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    Cookies, Cookie, Cook's, and Cooke.
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    Cinematography/Lighting Mod Ryan Patrick O'Hara's Avatar
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    In anticipation for an upcoming feature film, another cinematographer and myself had a little fun and did a lens test to see just how well matched the Cooke Panchro/i lenses were to the very popular Cooke S4/i's. The feature is looking to use a set of S4's and Panchro/i's on a two camera shoot.

    Cooke S4's have been used on films and television shows such as: Entourage, Lie to Me, V for Vendetta, Erin Brockovich, The DaVinci Code, The Assassination of Jesse James, most of the Harry Potter series, Munich, Mr. and Mrs. Smith, Live Free Die Hard, Jarhead, Kingdom of Heaven, Ray, The Interpreter, The Informant, The Illusionist, Hulk, Frost-Nixon, District 9, Chicago, Cinderella Man, Casino
    Royale, Capote, Brokeback Mountain, Brothers, A Beautiful Mind, O' Brother Where Art Thou, The Village, House of Sand and Fog, and many many more.

    So we were interested in seeing how much the Cooke S4/i's little brothers, the new Cooke Panchro/i's, looked in comparison... especially because Cooke has always said the Cooke Panchro/i, S4/i, and 5/i lenses are color matched to each other. Cooke S4 lenses are also commonly considered one of the best color matched lens sets in the top professional level.
    This test may come to some as a no-brainer as to the result. I was told by a friend in the ASC, that cinematographer Robert Richardson, ASC who just shot Martin Scorsese's Hugo Cabret in 3D on some Arri Alexas and the new Cooke 5/i lenses, also had sets of Cooke S4/i's and Panchro/i's on the production. I would never doubt Bob Richardson, but I had to do the test myself!

    So we set up a cinematographer's still life as a test shoot. We were simply testing the similarities of contrast, color, and similar qualities. If we were to use S4/i's and Panchro/i's on a two-camera feature, we needed to see how
    they varied juxtaposed to each other. Last thing any cinematographer wants is to have to go through a DI correcting things that ought to have been done right in camera. Large shifts in color reproduction and contrast between lens sets can do this. With that said, we were not doing these tests to compare resolving power. We already know from plenty of experience that all modern Cooke lenses are by-and-far sharp and it wasn't a concern if one was more than the other. If we ever feel like exploring this, we will get some proper charts and go about it in a more scientific way.

    As for the variables:

    Camera: RedOneMX
    Lighting: Arri Tungsten 1k Fresnels, bounced. Controlled environment.
    Color Temperature: 3200*k
    Iso: 800
    Shutter: 180*
    Format: 4k, 16:9, RedCode 36
    Distance from camera to subject stayed the same for every lens.

    Lenses at our disposal:

    Cooke S4/i: 50mm, 75mm, 100mm, and 135mm
    Cooke Panchro/i: 18mm, 25mm, 32mm, 50mm, 75mm, 100mm
    Cooke S4/i CXX zoom: 15mm - 40mm

    I'll discuss my findings after I post the images. These images have not been touched in anyway. They are screen captures taken from RedCine-X and received absolutely no color grading. The .tiff files were then imported to Photoshop where I layered the correlating images upon each other and made my 'checkered' comparison still. All steps to preserve and maintain the quality/integrity of these results was taken.


    Checkered comparison stills is something I created to give more comparison points of reference. Two images are overlayed, and instead of the image being divided in half, the image is divided into quarters. The Upper-lef
    t, and lower-right sections are one image, while the other two areas are the other. This allows two boundaries per image to be juxtaposed with the other. If anyone wishes to download the original RedCine-X .tiffs, please let me know. They will lack the checkered system of comparison, but will be the same quality.

    Three Cooke Panchro/i focal lengths are compared to the Cooke S4/i CXX zoom lens, and the other three Cooke Panchro/i focal lengths are c
    ompared to the Cooke S4/i primes.

