### angle of view across different formats

greenspun.com : LUSENET : Large format photography : One Thread

Hello

I am interested in doing some panoramic photography, but am a bit stuck re the correct manner in which to calc the correct angle of view, and hence the mm lens. When calculating you usually work out the diagonal of the film. Is there a site which has a list of these stats including 6x12 and 6x17.

Thannks Karl Beath

-- Karl Beath (karlfoto@mweb.co.za), November 29, 2001

I wrote a really dumb Javascript angle of coverage calculator that you can find here: www.redhillphoto.com/aoc.htm l. Feel free to steal the source so you can modify it for 6x12 and 6x17.

-- Chad Jarvis (cjarvis@nas.edu), November 29, 2001.

Arctan (1/2 the film diagonal divided by the focal length of the lens).

-- Pete Andrews (p.l.andrews@bham.ac.uk), November 30, 2001.

...times two. (almost forgot)

-- Pete Andrews (p.l.andrews@bham.ac.uk), November 30, 2001.

Karl,

Make up a sheet in Excel and place this formula in Column C2:

=ATAN(B2/2/A2)*180/PI()*2 where A2 = focal length and B2 = horizontal length of format. Of course row 1 would be you column titles.

Cheers ... WG

-- Walter Glover (walterg@netaus.net.au), November 30, 2001.

or go here and download it - gives two different options for comparisons diagonal and proportional (or soemthing like that - don't have it on here)

http://people.smu.edu/rmonagha/mf/lenses3.html

-- tim atherton (tim@kairosphoto.com), November 30, 2001.