TECHNICAL: Full-frame lenses on APS-C cameras is USUALLY bad

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Millions of photographers use full-frame lenses on their APS-C cameras. For example, they'll get a full-frame 24-70 f/2.8 lens and put it on their Canon 70D, Sony a6000, or Nikon D5600. That's almost always a bad idea, however. First, APS-C cameras use less than half the image produced by full-frame lenses, so you're carrying around a lot of glass that isn't being used. Second, you're also PAYING FOR that glass that you're not using. Finally, you're capturing less than half the detail the lens is producing, so if you use the same lens with a full-frame body, you'll almost always see sharper results.

Of course, being photography, it's not always that simple. If you have to crop anyway, such as when shooting wildlife, APS-C cameras with a higher pixel density will show more detail than the full-frame camera. Even without cropping, you might see sharper results if the APS-C camera has more megapixels, a weaker AA filter, or a deeper depth-of-field.

In this video I test several camera and lens combinations to give you the information you need to make educated buying choices.