Human Rangefinder Card Generator

Human Rangefinder Card Generator (with hyperfocal distance chart) v0.6

By Thomas Achtemichuk

This was inspired by Martin Tai's article on photo.net
A thread related to this page can be found here on photo.net
If you run into any problems or have any requests, email me at tom@tomchuk.com

Input		Instructions
Card title:		Enter a title to identify this card - your name and the name of your lens maybe? Input will be limited to 21 characters.
Eye offset:	cm	Measure the distance between the center of your eyes with a cm scale ruler in the mirror.
Arm length:	cm	Extend your arm holding a business card vertically between your thumb and forefinger. Measure the distance in cm between your eye and the card.
Focal length:	mm	Enter the focal length of your lens in mm.
Maximum aperture:		The widest (smallest number) aperture of your lens.
Minimum aperture:		The narrowest (biggest number) aperture of your lens.
Film size:		Select your film size: Minox, 110, 135 (35mm), etc.
CoC:	mm	Optionally, you may enter a custom circle of confusion in mm if you don't want to use the d/1500 values for common film sizes from above.
Focus distances:		A comma separated list of distances you want for your rangefinder scale. These should coincide with the scale on your lens. There should only be numbers, commas (with optional spaces) and nothing else. Only enter values that are greater than arm length. Don't forget to set units!
Output resolution:	dpi	The image will be generated in the resolution specified here.
Output format:		The format you would like your image in: png or jpeg.

*** Note ***, this will generate an image which should be printed 3.5" wide by 2" tall. These are the dimensions of a standard business card. You will have to print it from an application that lets you set the size of the image you are printing. If you need them here are a Word doc and a OpenOffice sxw with the margins set to the proper size to leave a 2" x 3.5" area to insert the image.

To Use: Hold the card in your hand at arm's length. With your left eye, line up the '0' marking with a vertical element of the object you wish to measure the distance to. Now look through your right eye. The distance measurement that lines up while looking through your right eye is the one you want.

Changelog

Version 0.6

Circle of confusion based on d/1500
Added optional Circle of confusion field
Added APS-C film/sensor size (Jayant)
Added large format film sizes (Leonard Metcalf)
Added input for title
Added url on bottom of card

Version 0.5

Check for focus distances less than arm length

Version 0.4

Image is now returned at proper resolution instead of 72 ppi (Loh Koah Fong)

Version 0.3

Improved input validation
Fixed spelling mistakes (Claudio Vanin)

Version 0.2

Added calibration dots in the four corners (Miles)
Added two marks on the right side 1 in. apart (Miles)
Added infinity mark (Miles)
Added jpeg output

Version 0.1

Initial Release