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Category: Photoworld

Geometric and Diffraction MTF Charts: A Clearer Picture for Photographers

Our technical product information has been expanded to now include both Geometric and Diffraction MTF charts for new Sigma lenses. You can take a look at the technical information about the new Sigma 18-200mm F3.5-6.3 DC OS HSM | Contemporary lens on the Sigma Global Vision website to see these graphs plotted as part of the total package of information we share to help photographers understand the performance of our lenses.



The Holiday 2013 Sigma Lens Size Comparison Graphic

Click the photo to view it full-screen. And Let us know which of these lenses are on your #SigmaWishlist on our social channels for a chance to win a cool swagbag between now and Dec 26th! We'll be giving away 10 across all social channels that use the hashtag #SigmaWishlist. (US Only.)

In case you were ever wondering how many of our smallest lens equal one of our biggest lenses, and how our lenses size up to a cardinal or a 16 oz cup of coffee, we present the Holiday Season 2013 Sigma Lens Comparison Chart! Here’s our entire lens lineup, to scale.



Prime Time: Focus on Fixed Focal Length Lenses

A ring of beach rocks seen through the Sigma 15mm EX DG HSM Diagonal Fisheye with the horizon line near the center of the frame.

Prime lenses are designed for exceptional imaging at a single focal length. Unlike zoom lenses that easily span a given focal range and variable field of view with a twist of the zoom ring, the field of view and focal length remains constant. If you want to take in less of the surroundings with a given prime lens, you’ve got to physically move closer, and to take in more of the scene, you’ve got to back up. But of course, as you move, the angle of view remains the same all the while.