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  1. Re: Midtone Machines - Automatic Film Processing Machine

    New blog post, sorry it's been a while:

    http://midtonemachines.com/news/the-programming-continues/

    Programming is more or less complete for now and the machine is nearly at the level of...
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    Re: Large Format Landscapes

    Cheers, if I had to guess I'd say it was just the lighting changing, there was small banks of heavy cloud passing the sun every few minutes so it was hard to judge when to take the shot.
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    Re: Flowers Anyone?

    A bit of a slide vs. colour negative film comparison. Velvia 50 on the left, Ektar 100 on the right (both 4x5).

    https://live.staticflickr.com/65535/48851654507_275c0ec16f_c.jpg...
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    Re: Large Format Landscapes

    A bit of a slide vs. negative comparison, Ektar 100 on the top and Provia 100 on the bottom. Kinda prefer the Ektar but that might be more because of the change of lighting between shots.
    ...
  5. Re: Professional Home film processing 4x5 neg

    Applications like these are one of the reasons I'm currently working through designing a new automatic film developing machine, unfortunately it's a ways of being ready for sale yet:...
  6. Re: Midtone Machines - Automatic Film Processing Machine

    New blog post is up:

    http://midtonemachines.com/news/let-the-programming-begin/

    I've started wiring and programming the machine now, can make the valves open and close and the motors spin...
  7. Re: Midtone Machines - Automatic Film Processing Machine

    [/QUOTE]

    One of the servo pinch valves has done 16000 cycles before I stopped the test (no failure). I'll be using the prototype machine for all of my personal photography once it gets going,...
  8. Re: Midtone Machines - Automatic Film Processing Machine

    $1500 USD for 10 machines worth of parts (not just the develop tank, but also a few other parts used elsewhere in the machine). Speaking of which, the parts arrived today and they look great!
    ...
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    Re: Large Format Landscapes

    Three shots on Provia 4x5, all of the same scene but slightly different angles and times of day. Which one is your favourite?

    https://live.staticflickr.com/65535/48772989816_e53bc56d74_b.jpg
    ...
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    Re: The Setup and the Shot

    Home developed 4x5 Provia slide film, turned out lovely!

    https://i.imgur.com/6M4kW5gl.jpg

    https://live.staticflickr.com/65535/48772989816_e53bc56d74_b.jpg
  11. Re: Midtone Machines - Automatic Film Processing Machine

    Yep I have 10 sets of parts on the way with vacuum cast PU, I hope they're bulletproof! Luckily with a set of 10 of everything coming I can sacrifice one or two tanks to destructive testing with some...
  12. Re: Midtone Machines - Automatic Film Processing Machine

    The 3D printed one wasn't really the correct material for fully functional testing, it wasn't black and opaque for keeping light out and the heat deflection temperature of the resin isn't really as...
  13. Re: Midtone Machines - Automatic Film Processing Machine

    Just dropped the hammer on getting 10 production prototype develop tanks made, and a bunch of other parts required to continue building up the machine, watch this space! I'm really trying to get this...
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    Re: Large Format Landscapes

    Two shots of 4x5 Ektar, unfortunately there was heavy cloud that came through blocking the golden hour light but they still came out OK.
    ...
  15. Re: Midtone Machines - Automatic Film Processing Machine

    New blog post, now with a video of the develop tank filling and draining! The pinch valve is over 16000 cycles without problems and the sheet metal components have arrived. It's really starting to...
  16. Re: Midtone Machines - Automatic Film Processing Machine

    I've added a bit of a 'trench' to the bottom of the develop tank to allow fluid to better fill/drain, I've taken some video of the process yesterday but now I need to learn how to edit videos to chop...
  17. Re: Midtone Machines - Automatic Film Processing Machine

    I can only imagine how large and heavy the molds were for that! The vacuum forming production tooling I'm looking at is machined aluminium and I believe they also include heating and cooling in the...
  18. Re: Midtone Machines - Automatic Film Processing Machine

    I know it's been a while since my last blog post but I haven't spent all of the time sitting on my hands, new post is up:

    http://midtonemachines.com/news/sheet-metal-and-valves-oh-my/

    Sheet...
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    Re: New (to me) Chamonix 045N-2

    I only got one a month or two ago as my first large format camera and I love it. Obviously no other LF cameras to compare to but I have other new and old cameras as a baseline. I really love how it...
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    Re: Large Format Landscapes

    Cheers! It was shot at a place called Matapouri on the north island of New Zealand, I was just up there for the weekend. 'Scanned' with my Sony A7RII and a macro lens with a light table to illuminate...
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    Re: Large Format Landscapes

