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Robert Houllahan

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Posts posted by Robert Houllahan

  1. Digital sensors are linear devices (even when encoded into log) so a ISO change on a digital sensor is an overall dB gain increase.

    Film negative has a characteristic curve and a photo-chemical push will accentuate that logarithmic curve with more sensitivity in the middle than the top or bottom of the curve.

    In my experience 5219 pushed +1 is in the same sort of working range as an Alexa in the 1200 maybe to1600 ISO range, with the Alexa having some more shadow detail and 5219 more hilite overexposure tolerance and the mid being similar.

    YMMV

  2. 15 hours ago, Dan Finlayson said:

    You're describing a customer that likely doesn't exist

    That client was the US Military Industrial Complex and that was fractions of pennies on the hundred dollar bills they happily burned through. Certainly not any more but it was only within this decade that Hycam cameras were mostly replaced for this kind of work by digital substitutes.

    The US Air Force had a few very substantial labs of their own.

    I bet Kodak would do a special run for the overall cost of a master roll now and I was exaggerating a bit about the 25M feet intro cost.

    • Like 1
  3. 1 hour ago, Jonathan Martin said:

    Yes Robert, this is a Spirit scan. Here is a clip to get a better view:

    https://vimeo.com/786946045/bbf9d547b5

    A hair or other small object in the line scan gate on the Spirit does make a streak through the whole frame so it can very well be that is what this is, I have seen similar looking streaks on my Spirit(s) especially because how it dances so far across the frame and out of frame left.

    I would just send the film back for a rescan.

    • Like 1
  4. 2 hours ago, Dan Finlayson said:

    I think it's just a matter of market demand.  Even before digital, all the stock development was geared toward color stocks.  And these days, most people who want black and white want the double x sort of look.  

    I would think that if you offered to buy 25 million feet of film from Kodak they would figure out how to use multiple layers of Vision 3 emulsion without the color dyes and couplers for a theoretical new monochrome stock.

    Probably at a $1.00/ft or more price.

  5. 2 hours ago, Steve Switaj said:

    Greg Beaumont did (I think) about 6 BoCams, while Doug Fries did two or three conversions.

    ( I got to rebuild the electronics on one of the Fries VistaVision cameras last year, I wrote up the story on Hackaday…

         https://hackaday.io/project/186456-vistavision-camera-electronics-rebuild   )  

     

    And then there was the W7. And I mean THE W7, since there was only one. It was built from scratch by Jeff Willliamson of Wilcam, for high-speed work and could crank at 100 FPS, so it worked on every single disaster FX film for two solid decades.

    Very cool electronics rebuild project!

  6. I have two Visual Inst. Hycam-II cameras (built in 2002) and we used to do allot of work for Pratt&Whitney on FAA mandated tests for jet engines and other high speed camera work for military engines, including for the F-35.

    The largest test I worked on for them was a engine for the A380 and there was 27 Hycam-II 16mm cameras shooting SO-19 (7219 on Estar) at FR between 6000PPS and 11,000 PPS along about a dozen digital high speed cameras. The test was lit with 500 1K Lowel Omni quartz lights. The newer Hycam-II cameras have new motor control electronics which allow for the camera to get to full speed within 50-75ft of a 400ft roll.

    P&W would "rent" the lab for a day and we would process the negative and then do a transfer to video, but then cut the negative down to the sections they wanted to really see and make a timed 16mm print. I remember holding about 850ft of negative and thinking it cost about $35 Million to produce it. Picture clarity and detail was really excellent and far exceeded the digital cameras even very recently. The digital cameras would also have issues failing due to the very high vibration environment of a full running 80,000lb thrust engine blowing up.

    It was only in the last five years that they switched entirely to digital for this work.

    • Like 4
    • Upvote 1
  7. 1 hour ago, Perry Paolantonio said:

    First, I need to point out that our rates are pretty middle of the road even though you keep insisting they're high. I don't believe you for a second that the "going rate" for 4k scans in CA is $.25/ft (I'm assuming 16mm here).

    I cannot see that being the case either I am sure FotoKem is not charging $0.25/ft for 4K 16mm scans on the Scannity.

    Neither is Pro8mm on their Scan Station.

  8. 8 hours ago, Tyler Purcell said:

    The business in CA is .25/ft for fresh OCN. You can't charge the rates you do, it's just not possible, too much competition in that space. Heck, just look at The Negative Space in Denver, she charges .20/ft on a full scan station. How do you compete with that? She does excellent work as well. Again, the fact you have clients that will pay your rates is insanity. It shows that people just don't know. They just assume you're the only guy who can deliver that quality and it's blatantly wrong. 

    In all deference to Nikki I am sure she is nice and thorough (we just ran some B&W for her) buying a machine and immediately undercutting everyone else with the same machine's prices is IMO not the best way to start a business. I am sure this can work for a while if you have a scanner in your house and it is just you and a partner running it as a personal enthusiast venture. Start adding cleaners and film processing in a residential neighborhood etc. etc. etc.

    The Scan Station's ubiquity has largely made film scanning a commodity as DaVinci Resolve has for color grading and there are shops who use Resolve and charge bargain prices and shops that charge top dollar. And there are shops with Nucoda or Baselight etc.

    Racing to the bottom of the price scale is not a great thing and there are many many pro and other clients who won't work with the "cheapest" shop because they feel like something is wrong when the price is too low.

