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  1. Re: Some 35mm and 120 resolution targets for camera scanning

    He's now offering a Positive version which purports to avoid haloing.

    https://film4ever-digital.blogspot.com/2022/01/type-120-positive-test-target-po69.html
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    Re: Anybody disassembled an Eizo monitor?

    I've never opened one up. I did however ship one to Eizo and even though it was out of warranty they fixed it for me. Replaced the panel itself. It cost me shipping. Their service is stellar and...
  3. Re: Need an electrical plan of the power board of howtek 4500 scanner

    Assuming you are not referring to say, a water leak or cat invasion, and that the PS died on its own, the first thing to do is to replace the capacitors. Just as with most common PS faults they will...
  4. Re: Article on digitalizing film with a digital camera, including color negatives

    Fascinating deep dive on the subject. Given the article's level of exactitude and refinement I'm going to have to give Negative Lab Pro a spin. He's obviously done his homework.

    I wonder how...
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    Re: Repair missing broken tenon

    You've gotten some truly knowledgeable and well informed replies here. Do heed them. Everything you need is within them.

    This sounds pedantic I admit, but rather than calling it a 'tenon', a...
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    Re: Making a scanner with a DSLR

    Do you have any build pics or details on the film carrier itself? Very interesting machine.

    For the pincushion distortion, I'd start by not using Panini projection for output, you should be able...
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    Re: Building a Light Panel

    Interesting read and LED database for those considering a similar project:

    http://indiecinemaacademy.com/complete-led-color-database-cri-tlci-cqs-tm30-15/

    They consider several other factors...
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    Re: DSLR Scanner: Lenses

    Neil, for capture methods such as an X Y stage and linear movement, the amount of invented (interpolated) data is probably far less than say when stitching conventional captures which are projected...
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    Re: Making a scanner with a DSLR

    That would take a lot of belt length, much more so than with other systems. That concerns me. Bottom line is we won't know until you try it : ). Could just work.
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    Re: DSLR Scanner: Light Sources

    Back on the 26th of Oct 2012, in this thread (yikes!) Struan Gray wrote:

    --------------------------------
    "The beauty of LEDs is that you can choose three wavelengths which as much as possible...
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    Re: LED light panel

    Correction, I did have two dead LEDs in the strip I purchased from Lee Valley. They sent me a 12" long strip to replace them for free and they've been doing fine.
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    Re: LED light panel

    Tabor makes some sobering points. In one of my experiments I picked up some chinese 'high CRI' LEDs and upon first powering them up with the properly spec'd power supply several of them began...
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    Re: DIY Open Source Field Camera Design

    I found this quick little weekend project very inspiring:

    https://www.behance.net/gallery/12697013/Making-of-Jirkon-4x5
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    Re: DSLR Scanner: Light Sources

    How could I say no to that offer : ). PM on it's way.

    Ludvig, who is no doubt occupied with his various and many projects, would have something to say about the value of high CRI. He went the...
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    Re: DSLR Scanner: Light Sources

    @PCC, as far as I know, no one has tested such LEDs so the jury is still out on CRI requirements/benefits. I did find a ribbon style LED strip that purported to be high CRI but upon powering it up it...
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    Re: DIY Open Source Field Camera Design

    Following this thread with great interest. Fabricating my own 4x5 has long been a desire.
    I've owned a Chamonix (Phillips inspired, I presume) and an Osaka field camera. The Osaka design was light...
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    Re: DSLR Scanner: Light Sources

    When I heard that they only support Phase One digital backs I stopped pursuing it. I did write them in support of adding Canon, Nikon, etc. support and pointed them to a site on using DSLR based...
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    Re: DSLR Scanner: Light Sources

    I just learned that the Cultural Heritage version supports only Phase One backs. I was hoping to learn a thing or two that could be implemented in my current workflow with Capture One. Perhaps, one...
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    Re: DSLR Scanner: Light Sources

    Anyone interested can request a trial version of the Cultural Heritage version here:

    http://dtdch.com/page/capture-one-ch

    I'm plan to look into to any advantages it offers over C1v8 in...
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    Re: DSLR Scanner: Light Sources

    Good stuff, Bert. Thanks for sharing your results.

