Go Back   Steve's Digicams Forums > Digicam Help > General Discussion

Thread Tools Search this Thread
Old Jan 24, 2006, 12:27 PM   #1
Senior Member
tmoreau's Avatar
Join Date: Dec 2005
Posts: 477

I was just thinking, if the aperture designation is a ratio related to the size of the front element, would f1.4 in a 35mm prime allow in as much light as f1.4 in an 85mm?

tmoreau is offline   Reply With Quote
Sponsored Links
Old Jan 24, 2006, 1:50 PM   #2
Senior Member
Join Date: Dec 2002
Posts: 5,803

The answer is yes to your question.

The amazing things about f-stop is that its lens & focal length independent.

If the scene is properly exposed on a huge 600mm at f/8 1/200, then you'll get exactly the same exposure with a 50mm at f/8 1/200. Needless to say, the actual aperture is very different between those two lenses.

Things like the Sunny-16 rule depend on this.

eric s is offline   Reply With Quote

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 Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 4:22 PM.