    Cooke Panchro/i 18mm & Cooke S4/i CXX zoom 18mm:
    18checker.jpg
    18mm Checker (8bit .jpg (faster download))
    18mm Checker (16bit .tif (slower download))
    Original Panchro/i 18mm (8bit .jpg)
    Original S4/i CXX 18mm (8bit .jpg)


    18mmcolor.jpg
    18mm Color Crop (8bit .jpg (faster download))
    18mm Color Crop (16bit .tif (slower download))


    Cooke Panchro/i 25mm & Cooke S4/i CXX zoom 25mm:
    25checkers.jpg
    25mm Checker (8bit .jpg (faster download))
    25mm Checker (16bit .tif (slower download))
    Original Panchro/i 25mm (8bit .jpg)
    Original S4/i CXX 25mm (8bit .jpg)


    25color.jpg
    25mm Color Crop (8bit .jpg (faster download))
    25mm Color Crop (16bit .tif (slower download))


    Cooke Panchro/i 32mm & Cooke S4/i CXX zoom 32mm:
    32checkered.jpg
    32mm Checker (8bit .jpg (faster download))
    32mm Checker (16bit .tif (slower download))
    Original Panchro/i 32mm (8bit .jpg)
    Original S4/i CXX 32mm (8bit .jpg)

    32color.jpg
    32mm Color Crop (8bit .jpg (faster download))
    32mm Color Crop (16bit .tif (slower download))


    Cooke Panchro/i 50mm & Cooke S4/i 50mm:
    100mm Color Crop (8bit .jpg (faster download))
    100mm Color Crop (16bit .tif (slower download))


    Panchro/i FoV Chart
    Each focal length box is actually the focal length image of that lens resized and placed on top of the focal length below it. See the differences between the lenses in the set. All are almost identical with the 18mm being warmer, and the 100mm being almost unnoticeable warmer.
    Download Here (16bit .tif Image (slow download))



    Results:
    For the reputation Cooke has, I went into the test optimistically. When I took a look at the results, my expectations were surpassed. To put it simply, the Cooke Panchro/i's almost exactly matched the S4/i's. I didn't think two completely different sets of lenses would match as if they were the same. But that is what Cooke went out to do when designing the smaller Panchro/i's and that is basically what they did.

    Under heavy examination, (clicking back and forth between two 4k 16bit .tiff images in rapid succession) I found the S4's had an almost undetectable amount of extra contrast... I really only noticed it in the darkest darks. The largest discrepancy between any of the lenses was the Cooke CXX. The zoom lens was warmer than the matching Panchro/i and S4/i lenses. It wasn't horrible, but enough that if I wanted perfection and wanted to avoid a costly DI session to hunt all the CXX footage down, I would make a very small compensation in camera. My $.02.

    Out of the Panchro/i range, the 25, 32, 50, 75, 100 are exactly color matched to each other. However, the 100mm Panchro/i is a nano-bit more warm than the rest, noticeable perhaps only at the most scrutinized examination. Within the Panchro/i set, the 5-set mentioned above is matched, no doubt. However the 18mm was a bit different. Although the 18mm Panchro/i is very close to the others, it was noticeably warmer in comparison. I'm not sure if it would be enough that anyone would notice, but if being juxtaposed multiple times to the other focal lengths, and I was aiming for perfection in-camera, I might consider bumping the CT a couple of points. The 18mm Panchro/i is certainly not as warm as the CXX zoom, but was the greatest inconsistency between any of the Cooke Panchro/i and Cooke S4/i lenses had to each other. With that said, if that was the biggest issue, it's really a non-issue. Take a look at the Panchro/i 18mm compared to the other focal lengths in the Panchro/i set in the FoV chart. The FoV chart is actually made up from all the Panchro screen grabs. They are simply resized and stacked upon each other. You can see how warm the 18mm is, and how close all the other primes are to each other in the Panchro/i set. The 18mm is the only lens in the set that stands out as not being almost exact to the others. I think knowing this, a bump perhaps of 300*k might clear this up. I didn't test how much it would take, but it's not terribly much.