    • Like 2
  9. 42 minutes ago, Karim D. Ghantous said:

    You have a point here. My question is more hypothetical. Remember, too, that long exposures don't eliminate shot noise (as far as I understand the concept).

    longer exposures will actually show more of the inherent fixed pattern noise present in the shadow area of the sensor.

    Allot of the reason for "HDR" multi flash is to work to overcome the sensor noise flaws by pushing a "hot" second exposure to get the densest part of the negative into a better response portion of the sensors dynamic range and by doing so keeping the FPN out of the visible scan.

    This can get more DR from the shot film especially if it is overexposed but mostly the HDR process cleans up noise from the sensor.

  10. "

    9 hours ago, Perry Paolantonio said:

    the Archivist does not use the CMOSIS 5k imager that the SSP and the ScanStation used for a while. I believe it's the same family of Sony sensors as the full ScanStation uses, just at a lower res. Don't confuse the two. I don't think Lasergraphics has used the CMOSIS sensor for a while now. 

    It's not clear this is the case. 

    It is.

    I got one.

    It is a even newer gen Sony camera than the 6.5k one and it is excellent, extremely low noise and higher resolution than the 5k cmosis.

    The JAI Spark with the CMV20000 is 5120 x 3840.

    The New Sony in the Archivist is 5.4K x 3.8k

     

    And if you can find anyone who has been more of a pain in Stefan and LG's butt about sensor noise on the Scan Station with the 5K camera than me you should buy them a donut and a coffee.

    • Like 1
  11. 3 hours ago, Karim D. Ghantous said:

    Yes, but if you didn't have the option of using different light intensities, I wonder if multi-sampling could be a decent substitute.

    Well to what purpose? on a monochrome sensor scanner? You could control the camera exposure time if you cannot control the lamp but why bother when precision PWM LED lamp control is a trivial thing to do these days?

     

  12. 5 hours ago, Joerg Polzfusz said:

    But they don’t tell how ORWO managed to get the formula from Agfa-Gevaert: InovisCoat only took over the coating devices from AgfaPhoto. And AgfaPhoto didn’t produce any cine-films. Agfa-Gevaert is still in business and never mentioned having sold any formulas. And ORWO got separated from Agfa in 1945. So, there’s no way that the statement is true - unless InovisCoat also bought some formulas from AgfaPhoto and unless AgfaPhoto‘s last still films have been accidentally based on Agfa XT 320 - without the renktet.

    I honestly don't care if Orwo made a deal with ZUUL and had the formulas for the Agfa 320 smuggled out of Valhalla by Tinkerbell.

    The only relevant thing is a new color film stock and there are some rolls being shot already so it appears to be real and not vapor. 

    After that the only question is if they can make it consistently and at a fair price and stay in business.

     

    • Like 1
  13. Just now, Perry Paolantonio said:

    interesting. The Vieworks cameras and most of the DSLR cameras do more shifts. I wonder if (for the DSLRs) it's to overcome bayer issues? The Vieworks we were going to use in sasquatch originally is a mono camera, and does either 1x, 4x, or 9x shots per frame. The pixelshift in that camera is 0.5 pixels distance, but I see that some (many) of the DSLR cameras do a full pixel. 

    Yeah I have one of those VieWorks too but Rennie found it to be complex to integrate into the Xena especially for the speed.

    I think the Arri (and probably the director?) do a single 1 pixel X-Y shift per microscan.

  14. I ordered some 16mm print stock from Orwo and am ordering some 100ft rolls of the color.

    I hope the stocks are sent in a relatively timely manor.

     

    I am willing to cut Orwo some slack as I cannot think it is an easy business to run and I hope they make it as a supplier of film materials. That said it would be encouraging to see them have a person who really can take care of the communications.

  15. 1 hour ago, Perry Paolantonio said:

    A correction on this - PixelShift uses more than 2 images. Minimum is 4. Some cameras can do even more. An older Vieworks camera we have here can do 9 shifts per image to make a 14.6k image using a 4.8k sensor. So assuming the Director is doing 4 shifts, the number of exposures taken for a 3-flash HDR image of color film would be 36 (3 each R,G,B x 4 sensor shifts)

     

    I think for film scanning the Director and Arri work the same and do one X-Y shift for microscanning, two exposures.

    The VieWorks does 4 quadrant shifts for 4 exposures.

    • Like 1
  16. 1 hour ago, Dan Baxter said:

    FYI I could point out stuff you've said that's misleading like microscaning taking just two exposures. Microscanning was developed for scientific imaging not film scanning, it only works with monochrome cameras, and to make the matrix with the sub-pixel imager shift takes nine exposures to get to 3x the resolution (or four exposure to get to twice the resolution as used in some film scanners). So you take a 1.3K imager, 9 exposures, it's now 4K. Film scanners that do this so far as I know started with 2K-3K imagers and did only 4 shifts at incredibly high speeds.

    The Arriscan was the first microscanning application to film scanning and it is one microscanning step per color.

    So for 3K it is R,G,B +IR for 6K it is R,G,B +IR (step) R,G,B +IR

    And for 3K HDR it is R,G,B - R,G,B + IR and 6K HDR R,G,B - R,G,B +IR (step) R,G,B - R,G,B +IR

    So 14 exposures per frame max in 6K HDR and it runs at about 1.6 FPS in this mode with IR (and that is hardly used)

    The ALEV Mono sensor in the Arriscan is shifted in both X and Y for the microscan

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