best budget lens for crop sensor?

Started Oct 11, 2011 | Discussions thread
MitchAlsup Veteran Member • Posts: 5,221
Re: best budget lens for crop sensor?

The lens provides two things: a) a focal length, and b) an aperture.

The focal length defines the scale of the image
The focal length AND the size of the sensor determine the apparent field of view
The aperture defines the depth of field
The aperture AND the size of the sensor defines the apparent depth of field
The aperture and the ISO determine shutter speed

It is not a price performance kind of thing. You buy a lens because it provides the aperture and the focal lenght you need to "get a shot".
--
Mitch

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