I'm trying to figure out how all this stuff relates to one another. Crop factor seems easy enough. If I have a 100mm focal length lens and I put it on my d350, it effectively becomes at 160mm due to ...

Watch the video: What is focal length? Take two 50mm lenses: an f/1.8 and an f/1.2. Even though they both have the same 50mm focal length, they're not the same physical length – and neither of them is ...

Replay: Do we really need to keep using 35mm as our baseline for focal lengths, or is there a much better way? Why do we keep reading descriptions like ‘3.7 mm to 92.5 mm (equivalent to 28.8 mm to 720 ...

When looking for the best focal lengths for portrait photography, most users are introduced to lenses of 35mm, 50mm, and 85mm focal lengths. It is difficult to declare a true winner between the three, ...

We look at the wonderful world of wide-angle lenses; how they’re used and pitfalls to avoid. These two images show the differences between an ultra-wide (14mm equivalent) and a normal wide-angle (28mm ...

Surprise! I’ve been reviewing lenses, cameras and photographic gear for 25 years and counting. Am I bored yet? Not in the least and Sigma is one of the companies that I have to thank for that. I’ve ...

Wide-angle lenses for Sony shooters—and everyone else—represent an essential piece of kit in a well-rounded gear bag. Wide-angle lenses provide a broad, sweeping angle of view. They allow you to show ...

Buying and shooting tips for different types of wide angle lenses. Wide angle lenses range from a very modest increase in the angle of view through to so-called ‘fisheye’ lenses that encompass angles ...