    Chamonix 45n-2, Ektar 100, polariser and 3 stop soft GND. It was blowing a gale and I was a bit rushed for time but I think it turned out pretty well.
    ...
  22. Re: Midtone Machines - Automatic Film Processing Machine

    Calebarchie, yeah sorry I've been very busy with my day job (https://www.rocketlabusa.com/) and trying to get a friend to assist with the control electronics side. Also trying to get some quote and...
  23. Re: Midtone Machines - Automatic Film Processing Machine

    Yeah it's very similar to the Phototherm. I originally wanted to go along a different route but as I was designing I realised that there's a lot of good reasons for it to look that way and if made...
  24. Re: Midtone Machines - Automatic Film Processing Machine

    Cheers. I got some quotes early on and once you include tooling costs it seems that the cross-over point where injection molding starts to make sense is about 350 parts. Honestly I'm not sure I'll be...
  25. Re: Midtone Machines - Automatic Film Processing Machine

    New post is up, showing off some 3D printed parts I got for fit-checking the develop tank and a few other parts of the machine:

    http://midtonemachines.com/news/3d-printed-goodies/

    Everything is...
  26. Re: Midtone Machines - Automatic Film Processing Machine

    Same principal as peristaltic pumps except just closing or opening the tube rather than pumping liquid. Not using peristaltic pumps for the actual pump part of the machine because they're not...
  27. Re: Midtone Machines - Automatic Film Processing Machine

    For a variety of reasons I'm currently going to use pinch valves, essentially the valve is a section of silicone tube that is squished to prevent flow. It's a fairly common technique in...
  28. Re: Midtone Machines - Automatic Film Processing Machine

    Yes the plan is to periodically reverse the direction of rotation, there is also quite a bit of axial clearance for the spindle which will result in some displacement during agitation. I'm not...
  29. Re: Midtone Machines - Automatic Film Processing Machine

    The heating pad under the drum will be closed-loop controlled, I'll probably have to do some experimentation to work out how much higher than the process temperature it will have to be to account for...
  30. Re: Midtone Machines - Automatic Film Processing Machine

    I got a few quotes for representative parts in the early days both for vacuum resin casting and injection molding (offshore manufacturers). The cross-over point where injection molding made sense...
  31. Re: Midtone Machines - Automatic Film Processing Machine

    Yes the bulk of the heating is done using an immersion heater in a separate tank prior to pumping into the development tank, heating the development tank is just required to prevent the chemicals...
  32. Re: Midtone Machines - Automatic Film Processing Machine

    Peter, the now discontinued Phototherm used a very similar tank and I can see why after going through the design process myself. Because the liquid level never gets above just under half-way up the...
  33. Re: Midtone Machines - Automatic Film Processing Machine

    New post, this time with detail of the developing tank design.

    http://midtonemachines.com/news/the-develop-tank/

    I've also included a shot of some parts I've ordered in for prototyping and I...
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    Re: Large Format Landscapes

    Keyhole rock. Chamonix 45n-2, Fujinon 135mm, Ektar 100 home processed and DSLR scanned.

    https://live.staticflickr.com/65535/48421248626_2de9e3225f_b.jpg
  35. Re: Midtone Machines - Automatic Film Processing Machine

    Pretty clever, and definitely something I could imagine making work in the machine.

    Maybe of interest I got a quote from the only place I'm aware of in my country (New Zealand) that processes E-6...
  36. Re: Midtone Machines - Automatic Film Processing Machine

    New blog post is up:

    http://midtonemachines.com/news/meat-and-potatoes-fluid-diagram/

    This time I've shared the fluidic system diagram and gone into some detail about how the chemicals move...
  37. Re: Midtone Machines - Automatic Film Processing Machine

    Can your washing machine dilute from any quantity of powder/concentrate or do you have to add the right amount for every load? Currently the machine doesn't have the capability to mix solution...
  38. Re: Midtone Machines - Automatic Film Processing Machine

    New blog post up, details of a survey I put out a month or two ago:

    http://midtonemachines.com/news/a-slice-of-pie-charts/

    There's also a link at the bottom of the past to the survey if you...
  39. Re: Midtone Machines - Automatic Film Processing Machine

    Do the JOBO expert drums show any issues with chemistry not getting to the back of the film? I've used the 'taco method' for developing my 4x5 sheet film with a hair band to hold the film and there...
  40. Re: Midtone Machines - Automatic Film Processing Machine

    Thanks for the replies so far, keep 'em coming.



    One of the inputs to the machine would be water for rinsing/flushing (tap or deionised water depending on you preference). After the process is...
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