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I was searching for a high acutance developer and went back to Hypercat, a developer I tried some years ago. Sources are OK about Stock Solution B but for A there are two versions:

In the official...

Yes, and I think this one being offered over here has only 6 out of the 7 cells. I will check it out and probably let it go.

More info:

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Thank you Ron, with the key word you gave me "Bistigmat", I was able to find a lot more information on the web and also in other threads over here in LFPF.

The lens displacement when the lever is actuated is so long that it makes me think it could be in a camera without bellows. It is a small lens, all the way forward it will probably focus a short...

It is Rodenstock, I picked this picture because it gives a reference of size. But there are others with engravings.
You are right about the helical. Only now I paid attention to the video. Auction...

This Rodenstock lens set is being offered over here in Brazil at ~200 euros price. Glass is nice but there is one broken iris blade inside. I don't know anything about it and searched for Rodenstock...

I made some pics with it. Here is dry plate portrait 18x24 cm. Contact printed on Fomatone MG Classic. I trained negative retouching with this one. Didn't want over do it and maybe end up leaving a...

Hello, I would like to share with you a project that may be interesting for those doing printing processes using UV light. The idea is a device that allows you to print using sunlight and get...

If that helps: I have a Verito 18" f/4,5 #15204 with iris and without any shutter. Total length is 7 1/4" (184 mm). The flange is positioned at the rear of the lens.

I like the idea of removing the old varnish and applying a new one when the barrel becomes plenty of flaws and stains. But I see and almost understand that some people consider that a sort of...

I am wondering whether it is a regular Aplanat with two pairs of flint or a variation made by Steinheil, from 1874 to 1881, combining F+C - C+F. These are told to be brighter (Agostini) and having a...

Yes, it is 9780.

Yes, thanks Ron, they are similar in proportions of their different elements. Corrado Agostini (only now I realised that I wrote "Corradini", in my post, sorry by that, it is now correct) mentions a...

Drew, brass is not suitable for laser cut and I don't know what kind of machine and file is used to cut it to a certain shape. I sent already Waterhouse stops files to laser cut, the material was...

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It was always a problem for me to produce Waterhouse stops when they are missing in a vintage lens. Recently I tested with 3D printing and it worked so well that I am sharing the idea here...

It is not that difficult to measure them: https://apenasimagens.com/en/measuring-lens-aperture/

Any clue about which lens is this amongst the Steinheil's different designs and uses? It seems to be symmetric. Barrel diameter is 70 mm. Height is 150 mm. Serial number, according to Agostini,...

I use shellac, very diluted in alcohol, with black dry pigment. It works very well.

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Two years ago I published an adaptation of a Durst Laborator 1000 replacing condensers by a LED box. The project used an old TV remote control and had some points to be improved so I did...

I was tired of doing always the same calculation whenever I was asking myself "what can I do with this lens in this camera", so I made an online simulator that I can check in my mobile phone. One has...

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Doing a quick & dirty test: when lens hood is facing the scene, image is OK, but in fact iris is not in the right place for a Heliar, it is close to the front element. But...

Thanks everybody for the useful information. And yes, the ,5 is almost gone but it is there. It is a f/4,5. The serial number is 108353, not so sure about the 8 as it is almost gone too. Maybe it was...

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Hello, a friend of mine gave me this Heliar 42cm. The barrel is un lousy condition but iris and glass are quite OK so I would like to put it back to work. I found strange that the way the...

Thank you all for the recommendations and considerations. I ordered already a Synthetic Balsam and expect to post here a beautiful restored Verito 18" and a couple of days. Regarding solvent for UV...

Nodda, thanks for your recommendation. I saw my friend cementing doublets of his production and he does it the way you described. But he said that the solvent is so poisonous that in case of problems...

Hello,

I bought a Wollensak Verito 18". Glass is in mint condition except for an almost 1/2 inch thick ring of balsam oxidation. I have a friend with a small optics workshop (he produces prisms,...

Hello, I've been using 510 Pyro for quite a long time. Specially with HP5 20 min 20ºC stand development, it has given excellent results. But for some time now, in Brazil, where I live, it is...

I also have a Wray, serial number is 490. It seems to be a RR. I found some entries about Wray in the British Journal of Photography, for instance, in April 14th, 1893, there is a nice report about a...

I always believed that this would be a high precision work. Impossible to be done at home, with manual tools. But I tried and it worked very well. I am still surprised how easy it was. So I am...

I recently acquired an old Planar mounted in a Bausch Lomb shutter and I was not able to figure out how it works. I understood where and how speeds and apertures are set but not quite about how to...

Thanks for sharing!!

Paul, I think that this may be a useful simulator for you: https://apenasimagens.com/en/focal-length-distances-and-framing/

Rudi, good point. I will check it out and let you know. I am still working on a camera to fit this lens. Cheers

No, I took for granted what is written on that catalogue (posted above) mentioning that the portrait Nº 5 should be 310 mm. Do you think it could be otherwise?

I tested it. The attached images show a portrait made with a Derogy Rapide nº4, Petzval type, 223 mm focal length, fully opened, serial number 40022. I used FP4 9x12 cm. First of them I just kept the...

Pere Casals, beautiful picture!!! It is intriguing how come that the lens could focus on the girl and also on the bushes that seem to be half the distance. Otherwise it illustrates the rule of 1/3 of...

Scott, that is what I want, thanks for sharing. What I still don't know is whether with the lens fully open, f/3.7, aiming the lens axis to where one wants sharpness, would provide a significant...

My problem is that I am using a Linhof Tecknika 13 x 18 cm with 4x5" back. This camera has so little lens fall (for faces on the upper part of the frame) that I will have to use angles: tilting the...

Let us say that you have a half body portrait to make and you want to use a Petzval lens. According to your composition the sitter’s face is not at the center of your frame (where you get Petzval’s...