Kaufmann’s Posographe is an intricate pocket-sized mechanical calculator invented back in the 1920s. Measuring 13x8cm and filled with tiny scribblings, the device allowed photographers to approximate the exposure values they needed by simply sliding around six small pointers.
Photorank.me is a new web app that attempts to calculate how influential you are in the world of online photo sharing. After giving it read-only access to your social media accounts (e.g. Twitter, Facebook, Flickr, etc…) the app computes a numerical score based on reach, activity, and quantity. PetaPixel got a score of 63, and the highest ranked person on the global leaderboard is currently English Purcell Struth, AKA “photoeng” on Instagram.
Photorank.me (via Mashable)
A camera’s sensor size is a very good predictor of how good its image quality is, but understanding and comparing the sensors sizes isn’t very easy. While televisions and computer monitors are usually measured by diagonal length, sensors sizes are listed with its two dimensions in millimeters. Back in 2008, David Pogue of the New York Times wrote an article about this issue, calling for someone to develop an online tool for converting confusing sensor measurements into the diagonal length of the sensor in inches. Within three hours two new websites were born: Sensor-Size and Sensor Size Calculator.
Sensor-Size | Sensor Size Calculator (via Lifehacker)
Want to challenge yourself by shooting manually without a light meter? Head on over to eBay and pick up a Johnson “Standard Exposure” Calculator for less than $10. Released in the late 1940s, it’s a simple rotary device that lets you calculate the proper exposure by choosing the current scene, weather, exposure time, and film speed. Find more about these exposure calculators over on photomemorabilia. You can also check out the Exposure-Mat for a printable card that helps calculate exposure too.
DOF Calculator is an app for Android phones that helps you easily calculate depth of field and hyperfocal distances. Simply tell it your camera, lens, and aperture setting, and it’ll spit out the numbers you need for optimally sharp landscape photographs. You can download it for free by searching for “DOF Calculator” in the Android Market.
For a quick video tutorial on how hyperfocal distance works, check out this post.
DOF Calculator (via Lifehacker)
The golden hour in photography is the first or last hour of sunlight in a day that photographers often aim to shoot in, since the sun’s position produces a soft and warm light with longer shadows. The Golden Hour Calculator is a useful website that can help you calculate the golden hour(s) for your location, telling you exactly when the sun rises and sets.
The Golden Hour Calculator (via Reddit)
Update: Darkness is an app for the iPhone that can help you calculate your golden hours on the go. (thx @noahaboussafy)