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06/11/2003 08:57:44 PM · #1 |
I'm concerned about the vignetting I've experienced with my F707, and would like to know what other owners of this camera have experienced. I'm wondering if I may have an alignment problem and need repair work.
Below is a photo of a flat, gray, evenly-lit surface at F8.0 and zoom set about half-way. You can see the vignetting, but the hot spot is offset to the right, and there is a red cast to the left.
Here's another photo that's badly affected:
And just to add some more fuel to the fire in the dodge/burn debate, here's what I get when I use the first image as a template to correct the second:
So, what have you other F707 owners seen? |
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06/11/2003 09:15:53 PM · #2 |
I will conduct the grey card test with my 717 as soon as I can find a grey card.
I'm very curious about the "And just to add some more fuel to the fire in the dodge/burn debate, here's what I get when I use the first image as a template to correct the second: that you mention. If it is an easy procedure, could you detail the steps you took to do this? I'm an editting idiot... I can crop, resize and that's about it.
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06/11/2003 09:22:36 PM · #3 |
do you get the same results with the grey surface at different f#'s.... and different shutter speeds???
remember f8 does not open up that much allowing in less light
as far as your pic of the goose looks like the white ballance may be not set right
I did a little editing and this is what I came up with.... I am no way near as good as others, but I think this looks good.
James
Message edited by author 2003-06-11 21:29:24.
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06/11/2003 09:30:37 PM · #4 |
I hate to admit this, but I don't see anything in the two geese pics. The second one looks a touch darker in the water colors. I actually don't know whether my camera is having a problem.....
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06/11/2003 09:52:59 PM · #5 |
Actually, i don't see anything wrong with your two geese picture either. In fact, i liked the first one better than the second. It's not because i don't like dodge & burn (i do whenever appropriate) but imo in the first one the color tonality of the water in the foreground is just a tad more interesting.
On the banding/vignetting picture, what are we looking at here? Is this a magnified example of a part of a picture?
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06/11/2003 10:23:06 PM · #6 |
On the vignetting image, the corners are darkened despite me photographing an evenly lit surface. It happens in most lenses, and especially with big apertures, but on my camera it seems chronic, and the left side is darker than the right, which is why I suspect a problem.
As far as the geese, you can see the dark tint in the water to the left, and darker corners. I took my sample image, set levels to get 50% grey in the brightest area, inverted it, then used that as an "Overlay" layer to dodge out the vignetting. The pattern is pretty repeatable from photo to photo, so it worked pretty well. In the "fixed" version, you see the water is now an even tone and the darkened corners are brightened.
The technique is not legal for challenges since I'm really compositing two photos, though one of them is just an error sample.
James, your image looks too blue to me, so I think our displays are different. I ordered a print of another image, so I'm going to verify then how well my monitor matches a professional print. It's an Apple Powerbook. |
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06/11/2003 11:14:55 PM · #7 |
I forgot to mention the dark left side problem.... It is a know problem and sony can fix it...unfortunatlly you have to send it to Sony. And maybe they can fix the other problem as well.
you can go over to www.dpreview.com
and do a search for Dark Left side or DLS
here is a link to the specific search i did on the Dark left side
Dark Left Side
if you are out of warranty and have Photoshop, there is a photosho action written specifically to correct images affected by the DLS problem. But you have to buy the Sony E book from Perer Inova (he can be found on the Sony Talk forum at Sony Talk Forum
James
Message edited by author 2003-06-11 23:17:52.
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06/12/2003 12:07:03 AM · #8 |
Holy crap, James. I've had this thing more than a year and snapped a few thousand shots, and I'm just finding out about this problem now. I can probably just refine the photoshop correction I tried above. It was pretty rudimentary, but worked well for demonstration. I have a 4 year warranty, but I don't think I want to be without the camera for an extended time just yet.
So, here's the next question. If I come up with a photoshop setup that does the Dark Left Side correction, which is applied to the whole image, can I count that as a "standalone image cleanup utility," which is challenge-legal? It would be just to correct an equipment flaw, like noise reduction or dust & scratches filters, which are legal. It wouldn't be specific to any photographic content.
Any other F707 owners care to comment? |
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06/12/2003 12:24:39 AM · #9 |
I've never noticed any such problem on mine but then I never looked for it. I'll probably do some tests to see if anything shows up but I'm pretty sure I would seen it by now. As far as your request to be able to correct it. I'm not against it but the administrators would have to decide on that one.
T
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06/13/2003 11:21:35 AM · #10 |
| I ran it by the administrators, and they agreed that a photoshop action to correct the "dark left side" would be challenge-legal. As James mentioned here, such actions already exist. But not everyone has photoshop, and also I'd say that the flaw is slightly different in each camera. I'm going to develop my own method, using the same approach I described earlier in this thread, only more refined. I will post a sort of tutorial, so if anyone else has dealt with this issue and has suggestions or tips post them here and I'll roll them all into one. |
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06/13/2003 01:48:16 PM · #11 |
I just quickly scanned through some of the photos that I have taken in the last few days, and, especially on the landscapes, I notice that it is dark down BOTH sides, not just the left side! Looking at jkiolbasa's "grey card", the dark areas on my photos look like the RIGHT side on that grey card shot. Is dark area there normal?
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