Wednesday, March 8th, 2023

Shooting an ultra fast lens (140mm F1.0) with an ultra large format camera

In short words “this lens is something else”. It’s extremely fast, huge and has a strange focus distance. It was used in Sony CRT Projectors from 1997. I bought it some years ago from a very interesting guy. He had so many more great stuff in his shop and I regret that I did not buy more. It took me some time to find the right opportunity to use that lens. But I think it was worth the waiting. I am glad my friend and former workshop participant Alois Stingl came over with is wonderful ultra large format camera.

Before I could use it, it needed some cleaning, I used a cloth that was soaked with water and just put it on the lens without wiping to avoid more scratches.

with some patience I could clean it.

I measured the lens at infinity to calculate the F-Stop. I measured 135mm and the front element was 145mm That is about a F0.9 lens. But a document I found on the internet told me its more an F 1.0 lens. Still crazy fast.

You can see here how short the focusing distance is. That makes it hard to focus un an ultra large format camera.

When I saw the yellow coating on the front element of the lens, I thought about Mathieu Stern’s video about radioactive lenses. If it really is made of Thorium, it is indeed radioactive, but only for a very small amount. Watch Mathieu’s video to learn more about this Material

Thorium was used to get more light into the lenses back then.

Because the lens is very fast it is still dangerous. If it focuses the sun on something, it will start to burn immediately. That’s the reason you should not put the lens near a window and always put a lens cap on it.

In the video I will show you how easy you can start a fire with that lens

I thought it would be interesting to calculate the crop factor of an 40x50cm ultra large format camera. If you use the common formula to calculate crop factors you will see that this plate size has a crop factor of 0.0067 compared to a full frame sensor. With that you also can calculate the comparable depth of field F-Stop. This would also be F 0.0067 compared to F 1.0 on a full frame camera. When I tried to focus on the ground glass, I could barley find something in focus. Thats why you see me focusing for a very long time.

it took quite some time to focus with this very fast lens.
I think this shows pretty well how sensor and plate sizes compare

But there is more. a 140mm lens is a tele lens on a full frame camera, but it’s a wide angle lens on an ultra large format camera. This is because of the bigger plate size of the ULF camera. listen to my full explanation in the video.

My drawing shows in a simple way that the subject needs to be farer away from a full frame sensor the get the same angle of view as the close setup of the ULF camera.

To “connect” the lens to the camera, I designed and printed a basic flange in Tinkercad. It needed some pool line and tape, but eventually it worked out.

I think Tinkercad is one of the most yeas to use tools for 3D printing.
a very basic part, but incredible helpful
No screws, just tape, pool liner and my 3d print. Sounds funny, but worked wonderfully

The next issue was the fact that my darkroom was not made for 40x50cm plates. only for 30x40cm ones. After some tests with smaller plates, we only had one cup of developer left. Beside that, everything starts to get unpleasantly expensive if you pour on plates with this size. So my goal was to make it work with only one attempt. I did some dry runs to get comfortable with everything. Not only the dark room work was something I had to prepare for, but also the camera. These old beauties all have some quirks. Besides that, Alois made a beautiful plate holder by himself. These holder needed also some special attention. But as explained in the video, I love these challenges. It makes the result at the end even more sweet.

To calculate the strobe power I needed, I used my wet plate strobe calculator that I created for my Patreon supporters. Since I made it, I use it all the time for myself, because it makes life much easier with the wet plate process. If you are a fan of analog photography and the wet plate process, have a look at our wet plate conversation magazine on Flipboard. Besides many great stories about our favourite process, you’ll wind there also work from other wet plate artists.

I really like how this portrait turned out. As expected it is very abstract because of the F-Stop and the wide angle lens.Here you can see again how huge that tintype is.

But this is not the end, because of some kind of funny coincidence, a former workshop participant sent me a very similar lens over. I am thinking to do a still life plate with that one. What do you guys think?

Two very similar lenses. Funny how sometimes things turn out.

But there is more, I got also a very tiny lens. I guess I need to build a camera for this one

A full functional lens in the size of a thumb. I haven’t seen such a thing before. What a cutie.

I hope you enjoyed that journey. It took me a long time to finish everything, but I am again glad that I worked through it.

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  • Posted by Markus on March 8th, 2023 | Filed in 3d print, alumitype, analog, collodion, darkroom, diy, eye, Gear, Hensel, nassplatte, photography, studio, video | Comment now »



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