Kaufmann Posographe Exposure Calculator

The Kaufmann Posographe was not something I was looking for. In fact, I had never heard of it before buying. The opportunity to purchase it came from a contact at a local antiques mall, and I couldn’t pass on it.

Designed and manufactured in the early 1920’s, the Posographe uses a collection of seven interconnected sliders and associated cams to calculate exposure time. Exposure is calculated using factors such as indoor/outdoor, time of year, type of landscape, weather conditions, aperture, the sensitivity of the film emulsion, etc.

img_4396img_4395

This image is from the original manual and shows the internal mechanism.

img_4388-1

 

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s