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Who cares about what his/her heirs have to figure out. Maybe time they start using their brains instead of tapping away on their smartphones. And if you have to sleep on the porch because of an extra...

Roger Ciala gave some method of determining it yourself. Must be somewhere on the lensrentals blog I think.

I have no clue what you are going on about the line of sight and true range distance. An...

Just as less lenses will lead to less shots taken.

That was my impression as well: beginning separation.

I'm not going to contradict you that compensation for parallax and exact framing are next to impossible, how are you going to have exact framing and parallax compensation with a phone that is not...

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.

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...

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...

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...

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.

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...

From what I find in the documentation of filters is that wideangle lenses follow cos³. The cos⁴ and cos (no power) is more for "contactcopy machines with point source light" and large format copy...

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...

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...

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.

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...

I really like that! But I says "still in prototype". Anyone knows if they went into production.

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...

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...

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...

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...

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...

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...

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.

I just like my Fujinon SWD 75. The SWD 90 is also nice but heavy.

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.

Looks like a mechanical version to me.

Wista 45 and Fujinon CM-W 125.

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...

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...

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...

Well, balsa is a hardwood...:rolleyes:

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...

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...

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...

Those polyester cost more than new gelatine!

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...

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...

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...

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...