Pinhole Exposure Calculator

Pinhole Exposure Calculator, inspired by Richard Koolish paper calculator, is a model designed to assist users in determining the optimal exposure time for pinhole cameras. The calculator comprises three disks, each contributing essential parameters to the exposure calculation:

1. Shutter Speeds and Lighting Conditions Disk: 
   The first disk contains shutter speeds values ranging from 1/4000 sec to 8 hours and values for lighting conditions. Lighting conditions are defined within the range of values 10 to 20, which signify:
   
   
    
2. Film Speed (ISO) Disk: 
   The second disk contains ISO values ranging from 0.375 to 3200.
    
3. Aperture (f-number) Disk: 
   The third disk contains aperture size values (f/number) in the range of 1 to 2048.

How to Use:

1. Determine the aperture size (f/number) of the pinhole used in your camera. 
   (If you are yet to manufacture your pinhole camera, I recommend using PinholeDesigner or Pinhole Size Calculator to select an appropriate aperture size.)
2. Use the arrow on the second disk to set the lighting conditions prevailing at the location where you will be exposing the photograph.
3. Rotate the third disk to select the ISO value of the photographic material (135/120 film, photo paper, etc.).
4. On the third disk, find the aperture size that corresponds to the aperture size used in your pinhole camera.
5. Now, read off the shutter speed from the first disk at the point where it intersects with the number corresponding to your aperture number.