Why circular polarizers still matter: A high quality circular polarizer is still one of the most important accessories for any photographer’s bag. And the new Sigma Weather-resistant Circular Polarizers offer incredible performance, weather-tough design, and a fantastically upgraded case with grip arcs that keep the filters from rattling around in the bag.
One Photographer’s Experience Using Sigma Lenses for video in Istanbul, Brussels, and Paris by Eduardo Angel.
2014 was a very busy year for Sigma. We announced a host of new lenses and cameras, offered the Sigma dp2 Quattro Test Shoot, and participated in trade shows, and dealer events across the country. Photographers all around the world have been talking about our new lenses in the Art, Sports, and Contemporary lines, as well as the completely redesigned dp series cameras.
Of the three main variables relating to creative and artistic control on DSLR and compact interchangeable cameras–aperture, shutter speed and ISO– aperture control, is for many beginners, the most difficult to grasp. Have no fear, we’re here to help. Learning how and when to select a wide or narrow aperture unleashes the creative and expressive potential of your camera’s lenses.
A zoom lens is a type of camera lens that is offers the photographer a useful range of different focal lengths in a single lens. This is in comparison to a prime lens, which only offers a single focal length. A zoom lens allows for quick and easy re-framing of a scene while staying in the same physical position. Sigma offers a line of over 20 zoom lenses for DSLR photographers, ranging from wide angle zoom lenses, supertelephoto zoom lenses, and high-zoom ratio all-in-one lenses for both full-frame (DG) and APS-C (DC) digital cameras.
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.