Go Back   Steve's Digicams Forums >

Reply
 
LinkBack Thread Tools Search this Thread
Old Feb 15, 2003, 2:44 AM   #1
Member
 
gmlasam's Avatar
 
Join Date: Jan 2003
Posts: 95
Default Exposure Equivalent Question!!

Yesterday in photography class we talked about exposure. Two factors determine film exposure, shutter speed and F-stop.

The "Reciprocity Law" states that Time (T) x Intensity (I) = Exposure (E).

Can someone explain to me in mathematically how these exposures are equivalent?

f/22, 4
f/16, 8
f/11, 15
f/8, 30
f/5.6, 60
f/4, 125
f/2.8, 250
f/2.0, 500
f/1.4, 1000
gmlasam is offline   Reply With Quote
Sponsored Links
Old Feb 15, 2003, 9:28 AM   #2
Senior Member
 
fenlander's Avatar
 
Join Date: Jun 2002
Posts: 251
Default

There's a pretty good explanation here:
http://www.silverlight.co.uk/tutoria.../exposure.html
fenlander is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 2:26 AM.