    My suggestion, and it's admittedly a shot in the dark, would be to get the best uniformity you can and lock it down. Then make an image of the...
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    Re: DIY DSLR Scanner vs Drum Scanner

    That would be helpful for single captures.

    As for captures intended for stitching, distortion is actually not an issue since the very act of stitching requires that the lens distortion be...
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    Re: DIY Motorized roller base

    I admire your ingenuity Henrim. I'm following this project with great interest.
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    Re: DIY DSLR Scanner vs Drum Scanner

    Is anyone making, or planning to make drum scanners?

    Imagine. A digital capture device using a shifting sensor to deal with the interpolation required by Bayer sensors.
    Thank you, Peter for...
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    Re: DIY DSLR Scanner vs Drum Scanner

    Thanks for that link Will, it's a great write up. Page 34 of their pdf has a processing method comparison I found especially interesting, showing subtle but significant tonality differences.

    Marks...
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    Re: DSLR Scanner: Light Sources

    A late reply (sorry, I was doing summer : )).

    This is an excellent corrective technique for those setups employing a fixed light source as in Peter DeSmidt's first incarnation, a flash based unit....
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    Re: Is a 3D Printed LF camera Possible?

    I attended a meetup with 3D printer manufacturer Type A Machines recently and for the first time held 3D printed plastic parts. I gave them a good squeeze and was disheartened at the fragility....
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    Re: DIY DSLR Scanner vs Drum Scanner

    I'm a little late to the party.

    Jason, please post an image of your problematic DSLR scan results and let us know your magnification when you can.

    As for Dmax/resolution, DSLR's improve with...
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    Re: DSLR Scanner: Light Sources

    Rob, that circuit is fully functional, the code needs an update to support the mosfets though. I'm going to keep at the PCB version and if successful, supply the boards for DIY'ers to solder up, or...
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    Re: DSLR Scanner: Negative Stages

    The Scanduino program makes it a simple matter to dial in the required number of steps regardless of the resolution of the motor as well as whether or not one is employing whole stepping or one of...
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    Re: DSLR Scanner: Scans and Comparisons

    I had a look at your 3D file and it looks very interesting. The butt joints on the upper carriage rails leaves me wondering how well machined those ends will be but you won't know until you try it,...
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    Re: DSLR Scanner: Light Sources

    The one we're presently using is not programmable. http://www.leevalley.com/en/wood/page.aspx?p=70327&cat=1,43349,70322
    That's going to go away however and be replaced by mosfets as in this circuit...
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    Re: DSLR Scanner: Light Sources

    Quote from rbultman in the scans and comparisons thread: "I'm having a hard time visualizing how turning on each color for a specific duration works relative to PWM? Did you try different PWM...
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    Re: DSLR Scanner: Scans and Comparisons

    Rob, let me quote your questions and answer them in the light sources thread Peter linked to.
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    Re: DSLR Scanner: Scans and Comparisons

    I'd be remiss if I didn't mention one big 'gotcha'. Peter discovered there was an unfavorable interaction between the sensor and the LED PWM pulse frequency which resulted in a rolling banding of...
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    Re: DSLR Scanner: Scans and Comparisons

    Some general notes, the DOF I stated was an estimate based on the specific lens and it's fixed f5/6 aperture I'm using. At f/8 and 100mm you will have a lot more in relative terms. It's such a...
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    Re: DSLR Scanner: Scans and Comparisons

    Could you save that again for a previous version, I can't open it as it's newer than my Sketchup version, 2013.
    As for the fixed lamp approach, if you can get a consistent exposure and 1 or 0 points...
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    Re: DSLR Scanner: Scans and Comparisons

    I'd love to see the sketchup file, sounds fascinating. I'm now working on a circuit board for Scanduino which should be adaptable to many systems such as this.
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    Re: DSLR Scanner: Scans and Comparisons

    Here's a resolution test using a D7100 and Magnagon 75mm f/5.6:

    112275

    Looks to me like group 6 element 5 is resolved putting it at 5160 spi. Yikes!
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    Re: Remote Mechanical Shutter Release

    I had a look around there but did not find what you were referring to, Randy.
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    Re: Remote Mechanical Shutter Release

    I see you used high quality rubber bands there : ). Are you using a joystick type controller to flip the servo down?
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