    18mm Panchro/i v. 18mm CXX
    :
    The CXX zoom lens does not have lines accompanying the focal lengths on the barrel, so I got the lens centered on the 18mm focal length engraved number, and that was that. Getting the CXX on 18mm the best I could, it should be mentioned that it was not as wide as the 18mm Panchro/i prime. The 18mm Panchro/i is warmer than it's fellow Panchro/i brothers, but still is not as warm as the CXX. The way the room was rendered as far as perspective is almost exactly the same between the two lenses. However despite FoV being similar between CXX 25mm and 32mm compared to the Panchro/i's, the distortion of how the room is rendered changes. The Panchro/i's will render a more realistic 'flat' field, while the CXX makes the room look a little deeper because the sides continue to have a small warp. It's not aweful, but there is a difference. However, the 18mm lenses match. The CXX is warm compared to the S4/i and Panchro/i's, but since the 18mm Panchro/i is a warm too (but not as much) the warmth is best seen in the 25mm or 35mm panchro/i comparison.

    25mm/32mm Panchro/i v. 25mm/32mm CXX:

    The 25mm/35mm Panchro/i falls inline with the rest of the Panchro/i series and S4/i primes in regards of color rendition. Thus it is easier to see the Cxx warmth in these checkered images. I also noticed a small discrepancy between how they portray depth and the field. The edges of the CXX seem to be 'closer' while the middle seems to recede. The Panchro/i creates a realistic flat field, while the CXX has a slightly more three dimensional feel from some image barreling. The very edges of the screen seem to 'stretch' around the lens. I would probably have never noticed it without direct comparison to primes. Download the 25/32cxx and 25/32panchro and toggle them back and forth in some sort of picture viewer. It's quite interesting.


    50mm/75mm Panchro/i v. 50mm/75mm S4/i:

    It was the 50mm and 75mm Panchro/i vs. S4/i comparisons that really blew my mind. If I hadn't taken so much care labeling the digital frame grabs, I would have easily lost track of which was which. These lenses are completely interchangeable and even under demanding scrutiny, the differences will probably escape the trained eye. The only way I could see a difference was by toggling between two 16bit 4k .tiff images over and over. I eventually began to see the S4/i's possessed a small bit of additional contrast, and the Cooke Panchro's had maybe a nano-bit of warmness? I still am not sure if that is true or if I'm just trying to see things. Regardless, these lenses are so close to each other, their tolerances are probably equal to the tolerances between two lenses of the same set and same focal length. Perfect match.

    100mm Panchro/i v. 100mm S4/i:

    The Panchro/i 100mm and S4/i 100mm are very closely matched. Not exactly matched, like the 50mm and 75mm demonstrate, but because the Panchro/i 100mm is a very small bit warmer, I must mention it. However, this is nowhere near as warm as the CXX and I don't believe it's far enough to correct for it, even on the smallest level. In fact, I think it's slight enough that it's actually nice. Considering I rarely use the 100mm lens for regular shooting and when I do, it is often for a very long-lens beauty shot, I welcome the little nuance... even if it doesn't comes across on screen.

    Conclusion:

    It's simply amazing how much the Panchro/i's did compare to the S4/i's. It was much more that I required. The CXX zoom is a fantastic lens, and it's a difficult lens to make being a 15mm-40mm zoom and all. However, it does need to be cooled down in order to match the S4/i and Panchro/i's. Just by a small amount. It also has some barrel effects mostly seen when it's longer focal lengths are compared to the primes. Regarding the Panchro/i and S4/i's, I would not think twice about using these lenses in a two camera shoot, but not just for different units, but even for mother-daughter or cross coverage shooting. The CXX I would probably tell my AC's to make sure they bumped the CT a couple hundred k's when it goes on. Although not to the same degree, the Panchro/i 18mm could use a small bump in CT too, maybe as little as 100 or 200 kelvin from my tests so far. Otherwise, it's all gravy.

    ***Disclaimer***
    By now you have probably noticed how carefully I've been trying to choose my words when describing these findings. The differences I describe are almost all nuances and differences almost unnoticeable by the naked eye. I highly recommend downloading the images which I have taken so much time to compile before interpretations of my words become fact. I tried to be very thorough and detailed, and I don't want people thinking the differences I've mentioned are larger than they are, or smaller than they are. Please take a look for yourselves!
    Last edited by Ryan Patrick O'Hara; 01-12-2011 at 02:26 PM.

    If cinematography wasn't infinite, I'm sure I would have found the end by now.


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