None of these lenses have a built-in shutter, as is commonly found in newer large format lenses. The lenses must therefore be used with a separate shutter, which is located in front of or behind the lens. Few newer cameras offer this option, so using film at least at full aperture is difficult because of the fast shutter speeds.

The Dallmeyer 1A is just small enough for use with a Sinar behind-the-lens shutter Because the flange is relatively far forward on the lens, a plate with a 27 mm extension is required. I had such a plate made for me using 3D printing and used it for the picture taken at the cemetery with the Sinar 13×18. But before the next use, the plate broke without any external influence and the lens almost fell off. Since the lens is comparatively light due to the aluminum barrel, the risk of a plate breakage with heavy lenses is likely to be a lot higher. I can only strongly advise against using such plates for mounting high-quality lenses.

On the photo with the broken plate you can see that an adapter ring 77-82 is screwed into the lens at the front. The lens does not really have a thread, but the ring can still be screwed in. This ring is useful for a standard protective cover or for filter attachments, especially for strong gray filters when used outdoors with an open aperture.

Für Kollodium Nassplatten kommt man aber wegen der langen Belichtungszeiten gut ohne Verschluss aus. Ich habe das Objektiv also  wieder auf eine flache Sinar-Platte montiert und nehme einen Verschluß wie Anno dazumal. Mangels Zylinder halte ich bis zur Belichtung das Einstelltuch vor das Objektiv, zähle dann die Sekunden und decke es wieder ab.

Why and how I use this lens

One is inclined to believe that a lens that is a hundred years old does not provide good image quality. In fact, you can use it to take much sharper images than most people assume. Dallmeyer's lenses had an excellent reputation for good reason, and they still have it.

If you want sharp images, you can have it cheaper with a modern large format lens. However, the Dallmeyer patent lenses of series A and B have two special properties that modern large format lenses do not have.

On the one hand, they are faster than practically all modern large format lenses, so that a significantly smaller depth of field can be achieved. I therefore only use the lens with an open aperture.

On the other hand, these lenses are used for larger formats than specified. The Dallmeyer 1A is a 4×5 inch lens, but I practically always use it for 5x7 - almost twice as big. So it is kind of like using an APS-C lens for full frame. The Dallmeyer lens has few problems with this; it manifests itself in somewhat darker edge areas with a blur characteristic often referred to as swirly bokeh. The latter is less noticeable in the studio, however.

Virtually all of my 5×7 inch wet plates were shot with this lens. But I also use it for portraits and nudes on film. With one exception, I do not use a flash for this, but rather continuous light - either intense HMI light for wet plates, or pilot light for captures on film. All pictures are therefore taken with exposure times of around one to eight seconds. This is far from common today, but it is one of the reasons why these images have a different effect that also characterizes historical photographs. If you want to find out more about it, you are sure to read the Interview with Paolo Roversi. He is one of the most renowned fashion photographers and also photographed the Pirelli Calendar 2020. Even if he works digitally for it, you won't find a flash in his work.

Because of this reference to historical photography, my series of portraits and nudes on film is named "Century".

I now have other historical lenses for smaller and larger formats, but the principle behind the pictures is always the same.

The Dallmeyer 1A may not be a showcase, but it is one of my most important lenses. Others know that too, and such lenses are correspondingly rare. Above all, they are bought up by dealers in order to then drive up prices sharply. I just saw an offer for a brass version of the Dallmeyer 1A for which over € 2000 was being charged. The actual value is more like around € 800, for a Dallmeyer 3B around € 2000. That is a lot of money, but if I look at the current prices for modern lenses for digital cameras, then with a historical lens I not only get a rarity but also a lot more for the money in terms of photography.

The pictures on the right from the "Century” series were taken on film with the Dallmeyer 1A lens, those below are from my galleries with collodion wet plates, most of which were also made with this lens.