What do the numbers on the side of your lenses actually mean? Why are some lenses much more expensive than others? I explain all in this photography tutorial. You'll learn about lens maximum aperture, the light gathering capability and cost variation of different DSLR camera lenses.

Why are professional lenses more expensive? I explain the various features to look for when selecting a lens and demonstrate loss of light during zoom on lower grade telephoto and standard lenses.

What are the benefits of using converters with your lenses and how do these lens zoom converters affect the light getting through to your camera sensor?

Finally we take a look at an $8000 dollar lens - a very large piece of kit for you serious photography enthusiasts!

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Don't miss the next LIVE online photography workshop:
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