The Canon tilt/shift lens family.

Although it is always a problem for architectural photographers, product and even scenic photography will often be improved by its elimination. View camera practitioners simply raise the front of the camera to solve this problem. By raising the camera lens, while keeping the camera's film plane aligned with the subject's plane, any distortion is prevented. The same technique would apply in photographing a cereal box, or similar subject, in the studio. Here, because the camera position is usually slightly above the subject the photographer could use front fall, a lowering of the lens, to keep the camera back parallel to the subject plane. Perspective control lenses allow only movement on this one plane, a vertical rise or fall, although most can be rotated 90 to allow the movement to be applied to a horizontal plane as well. In view camera work this horizontal movement is called a shift or slide.

Architectural photographers have long realized the advantages of perspective control lenses. Here, the Canon TS-E 24mm f/3.5L renders the University Library at Cal Poly, San Luis Obispo, as effectively and distortion-free as a view camera would. Photos © 2001, Joseph A. Dickerson, All Rights Reserved

Depth Of Field
Enter the tilt/shift lens. Tilt/shift lenses do all that a perspective control lens can plus they add the ability to tilt the lens in relation to its axis like the lensboard on a view camera. This tilting of the lens allows the plane of focus to be angled to coincide with the subject plane. Here is a good place to correct an all too common misconception. I often hear photographers saying that they are using view camera movements, or tilt/shift lenses, to increase their depth of field. Depth of field is a product of f/stop, focusing distance, and/or image size; camera movements per se do not increase depth of field.

Camera movements simply allow the photographer to place the focus plane to optimize focus throughout the subject. This placing of the plane of focus makes the most of what depth of field there is. This all sounds very technical and, if you're new to this stuff, it is just a little confusing. Not to worry. With perspective control lenses, tilt/shift lenses, or even view cameras for that matter, all this stuff is visual. You can see it happening in the viewfinder or on the ground glass. No dark magic is involved; you shift or tilt the lens one direction and you see the change in the camera's viewfinder. Not that it will be entirely intuitive. You will have to practice a bit, but the principles are definitely not rocket science. I figured it out, so I know you can.

TS In The Field
Just where does all this fit into my photography you're asking? Well, let's take of couple of photos together and see whether you can find ways that tilt/shift lenses might get you out of a spot. I love wildflowers, and judging by the thousands of wildflower images, books, web sites, and hot lines that are out there, so do a lot of you. So here we are at my favorite wildflower spot at the peak of the blooming season. California poppies, tidy tips, baby blue eyes, owl's clover everywhere you look. And, typical of this very special spot, it's just a little bit windy.

This dilapidated subject required great depth of field and, due to windy conditions, a fast shutter speed. The Canon TS-E 90mm f/2.8 lens allowed the plane of focus to be aligned with the plane of the subject and captured the subject as no standard lens could have.

Well, I've got my shot all lined up, camera right on the deck inches from the nearest blooms, wide angle lens on the camera to push the background farther away--but I'm going to have to stop down to f/32 to hold sharp focus throughout the scene. Remember what I said about wind? I'm really in the deep stuff now because at f/32 I've got to shoot around a 1/30 or 1/15 of a sec. In the wind, with all these flowers quivering on their tiny little stocks? Never happen.

But, you and I are clever devils and we thought to bring a tilt/shift lens. So, I put the tilt/shift lens on the camera, focus on the distant flowers and then slowly apply the lens tilt so the plane of focus, which is perpendicular to the lens axis, tilts to match the plane of the subject. When the near blooms come into focus (again, this can be observed in the viewfinder) I have optimized the focus for this subject. This is accomplished with the lens wide-open. Stopping down one or two f/stops will improve sharpness and give a little more depth of field, and there you have it. Everything in focus from near to far and I only had to stop down a couple of stops so my shutter speed is a more reasonable 1/500 or 1/1000 of a sec, which should stop the wind motion.

It actually takes less time to perform that little dance than it took to read about it, and it can all be encapsulated in four words, focus far/tilt near. That is, you focus on the distant point you want to be sharp and then use the tilting feature of the lens to bring the near point in focus. Honestly, it's that simple. This is one reason photographers like Ansel Adams, David Muench, and so many others work with view cameras. They can achieve images with universal focus; everything is rendered sharply, inviting the viewer to visually wander throughout the scene.

This sunset shot of the Los Angeles skyline works partly because the buildings are rendered without any apparent distortion. The Canon TS-E 45mm f/2.8 lens was used with maximum shift applied in the vertical plane.

Scenics, Too
We have already talked about architectural applications of tilt/shift lenses, but the same principles apply to many scenic shots as well. For instance, shooting in the coastal redwoods of Northern California, simply pointing the camera up to include more of the forest canopy will make the trees look as if they are closer together at the top. By shifting the front of the tilt/shift lens up, remember, it's called front rise, we can capture the true perspective of the scene. Cool stuff, huh?

So, who makes tilt/shift lenses? Well, currently only Canon (www.usa.canon.com) and Nikon (www.nikonusa.com). Canon has three tilt/shift lenses in their catalog: TS-E 24mm f/3.5L, TS-E 45mm f/2.8, and TS-E 90mm f/2.8. The previously mentioned Nikkor lens is the PC Micro-Nikkor 85mm f/2.8D. If you don't shoot Canon or Nikon don't despair. All is not lost. There exists a device that is adaptable to almost any camera you care to name. It is available as a tilt adapter, a shift adapter, or a combination of both tilt and shift. It is made and marketed by Zrkendrfer Film-Und Fototechnik of Mnchen, Germany. They also are purveyors of some other really nifty equipment, and a number of the folks at Shutterbug use the stuff. Check out the web site at: www.zoerk.com.

Imagine what a tool as versatile as a tilt/shift lens or adapter could do for your creativity. Many noted nature photographers, George Lepp and John Shaw to name two, have already made that discovery and believe me; they aren't out there just tilting at windmills.

Steps For Using The Tilt/Shift Lenses To Optimize Depth Of Field

• Focus on the distant point that you want to be in sharp focus.
• Visualize the plane of the subject and tilt the lens in that direction.
• Check the focus on the near point that you want to be in sharp focus.
• Refocus on the far focal point while gradually tilting the lens forward and checking the near focus. At some point both the far and near points will be sharp. That's it.
• Remember: focus far/tilt near. It takes a little time but you'll get quicker, and more accurate, with practice.