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  1. Replies
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    Re: Repairing a cursed Polaroid 8x10 processor

    Nothing to be afraid of, a varistor has no capacitance to speak of so it won't have a voltage over it after a time. It is a bit more complicated.

    A varistor is a resistor that has a resistance...
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    Re: Cable release thread

    That's a straight thread, not a tapered one.
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    Re: Kodak Supermatic aperture scale question.

    I don't think that this matters in this case. You set the start of f/3.7 "mechanically". The rest you do by halving light measured at the same spot. You're measuring ratio's, not absolutes.
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    Re: Repairing a cursed Polaroid 8x10 processor

    A varistor is a protection decvice. When the voltage goes above its rating, the resistance drops and it becomes almost a short circuit. Something like a "large" varistor can dump about 10000 A for...
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    Re: Repairing a cursed Polaroid 8x10 processor

    That's not a capacitor but a varistor. It's used as a overvoltage protection. So if the circuit was for 110V and they put 230V on it, then it is logical they are defect. You should change them both....
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    Re: Affordable 8x10: Any Other Game than Intrepid?

    I love that 4x5. Nice and simple.
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    Re: Affordable 8x10: Any Other Game than Intrepid?

    That looks like fun!
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    Re: Affordable 8x10: Any Other Game than Intrepid?

    Might be. IF (big if) you already have some experience with working the materials to construct the camera, have the needed tools already and have easy/cheap access to materials. Not to mention time....
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    Re: Affordable 8x10: Any Other Game than Intrepid?

    All big shops where overrun with people buying toilet paper when the corona crisis began.... this is not a way to run a business! They need a business plan and logistics! They should not be in this...
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    Re: Using 3D print for Waterhouse stops

    No, you are correct. Search for something like "fablab". They mostly have 3D printing and laser cutting available. For laser and water cutting metal for my live steam engines I just ask a place that...
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    Re: Using 3D print for Waterhouse stops

    Brass can be laser cut but not many companies do it because it needs a special head.

    Watercutting is a better option. But if you need 0.8mm or thinner I'd look at etching. Or it could be routed...
  12. Thread: Single Travel

    by Havoc
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    Re: Single Travel

    Always have a few in the car. Costs almost nothing, can be used for a lot of things.
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    Re: Lens Aperture vs Meter Reading

    I'm going to read the manual fo my L-758 again. This is not as I understood it to be.
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    Re: How to start working on a shutter?

    Good question. I received it as a gift from someone that has a whole collection of them. Looks like a 010 with a Xenar.
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    Re: How to start working on a shutter?

    Thanks for the ideas. I'll look at the Compur-rapid shutter videos, there is a Retina involved so that is handy as a start. It works but is sluggish. Just must find a way to store those youtube...
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    How to start working on a shutter?

    I have here a couple of shutters (Compur, Synchro-Compur, Ilex, Prontor...) that have various problems. Some are blocked, some have the slow times that stutter, some don't stay cocked and other...
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    Re: Iron ring on brass lens - possible to get off?

    The problem is not working to exact standards, the problem is that you are effectively working blind. Like If the brass is not round because it had a bang before the iron ring went on. Or if it has...
  18. Re: tri-color photography with oneshot camera: exposure?

    The original filters are indeed marked 47, not 47b. As it is a one-shot, I can not give blue more exposure than the others unless I start adding ND filters in the red and green path.

    Ok, let's...
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    Re: Iron ring on brass lens - possible to get off?

    Isn't that a bit dangerous? You have no idea of the form of the brass underneath the iron ring.
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    Re: Iron ring on brass lens - possible to get off?

    In model engineering, they use a saturated solution of alum to remove iron/steel broken taps and screws from brass. But in that case you need to be sure there is no other "iron" part other than what...
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    Re: Human sized camera

    Ok, perhaps a silly idea, but if you want it totally "green" have you thought of photosensitive organisms? There has been research around that years ago. I read about this when reading about the...
  22. Re: tri-color photography with oneshot camera: exposure?

