More from the new DSLR FILM NOOB Channel.

The labeling of a crop sensor lens can be confusing. The Sigma 30mm f1.4 for example is labeled as a 30mm lens, but since it’s really only designed to work on a crop sensor camera, it has an equivelent focal length of 48mm (1.6 times 30). So why is it labeled as a 30mm lens?

Even though lenses can be designed specifically for a crop sensor camera, the label on the lens still represents what the lens’s focal length would be if it were used on a full frame camera.  An EF-S lens can even be used on a full frame camera, although you will end up with strong vignetting as shown in the video.

If you’d like find out more about how the Sigma 30mm f1.4 stacks up against a full frame lens, you might want to check out this earlier post. The 30mm f1.4 is a great crop sensor lens for the price and still sees a lot of use in my lens collection.

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