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Thread: Urgent: LCC from IQ180 ? Is this OK or a bad back?

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    Urgent: LCC from IQ180 ? Is this OK or a bad back?

    All other problems on the side, I have one main concern:

    Just wanted to know if: A: I'm going mad. B: This is still in the specs C: I had a brilliant P65 D: Something is really not fine with my IQ180

    LCC - DF camera, 80mm Phase One

    Left nothing done to the file. Left P65 right IQ180


    Now I did the following in C1for both files: Saturation to 50, in levels: black to 85 and white to 180, after that I used the WB tool and clicked in the middle.

    Left P65 right IQ180


    What do you see and what do you mean ?

    I can see the green/yellow band even in the first version, even through it is only very light. However, I'm asking myself if this should be there at all on device such expensive? I mean the P65 does not have it and looks to my eyes much better. (well except dust ;-) )

    I just want to know what people think. I'm currently uploading both RAW files. Will post them as soon as its finished.


    Oh and if you don't see a problem, just write it. It could be that it is something I'm seeing which isn't there for other people ;-)

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Here are the raw files: https://rapidshare.com/files/2485991...65_-_IQ180.rar
    (No account needed)

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    Subscriber & Workshop Member GrahamWelland's Avatar
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Christopher,

    I think Doug summed it up in his post on the other thread - at some point all backs have some susceptibility to lens color cast even with retrofocus lenses - doesn't look good though:
    http://forum.getdpi.com/forum/showpo...2&postcount=57
    Last edited by GrahamWelland; 23rd May 2011 at 09:54.
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    If this is normal and acceptable, I must have had a pretty perfect P65

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    Sr. Administrator Jack's Avatar
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Have to say that it does not look right (or good) to me.

    Going back through my recent images and see if I can find even a hint of color cast in any images >> Edit: Just did that.

    I had several images with large expanses of gray skies. One in particular was the full sky in gray while facing North and it was not blown. In C1 I reduced exposure for that frame by 1 full stop, nothing weird. I compressed shadow levels as you did all the way to 125, again, nothing weird color-wise. I compressed the highlights to fully blow the sky, again no weird color at all. I zeroed levels and droppered all over the gray sky. In no case did color temp change by more than 40 points (5602 through 5646), and tint by 0.5 points (-2.4 to -2.9) -- IOW a very even tone of gray sky corner to corner in at least the upper half of that frame.

    Obviously the above is not conclusive, but it is somewhat relevant data to start with. Regardless, the fact my gray skies are all very even with the 55LS and 80LS on the DF body, I would have to say your IQ180 is somehow defective. And this could be exacerbating the issues you're seeing between IQ180 and 43.

    Good news is I am getting an Arca RM3Di later this week along with a Schneider 43 and will test it thoroughly over the IQ180 this coming weekend, so stay tuned.
    Jack
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    I mean the thing I'm asking myself. Would I see it in a normal image ? Probably not. Would I see it in a image which is quite neutral but with some editing ? Probably yes. So, the only thing I want answered is, if this is "normal" or not. Thats also the question I asked Phase One support today. Will post back when I get a answer. I have to say that I don't think it is normal that a 40,000 camera shows something like that, even if it is slight. I mean I know my 2000EUR Canon does not show is and I kn ow that my P45 never showed it and my P65 as seen a both is also a lot more neutral.

  7. #7
    Garcia
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    I agree with Jack

    These are from my Aptus 12, PhaseOne [email protected]

    Left = iso50 | right = iso800


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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    I should add, I'm not talking or complaining about the "normal" lens cast when pushing such a file that way, but about the ugly yellow band which one must call sensor cast??? I don't have the right word. But I think most of you get what I'm talking about

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Quote Originally Posted by Christopher View Post
    I mean the thing I'm asking myself. Would I see it in a normal image ? Probably not. Would I see it in a image which is quite neutral but with some editing ? Probably yes. So, the only thing I want answered is, if this is "normal" or not. Thats also the question I asked Phase One support today. Will post back when I get a answer. I have to say that I don't think it is normal that a 40,000 camera shows something like that, even if it is slight. I mean I know my 2000EUR Canon does not show is and I kn ow that my P45 never showed it and my P65 as seen a both is also a lot more neutral.
    The color stripe on the right side (also visible in your tech camera LCC) indicate bad calibration, bad firmware, or bad hardware. The least likely of those three is the bad hardware; given your problems with CF cards the bad firmware seems most likely. Regardless you should consult with your dealer to have the problem resolved whether by calibration, firmware, or hardware repair/replacement.

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    It seems pretty clear you have a defective back Christopher...
    Jack
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  11. #11
    Shelby Lewis
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    check this out: http://www.luminous-landscape.com/te...rrection.shtml

    I've not read all the replies above to the extent that I may have missed someone else mentioning this... hopefully it's helpful.

    Cheers, Shelby.

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    I think this is perfekt to show the problem. Straight LCC with no shift and just 100 color boost. All the blue stuff is normal and fine, it is just how a back looks on a tech camera, the reason we have LCCs. However the yellowisch band looks out of place.

    Other updates, I'm talking to Phase one at the moment, they have the raw files and I will post again as soon as something new comes up.

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Looks like a light leak or something
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    I thought on that, but from where, I mean it's on all Phase lenses (645DF) and on all Arca. Would need to come from the back itself, which than again is the same problem as any other hardware.

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Check the mount on the back and make sure you are locked and loaded to your cam. Than look and see if any chance there is spacing or not sealed down. I look at these things as one step at a time and process of elimination. Your just not looking normal here hate to say it. But certainly get in touch with your dealer.
    Photography is all about experimentation and without it you will never learn art.

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    I am not familiar with LCC. Do I need to worry with modern lenses and 645DF?

    Thanks

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    If you have a normal back, which should not have a visible Lens/Sensor Cast. Certainly not!

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Christopher, I can see something similar in the P65 reference shot you posted in the IQ180/Rodenstock/Schneider thread (running vertically along the RHS edge).

    Or am I just imagining it?

    http://www.forums.getdpi.com/forum/s...6&postcount=26

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    No you are not. But it comes from the tech camera lens. As I mentioned a both on a tech camera there is this slight yellonisch, however it is gone with the p65 on any phase one lens and is still there on the iq back.

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    Senior Member etrump's Avatar
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Christopher,

    This post scared me enough to shoot a slew of LCCs as soon as the IQ180 arrived. Fortunately, mine all looked as I would expect.

    I won't venture an uneducated guess, hopefully P1 will get you straightened out.

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    I dont have the LCC, how can I test mine?

    Chris, does the defect show up visually in a normal image?

    Thanks

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Quote Originally Posted by etrump View Post
    Christopher,

    This post scared me enough to shoot a slew of LCCs as soon as the IQ180 arrived. Fortunately, mine all looked as I would expect.
    Ed,

    Could you list which lenses you own and tested?
    Jack
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Quote Originally Posted by Dan Santoso View Post
    I dont have the LCC, how can I test mine?

    Chris, does the defect show up visually in a normal image?

    Thanks
    Are you shooting with a tech camera?
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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    Scary. if that's on a DF with standard and Retrofocus lenses, then God help you on a technical camera with true wide angles.

    I would double check the light sealing of the IQ back. There are reports of defective pins not holding the back as tight as should be to camera. Funny how the most advanced beasts are tripped up by a simple mechanical detail sometimes.

    Otherwise - yes send it back !

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    Re: Urgent: LCC from IQ180 ? Is this OK or a bad back?

    No I am on DF. Does this happen only with technical camera?

    I shoot with 4x5 before (never with a back).

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