    Only issue is that 6.5x9 isn't 2.25x3.25 so I would need 2 different sizes of film right now. It will have to wait until I can get 3 identical 6.5x9 film holders. Cutting film in the dark is one...
  23. Re: tri-color photography with oneshot camera: exposure?

    I was thinking on just using the original filters just in order to know everything more or less works. If that is the case I would replace them by LEE color separation filters as they are damaged. No...
  24. tri-color photography with oneshot camera: exposure?

    So I now have 2 oneshot tricolor cameras. And I really would like to use them (at least once to prove it can be done). So I'd like to get a sensible idea about exposure for this.

    The camera splits...
  25. Re: Idea pitch: Electrochromic glass shutter, would it be possible?

    What about a moving/rotating mirror? It would require rethinking of the camera and way of composing. Like the rotating mirrors used for scanning labels or the line scanning "helical" in the beginning...
  26. Re: Idea pitch: Electrochromic glass shutter, would it be possible?

    I think it would be far more easier and faster to get an electronically controlled curtain shutter set up and working. Or one scale up one of those DSLR shutters. With film on a normal day and 4x5...
  27. Re: Idea pitch: Electrochromic glass shutter, would it be possible?

    A Kerr Cell? A blank tft screen? But all are based on polarisation so light loss is at least 50%.

    On the other hand as film is so slow I don't need fast speed shutters but very long time shutters.
  28. Re: My mind is blown by recessed board difficulties, any suggestions?

    Got a 75mm on a flat board with my Wista and it is not easy to use. Mostly because the standrad bellow is in the way. But far easier to use than the SA 90 on a recessed board...
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    Re: New Wooden Filmholder

    Very nice workmanship, I love them.
  30. Thread: 4x5 Starter Lens

    by Havoc
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    Re: 4x5 Starter Lens

    While I can see your point, I cannot say this is what happened to me. I preferred the 35mm in 135 format and with 4x5 I go even wider. I cannot see what "separating the film plane from the lens...
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    Re: Interested in 4 x 5

    Depends on use and taste I suppose. While the 105mm on my Fuji G617 is "a bit" longer than 90mm I don't find it too wide. But then I love wide angles.
  32. Thread: 4x5 Starter Lens

    by Havoc
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    Re: 4x5 Starter Lens

    Like you my most used lens on 135 film is the 35mm. So I feel most at home with a 125mm on 4x5. This lens always comes out with me. I choose a Fujinon CM-W 125/5.6. Can't say it was that expensive.
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    Re: Interested in 4 x 5

    At last I got to the point where I realised that. Whatever camera, film, lens, process I use, I'll never be able to make good enough use of it to make a difference.

    Somehow at the back of my head...
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    Re: Interested in 4 x 5

    Monorails have more movement while field cameras are easier to take outside. I went for a field camera because I want to take it outside. Got a Wista 45 because easy to find, sturdy and reasonably...
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    Re: Hole Saw For Commercial Ektar Lens

    While I agree with most said, I would never put a thin, flat piece like a lens board in a vise. A vise clamps 2 sides and will bow the board. I'd use a piece of new MDF under it (these are more than...
  36. Re: "contamination" between b/w and C41 chemistry?

    Ok, so I'm overthinking it. "Paralysis by analysis" as it is sometimes said on this forum.

    But if I can keep the stabiliser in a separate container it will save time cleaning and washing up. Which...
  37. "contamination" between b/w and C41 chemistry?

    Right now I've only done b/w development. But I do have quite a lot of color negative film around so I thought I'd try C41 development. But I've read so much about keeping all those chemicals...
  38. Re: Comparing the Toyo 45CF and the Super Graphic

    Interesting info. It is always great when companies evolve and sometimes keep an active link with their past. I searched to find the company but I found more than one Toyo company. One making tires,...
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    Re: A simple and practical 4x5 snapshot camera

    Not only that, sometimes I just don't want to take more than 1 or 2 photos and develop them within a few months.
  40. Re: Repair rack and pinion lock for extension rail

    Soldering with a soldering iron as in making electrical joints is not very strong mechanically. Silver solder (high percentage silver) as used in brazing is much stronger but this is to be done with...
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