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Author Topic: Yosemite Set (645D)  (Read 5194 times)
natas
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« Reply #20 on: March 09, 2011, 02:08:15 PM »
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Now that I think about it, I believe I may of dodged areas quickly in Lightroom before uploading. This may explain what you are seeing. I am going to check the original file when I get home to be safe Smiley
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yaya
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« Reply #21 on: March 09, 2011, 04:16:16 PM »
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Shane,

No test required. Your image illustrates the split.
Black and White conversions sometimes,simply, highlight the fact.

I don't have enough experience to say whether the issue is random and will appear every now and again
or if it will always be present.

Earlier Leaf backs were very prone to this problem but were not alone.
I've seen it with various Phase and Hasselblad backs and more recently with
the Leica M8,M9 ,and the S2.

As far as I know,the remedy is a manufacturer re-calibration of the sensor

Track down Yair Shahar ( Yaya )  on this forum,now with PhaseOne, who could
very capably infirm you on this topic.

Mark

Hi Mark, I think you're mixing two different issues but it doesn't matter as the results are more or less the same

The line going down the centre of the frame in this case (SLR body, retrofocal lens) is likely a result of readout mismatch between the two sides of the Kodak sensor. Earlier Kodak sensors were using one readout only (and were slower) so usually did not show this. The newer 6 Kodaks use multiple readouts and if the camera/ back is not calibrated properly (or if the software cannot correct it) then this effect can be seen sometimes

I believe this can be resolved by re-calibration the camera as you have suggested (not sure how Pentax handle this, though)

You've mentioned Leaf backs but in our case this was more related to using wide angle, symmetrical lenses. At the time we offered a custom calibration that was done by the user and then later (about 18 months ago) it was resolved via some clever software algorithms

BR

yair
Leaf Imaging
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Yair Shahar | Product Manager | Mamiya Leaf |
e: ysh@leaf-photography.com | m: +44(0)77 8992 8199 | www.mamiyaleaf.com | yaya's blog
natas
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« Reply #22 on: March 09, 2011, 05:24:07 PM »
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Ahh ok now I see what you are talking about. I called Pentax and they said they can recalibrate it. I managed to find a few other photos with this but it is very very hard to see. In fact I really only notice it if I do black and white conversions and add a ton of contrast to the image.  Hopefully they will be able to see the problem with my examples and correct it.
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kuau
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« Reply #23 on: March 13, 2011, 08:23:13 PM »
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Here is my attempt at Yosemite over Presidents weekend with my Pentax 645D
http://kuau.viewbook.com/yosemite_february_2011

Steven
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Sinar arTec, Leaf Aptus II 7 AFI, 35, 70, 135mm Sinaron lenses,  HP Z3200 PS Printer
kimballistic
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« Reply #24 on: March 14, 2011, 02:32:10 AM »
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Here is my attempt at Yosemite over Presidents weekend with my Pentax 645D
http://kuau.viewbook.com/yosemite_february_2011

Steven

Attempt?  Jesus man, these are beautiful.  4th image to the last (water_falls_bw.jpg) floored me enough to look for a "buy" button.  Please tell me you print.

And look, you've dragged me from the hordes of LuLa lurkers.  Nice photos!
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