what does focal length means?

[cheekiang]

hi,

what does focal length means?

how is affect the depth of field?

chee kiang
canon ixus 850
canon eros 400d

 

[raptor84]

http://en.wikipedia.org/wiki/Photographic_lens and http://www.cambridgeincolour.com/tutorials/camera-lenses.htm

Use google and read up

 

[Artosoft]

hi,

what does focal length means?

how is affect the depth of field?

chee kiang
canon ixus 850
canon eros 400d

Focal length is a focus distance of the lens when the lens' distance set to infinity.

In general, the longer focal length, the shallow Depth of Field.

Regards,
Arto.