[1x Gel Filter] The NISI S6 Filter holders and Adapters are offered for a large number of lenses

[1x Gel Filter] I wanted a good general purpose lens for an upcoming trip with lots of landscape and cityscape opportunities.

[0.035 lb] I have been using the generation one Sigma 12-24mm lens for wide landscapes and architectual shots for many years. The older lens was sharp in the center but soft at the edges and corners even when stopped down. The older lens was at its worst in the 12-15mm range, right where you needed it most. I am very impressed with the sharpness of the new Art version, especially at 12mm wide open. It is impressively sharp right to the edge of the frame and even deep into the corners. Not tack sharp like the center, but very very sharp for the edges of a super wide lens. If you own one of the older Sigma lenses and are thinking about upgrading, don't wait. The new lens is a huge improvement over the older versions in every respect, including build quality, and image quality. If you consider cost as a downside to the new lens, consider the Canon 11-24mm lens. The Sigma is about half that price, so perhaps the Sigma is a bargan. In the DPREVIEW review of the Sigma Art lens they said at 12 mm it is very close to the Canon in terms of sharpness and beats the Canon in terms of vignetting, chromatic aberration (CA) and distortion. The DPREVIEW review of the Sigma lens was not as good in the 16-24mm end of the range. However, the images I have taken with the lens with my 5Ds look pretty darn good, at 24mm. At that focal length, the Sigma beats my Canon 24-105mm L lens in terms of sharpness. At 12 mm The Sigma is approaching my Canon 70-200mm f/2.8 IS II lens in terms of sharpness. If you are familiar with that lens, you will know that is impressive. For my purposes, the Sigma is a winner, especially when you consider price. That is why I gave it a 5 star rating.

[0.035 lb] I have been using the generation one Sigma 12-24mm lens for wide landscapes and architectual shots for many years. The older lens was sharp in the center but soft at the edges and corners even when stopped down. The older lens was at its worst in the 12-15mm range, right where you needed it most. I am very impressed with the sharpness of the new Art version, especially at 12mm wide open. It is impressively sharp right to the edge of the frame and even deep into the corners. Not tack sharp like the center, but very very sharp for the edges of a super wide lens. If you own one of the older Sigma lenses and are thinking about upgrading, don't wait. The new lens is a huge improvement over the older versions in every respect, including build quality, and image quality. If you consider cost as a downside to the new lens, consider the Canon 11-24mm lens. The Sigma is about half that price, so perhaps the Sigma is a bargan. In the DPREVIEW review of the Sigma Art lens they said at 12 mm it is very close to the Canon in terms of sharpness and beats the Canon in terms of vignetting, chromatic aberration (CA) and distortion. The DPREVIEW review of the Sigma lens was not as good in the 16-24mm end of the range. However, the images I have taken with the lens with my 5Ds look pretty darn good, at 24mm. At that focal length, the Sigma beats my Canon 24-105mm L lens in terms of sharpness. At 12 mm The Sigma is approaching my Canon 70-200mm f/2.8 IS II lens in terms of sharpness. If you are familiar with that lens, you will know that is impressive. For my purposes, the Sigma is a winner, especially when you consider price. That is why I gave it a 5 star rating.

[Plastic] It's heavier than any other lens I own. Bigger around too. The outer lens is massively curved, and image quality is amazing. So glad I jumped on the sale, amazing value.

[1x Gel Filter] My intention is to use this lens for scenic closeups with backgrounds for perspective. I may also use it for scenics where I want to capture a lot of sky. So far, the in-field resolution at closeup distances is much better than I expected. A lot of lenses lose a lot of resolution close-up but this lens does not. This is a heavy lens but I don't know of any other lens capable to capturing these type of images, especially at 12mm. Can't wait to use it in Yosemite.

[Plastic] Due to the fact that the Sigma 14-24mm f/2.8 DG HSM Art, does not have a tread, so the specific custom made Adapter gives the secure method of working with Polarizer and Nd Filters

I recommend everyone to use this combination

[0.035 lb] Quality lens at an affordable price.

[Plastic] I should have bought into the 12-14mm years ago but stuck to 16mm (16-35 L 2.8). This Sigma is a monster sized/weight lens that feels like a tank artillery shell, but this is good. I'm not buying into this new smaller, more petite trend. I'm sticking to my DSLR which actually works better for my line of work, all photo and no video.

[1x Gel Filter] The Sigma Adapter is the kernel point to set up a landscape scene within the use of Polariser and ND filters

You are soon a prof too to do the same as us

Wish you great succeses!!!