Monday, July 24, 2006

Focal Length

The focal length of a lens is the distance from a point within the lens to the film plane when the lens is focused on infinity. Most of us us this just to say the length at what our lens "sees" its slightly incorrect...but you know what it works, and if it ain't broke dont fix it! The Focal Length of your lens effects the things it sees as well, one of them being your depth of field. The longer your lens the more shallow DOF you will get. cool trick, eh? Here are two pictures i took really quickly (yes i know one is really badly focused...but i said i did it quickly! lol)
See how the DOF is a littl more shallow on the one i took at 220mm?

HOMEWORK: play with your lenses. if you have one and it's a zoom lens shoot the same thing from the same play at diffent focal lengths. if you have more than one lens, do the same with them all. If you have a point and shoot i think you can do this with your zoom.


Blogger Miss Carrie said...

I gotta question, masta...

Regarding my 50mm 1.8 lens. I absolutely love it, but one problem that I am constantly running into is how 'shallow' it is and when I take shots of my nephew, sometimes his chin will be in focus, but the rest of his face is blurry. Even though I THINK I am focusing on his eyes? What's up with that?

4:57 PM  
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