ACsQPCAggQABiiBBiJBZgDAIgGAZIHAzAuM6AHzxM&sclient=mobile-gws-wiz-img#vhid=hAYVYrJckHKySM&vssid=mosaic Link to post Share on other sites More sharing options...
3D-Kraft.com Posted November 8, 2024 Share #4 Posted November 8, 2024 The filter glass looks like an IR-cut filter but the discription over there at Ali is rubbish... The purple curtain is not a corrosion effect. Looks like one half of the sensor is defect (the M9 full frame sensor is put together by two smaller sensors). If you see that since the filter glass replacement, the sensor may have been affected by that operation. 1 Link to post Share on other sites More sharing options...
petard Posted January 15 Share #5 Posted January 15 (edited) tldr very diffcult repair with high chance of failure compared to the glass replacement The issue is related to the corrosion, it turns the glue used for the sensor glass into acid gel. This gel damages the gold wires that connect the sensor to the mainboard, leading to split screen / black / purple images. It can be repaired by rewiring the gold threads (requires special machinery) but the success rate is only around 50%. Also artefacts might remain. Edited January 15 by petard Link to post Share on other sites More sharing options...
jaapv Posted January 15 Share #6 Posted January 15 It basically means a sensor/main board replacement. And no are available. Don't buy. 1 Link to post Share on other sites More sharing options...
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