Sigma 12-24mm f/4 DG HSM Art Lens Sample Pictures

There are only a small handful of DSLR lenses that can take in a view this wide. Basically, excluding fisheye lenses, the Canon EF 11-24mm f/4L USM Lens or one of the three Sigma variants including the latest, the Sigma 12-24mm f/4 DG HSM Art Lens are your choices.
 
With the senate recessed for the holiday, I made a visit to this location to give the Sigma 12-24 Art a workout. The angle of views afforded by this lens are a blast to use and with the widest, I was able to capture a great deal of the French Renaissance architecture in the senate chamber.
 
While the 12mm angle of view was great to have, the bright lights were a bit of a problem from an exposure standpoint. But, they were very beautiful and I wanted to see some of the detail in them. Thus, an HDR technique was needed.
 
The primary image was captured at 2.5 seconds with a second image captured at .4 seconds (2 2/3 stops darker) to retain some of the detail in the lights. It can be very challenging to composite two images captured at such drastically different brightness while retaining a natural appearance, but here is a technique that proves rather easy.
 
First, stack the two images in Photoshop with the brighter image on top. Then add a layer mask to the top layer and select the layer mask. Select the brush tool, select black as the color and reduce the opacity to something low, such as 10%. Select a brush size appropriate for the area that needs detail added (areas too bright in the original exposure) and adjust the brush hardness as desired (softer may be better in this situation). Then paint the blown areas until just the right amount of detail shows through. The process is easy and the results appear natural.
 
When photographing a symmetrical scene such as this one, it is usually desirable to have the scene perfectly centered in the frame (for perfect balance) and to have the camera perfectly centered in the room (to avoid perspective-caused converging horizontal lines) and horizontally level (to keep horizontal lines parallel to the frame borders). As you can figure out from the resulting image dimensions, I cropped this image very slightly from the top left to perfect my capture. Note that no distortion correction was used. Even at 12mm, this lens is a good performer in this regard.

It is early spring and, at least here in the mid-Atlantic and farther north latitudes, the outdoor landscape is looking rather bleak right now. The snow is gone and the green has not yet come. That makes this is a great time of the year to focus on indoor photography and interior architecture is one great option. And when photographing interior architecture, an ultra-wide angle lens becomes especially useful.
 
Most of us photographers love curves and the Italian architecture in the Pennsylvania House Chamber is filled with them. While cameras are not permitted in this space when the house is in session, selecting a non-session day cleared that roadblock. Moving to one side of the balcony gave me an angled view across the room that sent ceiling lines arching into the frame.
 
Got 12mm in your kit? That is the full frame focal length you will need to capture this image and many others like it. The Sigma 12-24mm f/4 DG HSM Art Lens on a full frame body executes this image (and those similar to it) extremely well. Even though the aperture used was not extremely narrow (f/8), the entire image is within the 12mm depth of field and the Canon EOS 5Ds R's extreme resolution was fully utilized with essentially no visible impact caused by diffraction. This image is tack sharp from corner to corner.
 
Notice that the columns on the sides of the image are vertically straight (or very close to being so)? While it is easy to have these lines angling inward or outward when using a focal length this wide (and that is sometimes a desired effect), a vertically level camera will render vertical lines parallel to each other and these lines can be parallel to the frame borders as long as the camera is horizontally leveled.
 
Spend your money on gear, not admission fees. One of the great things about the PA state capitol building is that admission is free. While you may not live close to this specific capitol building and will not likely find it alone to be worth a plane ticket or all-day drive to get there, your own state capitol building may offer the same deal. I didn't check all 50 USA state capitol buildings (or any outside of the USA), but many others also have free admission.
 
Get your ultra-wide angle lens and go photograph some interior architecture!