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Old 08/07/12, 14:34   #1 (permalink)
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Default strange artifact..

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this strange artifact has started to appear on my images..
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Old 08/07/12, 14:37   #2 (permalink)
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Default Re: strange artifact..

bottom right corner crop..
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Old 08/07/12, 14:45   #3 (permalink)
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Default AW: strange artifact..

I couldn’t say I’ve ever seen something like that before. A cluster of stuck pixels maybe (assuming it is present in all of your images and always at the same spot)? Your sensor hasn’t been hit by a laser by any chance?
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Old 08/07/12, 15:07   #4 (permalink)
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Default Re: strange artifact..

Oh, the large wooden yacht. Yes, it appears in many of my photos, too, which is most disconcerting when doing interior architecture.

Seriously, I've not seen that before, either. The fringe area puzzles me most. I look forward to finding out what it is.

By the way, if the artifact appears on every photo in the very same place, there is a Photoshop action that can patch it automatically.
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Old 08/07/12, 15:47   #5 (permalink)
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Default Re: strange artifact..

it appears on every image at exactly the same spot but not always white so i think it's probably not dead pixels. it lightens whatever's at that spot with the darker edge which appears not exactly spherical, more of an octahedron with straight edges. lenses used were both tri-elmars with a pop of flash but i don't think it's lens related. i'm going to give the sensor a wet clean & see what happens..thanks for your input..will keep you posted.
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Old 08/07/12, 16:06   #6 (permalink)
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Default Re: strange artifact..

Have a magnified look at your sensor first. If it is a glob of whatever you do not want to drag it all over the place and might want to have it cleaned professionally.
Wild fantasy: A sunburn hole in the (plastic) microlenses?
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Old 09/07/12, 08:25   #7 (permalink)
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Default Re: strange artifact..

I am interested to know what you have learned. I am sure it's frustrating.
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Old 09/07/12, 09:00   #8 (permalink)
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Default Re: strange artifact..

I doubt it is dust because if you stop light getting to the sensor, like a great big blob of dust might, you don't just record a shadow as with 99% of dust, you get black. This is white.

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Old 09/07/12, 09:55   #9 (permalink)
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Default Re: strange artifact..

Indeed, but a blob of something transparant might act as a little lens, concentrating the light. (conjecture!)
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Old 09/07/12, 15:14   #10 (permalink)
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Default Re: strange artifact..

It might be interesting to shoot a black frame to see if the spot shows. (Manual under-exposure with lens cap on.)
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Old 09/07/12, 19:13   #11 (permalink)
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Hi,
Probably best to send for repair.Not likely a matter of anything blocking light from the sensor, white equals exposure, not lack of. Perhaps a pinhole in the top shutter blade?
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Old 09/07/12, 19:54   #12 (permalink)
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Default Re: strange artifact..

I thought of that as well, but it would show up as a stripe.
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Old 10/07/12, 03:02   #13 (permalink)
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Default Re: strange artifact..

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I thought of that as well, but it would show up as a stripe.
Hi again,
Perhaps, but not necessarily. If there is a pinhole and it is really a pin hole, it my allow enough exposure to create the spot while at rest, the added exposure during the shutter travel would be insignificant and not show up. But then again, this is also conjecture and the OP should have the camera checked by a Leica repair technician.

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Old 12/07/12, 20:07   #14 (permalink)
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Default Re: strange artifact..

thank you for all your useful comments. after a a good dust out with a rocket blower, a wet clean with two strokes back & forth followed by a full afternoon's shooting, the artefact has completely gone. it seemed to appear after a previous sensor wet clean by myself which may have left some residue or yeast bacterial growth of some sort behind over the following shoot (a home interior feature which was the houseboat example posted). it's very hot & humid here at the moment & that could have had an effect. fortunately no repairs required this time. many thanks again to all.
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