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04-10-2010, 01:02 AM   #1
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Question about the *ist DS

I noticed that while posting this image to a thread in the photo threads, that something that bothered me when I first edited it came back to mind. There seems to be something weird going on in the area of the bridge in this photo, and I've honestly never seen it with any other camera. I'm not sure what it is, this was taken at ISO 200 I'm fairly sure so I wouldn't think that is noise in it.



A similar problem also crops up in photos like this one.



There seems to be the same kind of issue taking a different form, this time on the bottom of the photo it looks like a lattice form, which I could assume is the pixels, but I don't understand why they would only appear in that part of the photo.

Has anyone else ever had this problem?

04-10-2010, 01:41 AM   #2
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I see a spot in the second photo on the right side. In the first photo in the bridge area I see only clouds in background. Where have you shot the second photo? I finde it very nice.
04-10-2010, 03:35 AM   #3
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I cannot detect anything except a dust spot on the 2nd shot.
04-10-2010, 12:27 PM   #4
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It might help to post a 100% crop of the area thay concerns you. Offhand, I don't see anything unusual in either of these shots, but I really don't know what I'm supposed to be looking for.

BTW, noise is indeed quite possible at ISO 200 when shooting long exposures, as the sensor heats up. That's why many cameras off "dark frame subtraction" (aka "slow shutter noise reduction" as opposed to "high iso noise reduction").

04-10-2010, 02:36 PM   #5
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QuoteOriginally posted by Marc Sabatella Quote
It might help to post a 100% crop of the area thay concerns you. Offhand, I don't see anything unusual in either of these shots, but I really don't know what I'm supposed to be looking for.

BTW, noise is indeed quite possible at ISO 200 when shooting long exposures, as the sensor heats up. That's why many cameras off "dark frame subtraction" (aka "slow shutter noise reduction" as opposed to "high iso noise reduction").
http://farm3.static.flickr.com/2626/3701881010_2c7177dfb3_o.jpg

http://farm3.static.flickr.com/2670/3686309012_c2a459b4ff_o.jpg

The first one it's mostly between the cables of the bridge, I understand that there can still be noise, but why is it only in one spot?

The second one has the problem more towards the bottom, almost like the sensor just gave up on trying to figure out what was there.
04-10-2010, 03:44 PM   #6
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I can't see anything wrong either or the posting in a smaller file might have degraded it or made it a bit unoticeable?
04-10-2010, 03:55 PM   #7
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You can't see the horrible pixelation and noise in the first one? Look between the two towers in that lit area, you don't see that? It's not noise, at least I don't think. There isn't anything like it in the rest of the photo, same thing with the bottom of the second photo.
04-10-2010, 11:38 PM   #8
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Could it be that your monitor is 6 bit TN panel? I have viewed these pics on 3 monitors and both of my laptops have heavy pixelation on different parts of the sky. My H-IPS monitor however shows nothing abnormal. The 2nd pic looks normal on all 3 monitor.

04-11-2010, 01:16 AM   #9
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Well I suppose that's what it could be, but I've looked very closely at both (I noticed that the kind of mottle is actually a little more uniform on the second photo than when I first looked) but maybe it's just the dark areas of the first one that makes that one area the most obvious. Still seems weird that the towers don't exhibit this though.
04-11-2010, 05:40 AM   #10
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I have no idea what you are on about. Are you sure all this posting for the contest isn't affecting your eyes?
04-11-2010, 06:03 AM   #11
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I'm really not sure what your talking about. I looked at both photos for awhile and I just can't see anything.
04-11-2010, 06:06 AM   #12
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if you don't feel its noise then run the pixel mapper and see if that gets rid of them on your next shot, or just settle for lower resolution.
04-11-2010, 02:33 PM   #13
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No! This has bothered me since I got the camera. These two examples may not be the worst though, but I deleted the one where you could literally see a lattice on a hillside formed by the sensor or something because of that a few months ago. You all really can't see the noise though?
04-11-2010, 04:06 PM   #14
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QuoteOriginally posted by jct us101 Quote
No! This has bothered me since I got the camera. These two examples may not be the worst though, but I deleted the one where you could literally see a lattice on a hillside formed by the sensor or something because of that a few months ago. You all really can't see the noise though?
Not seeing anything here either.. Both on (calibrated) CRT and LCD screens. Certainly nothing that looks Lattice like. I think you're going to need to help all of us blind folk see exactly what it is you're talking about.


Last edited by JeffJS; 04-11-2010 at 04:30 PM.
04-11-2010, 04:26 PM   #15
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Have you tried it on multiple monitors? Since we all have (by definition) that would be the first possibility to eliminate.
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