Optimizing DIY Anamorphic Camera with Enlarger Lens Without Mechanical Shutter

[Mustafa Umut Sarac]

I know stories about group f64.

My workshop teacher has single 80mm rodenstock enlarger lens. We will build 6X24 or larger 120 spooled mid format film anamorphic cylinder camera.

What is the biggest size format I can build for 120 film ?

We will have lens at the top of the cylinder and pinhole aperture after the lens.

And my purpose is not burn film in shock time with enlarger lens with apertures ring but without mechanical factory made shutter , and so we add pinhole to the lens but what size?

Not losing the quality of rodenstock!

We must remember expose times should be fastest hand or elastic band operatable because I dont want blurry images.

Can you please help me to optimize those ?

 

[koraks]

pinhole aperture

Not losing the quality of rodenstock

expose times should be fastest hand or elastic band operatable

6X24 or larger 120 spooled mid format film

These requirements are mutually exclusive. The project cannot be done.

 

[Mustafa Umut Sarac]

I think project is doable. I have calculated , 80mm lens makes 6X33 format camera , if we cut 6 cms for rollers and bending the film on rollers , it would be an 6X27 Format camera. Lets make it 6x24 and 4 photos could be taken.

Next monday I will learn how much aperture can be closed may be up to f:22

I have calculated the depth of the cylinder is 6 cms and lens light cone can be focused to 80mm. Basic hipotenus calculation revealed the need of radius and circle around it.

It would be much interesting if we can form a rotating film sweeping slit. I defend it and I will make it this way.

This will make the camera , a widelux time sweeping camera and as jeff bridges defends its a half movie half photograph camera.

Project will be drawen on cad for extremelly high quality prusa s latest and biggest 3 d printer and files will be announced.

Time sweeping can be done with external stepper motor and ardunio. My friends are experts on that. Speeds will be 1/15, 1/125, 1/250.

 

[loccdor]

So, you don't actually mean pinhole aperture then. I think you mean fixed aperture.

I've inserted a fixed f/22 aperture in a postcard-size rollfilm camera lens before. I did that because the lens had been worked on and was missing its aperture blades. It did work. I made it out of black plastic card.

 

[Mustafa Umut Sarac]

So, you don't actually mean pinhole aperture then. I think you mean fixed aperture.

I've inserted a fixed f/22 aperture in a postcard-size rollfilm camera lens before. I did that because the lens had been worked on and was missing its aperture blades. It did work. I made it out of black plastic card.

Hello loccdor and everyone. Time sweeping idea came to my mind few minutes ago.
I dont think I have no interest with pinhole aperture after all.

Now the big question , how slit and speed of motor might be optimized to make film exposure times 1/15-1/125-1/250 ?

 

[koraks]

how slit and speed of motor might be optimized to make film exposure times 1/15-1/125-1/250 ?

The projected slit needs to expose each part of the film for the duration specified. You set the angular velocity to match the combination of the projected slit width and the desired exposure time.

My friends are experts on that.

There you go; they'll solve this for you.

 

[loccdor]

If you go with a 24 cm frame and you want, for simple example, a 1/24 sec exposure from a 1 cm slit.

Time of exposure: 1/24 sec
Distance traveled in that time: 1 cm (width of slit)
Movement speed of shutter: 24 cm per second

 

[koraks]

Movement speed of shutter: 24 cm per second

Movement of the slit, not the shutter. What you want to determine is the angular velocity.

 

[bernard_L]

anamorphic cylinder camera.

We will have lens at the top of the cylinder and pinhole aperture after the lens.

a widelux time sweeping camera

I'm confused. You seem to be describing two different camera designs.

• sweeping camera: the lens is on the axis of the [|film] cylinder, right in front of the film
• anamorphic cylinder camera: the film is also along a cylinder, but the lens is (as you state) along the axis of the cylinder, above the film; completely different from first one

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From the Widelux manual (buktus.org)

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from: http://ericconstantineau.com/photo/review_anya_en.html
"anamorphic cylinder camera (...) have lens at the top of the cylinder" as per your statement

The camera is a big empty tube, the sheet of film is inside, on the side of the tube, and the pinhole is at the center of the top plate.

 

[loccdor]

Movement of the slit, not the shutter. What you want to determine is the angular velocity.

Slit, yes. Isn't the slit a kind of shutter?

 

[Mustafa Umut Sarac]

I'm confused. You seem to be describing two different camera designs.

• sweeping camera: the lens is on the axis of the [|film] cylinder, right in front of the film
• anamorphic cylinder camera: the film is also along a cylinder, but the lens is (as you state) along the axis of the cylinder, above the film; completely different from first one

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From the Widelux manual (buktus.org)
View attachment 410246
View attachment 410247

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from: http://ericconstantineau.com/photo/review_anya_en.html
"anamorphic cylinder camera (...) have lens at the top of the cylinder" as per your statement

The camera is a big empty tube, the sheet of film is inside, on the side of the tube, and the pinhole is at the center of the top plate.

I am sorry to confuse. You are right to ask. I am thinking a tube camera , there will be a central axis of the tube and there will be a rotating slit touches the film and sweeping it. There will be a external stepper motor and external ardunio at the bottom and central axis. This camera by the design , bend the image and time sweeping action will increase the effects.

but if you direct it to panorama scene , it takes no distortion image if you are careful.

We are lucky , we have rodenstock and colors are faraway superior to schneiders.

 

[Mustafa Umut Sarac]

When thinking , I found a problem . Time sweeping rotating slit and film distance would be 4-5-6mm or so. Because there is a skeleton inside which is 4-5-6 so so mm thick. That slit and film distance makes a focus problem or does it think to the top lens focused to the film makes slit distance not a problem ? Or should I design the internal frame where the slit kisses the film ?