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  1. Replies
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    Re: Pinhole Photography in 8x10?

    Ok, got it! I really like it, think I'll try it. Got enough plastic and metal pipes around to give it a go. When the weather is better, I'm not really an outdoors person.
  2. Re: Calculating f-stop progression . . .how are the numbers derived?

    Aperture controles light intensity. So it controls the SURFACE of the opening of the diaphragm. But it is expressed as a ratio of linear dimensions. Doubling the surface is done by making the...
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    Re: Pinhole Photography in 8x10?

    Wow... Can you put a photo of the setup and explain a bit because I can't follow very well your explanation of controlling the exposure by sliding a tube on the outside. But this is really...
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    Re: getting glass CLEAN, how do you do it?

    It doesn't need to be chemically clean. But it needs to be without streaks and grease free. I need to glue new gels between the recuperated original glass plates. And so far I didn't get that. I also...
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    Re: getting glass CLEAN, how do you do it?

    Now that is a good point! Hadn't tought of it to be honest. I was using acetone, metryl, isopropyl and kept getting streaks. But I was also always using wipes from the same box.
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    Re: getting glass CLEAN, how do you do it?

    Wow, so many methods. The dish wash stuff worked well. But the technique for doing so I still have to work on. The telescope mirror method is next on the list. I don't have silvering on it is a bit...
  7. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    From what I find in the documentation of filters is that wideangle lenses follow cosł. The cos⁴ and cos (no power) is more for "contactcopy machines with point source light" and large format copy...
  8. Re: How to make a sports viewfinder or wire viewfinder?

    A wire viewfinder is nothing else then a fancy version of the cut cardboard and string "composition aid". Sometimes you see written that people advise you to get a piece of cardboard, cut out the...
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    Re: Opinions on grafmatic

    I have 2, gave them a good clean. As far as I can ascertain the septums are fine. But so far I have not a single negative out of them. All or not exposed, or complete overexposed. And no, I did not...
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    Re: getting glass CLEAN, how do you do it?

    I tried with dish washer and that is so far the best. I'll try next time with H2O2 and ammonia. Then getting alle the dust off.
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    getting glass CLEAN, how do you do it?

    Ok, so I now have a sample of gel to glue between 2 glass pieces. I have my canada balsam. So the next step is to get the glass CLEAN. And I mean clean...

    I tried window cleaner and spectacles...
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    Re: Prototype RF-coupled 4x5 camera

    I really like that! But I says "still in prototype". Anyone knows if they went into production.
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    Re: Prototype RF-coupled 4x5 camera

    3 sheets instead of 2 sheets is a 50% inmprovement. That's progress to me. As I have not had any successful use of a Grafmatic I disqualify it. Now I do admit that having to lug around a lenscone for...
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    Re: Prototype RF-coupled 4x5 camera

    It might not be unique considering the history.

    But it is unique NOW. AFAIK there hasn't been an interchangeable lens 4x5 camera with RF made this century. Certainly not one where you have NOT to...
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    Re: Prototype RF-coupled 4x5 camera

    It has 3 compartments that can hold a sheet of film. They form a kind of serpentine. Film is transported between them. No idea how he wants to do that, but from what I see is that the film has to...
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    Re: Which are the fancy lenses??

    This assumes that everybody has the same vision/taste/style (strike what is not appropriate). 90mm is far too narrow for me to serve as a wide. Even the 75mm I have is borderline. I don't really care...
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    Re: Prototype RF-coupled 4x5 camera

    I had not read it only holds 3 sheets. If that is the case, then indeed it isn't better than normal holders. It should hold at least 12 in a volume not much larger than a grafmatic and certainly not...
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    Re: Prototype RF-coupled 4x5 camera

    I love the idea of the film magazine. I was thinking along similar lines for making such a thing myself. But I'm a bit sceptical about him bending the sheet that hard and not getting it scratched...
  19. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Indeed, I have both and because limited distance to subjects a 75mm is more useful for me then a 90mm. But then that's me.
  20. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    I just like my Fujinon SWD 75. The SWD 90 is also nice but heavy.
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    Re: Ilex Acme 3 shutter?

    I think you need to put it at T to open the shutter. No separate lever to open the shutter for focusing. My ilex n°4 is like that.
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    Re: Ilex Acme 3 shutter?

    Looks like a mechanical version to me.
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    Re: What's your Go To LF body & lens?

    Wista 45 and Fujinon CM-W 125.
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    Re: One way to fix lens separation

    Ok, so you mean that when canada balsam let go, it doesn't really forms air space but it kind of swells and its optical properties change to opaque.

    I did have 2 lenses with canada balsam...
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    Re: One way to fix lens separation

    I don't understand this. Ok, the canada balsam may not be a solid. But the glass is. So you have separation or not. The newton rings are not dependent on how slow the separation evolves, only on how...
  26. Re: Diy tripod, plans, advice and links to plans please

    I fear a lot of these tests just are done to proof whatever is wanted to be proven. I do have a wooden Berlebach but honestly, I don't trust it to hold a Minox. Those clamps on the legs are just not...
  27. Re: Diy tripod, plans, advice and links to plans please

    Well, balsa is a hardwood...:rolleyes:
  28. Re: Wish I had researched a bit on the Wista 45D

    I'm pretty sure you can replace the back. Finding one that is cheaper than a very used Wista 45 is another thing. Maybe ask Kumar here on the forum. I understood he isn't as active in selling anymore...
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    Re: mounting gelatine filters between glass

    They use an internal numbering (unless that is the Agfa numbering) but can provide according to Agfa or Kodak numbering. Or to specification. Also neutral density (including center filters for...
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    Re: mounting gelatine filters between glass

    Drew, I bought a set of Lee "polyester technical filter" (R, G, B) 100x100 and that was 36 euro/piece. The gelatine filters are made by a german company that casts their own sheets and they quoted 26...
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    Re: mounting gelatine filters between glass

    Those polyester cost more than new gelatine!
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    Re: mounting gelatine filters between glass

    The filters I'm looking at (and will try) are newly made gelatine filters. The green is out of stock and will take some time for new to be made.

    Can someone point me to measurements/articles that...
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    Re: mounting gelatine filters between glass

    Well, I do have some old slide MF glass around, they are sending me a sample of the gelatine filters. So I guess that ordering some canada balsem and reading that nasa article a few times is in...
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    Re: mounting gelatine filters between glass

    Replacing them by resin had been my first idea. That's why I ended up with the Lee polyester ones, but those are thin sheets. Not the solid thick ones I had expected. I haven't been able to find any...
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    Re: mounting gelatine filters between glass

    Problem is that this is for a tricolor camera, they don't go before the lens, they are mounted just before the film holders. There is no way to mount the gel. I'd have to make holders that are about...
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    Re: mounting gelatine filters between glass

    Interesting article. Looks a bit terrifying to be honest.

    I hope you mean that glass is 0.063" ;) It could work, there is some margin for slightly thicker filter assemblies. Maybe I should visit a...
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    mounting gelatine filters between glass

    I need new filters for my tricolor cameras. I have now found a place that can sell me the right gelatine filters. Only problem is that they cannot mount them between glass. I took apart one of the...
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    Re: Help with Super Topcor 5,6/120?

    Almost deleted it thinking it couldn't be that. Happy to help.
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    Re: Help with Super Topcor 5,6/120?

    Probably a very stupid question, but you do have the shutter cocked?
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    Re: Help with Super Topcor 5,6/120?

    Sorry, that is my mistake. Not a native english speaker.
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