Dear reader, if this entry or my other blog entries don't answer your specific photography questions, you can call me on the phone anytime for advice by clicking here.When you are asked to do interior photos of a large room or building, one of the most important technical elements of the final picture are straight lines. A sure sign that an interior photo was taken by an amateur photographer are curved or angled walls. The unnatural curve that you experience when taking the photo is not your fault; your camera lenses are not nearly as advanced as your eyes, which have the ability to optically correct the curving perspective.
So how do you correct the image so that all lines in the photograph will be straight? Here are a few suggestions for in-camera perspective control, without using software:
1. Learn how to use a view camera. This is a very expensive, time consuming, and technically challenging endeavor. To learn more about view cameras, do an internet search.
2. Purchase or rent a perspective control lens made by Canon or Nikon. These expensive lenses can move in many directions, and will allow you to get straight lines by experimenting with the amount of Tilt and Shift that you apply (these lenses are also called Tilt/Shift lenses). Currently, Canon has the best version of this lens, as their 24mm wide angle will be adequate for most interior spaces.
If you don't have the cash for the above options, the second-best choice is using software such as Photoshop. Software still requires the very best image however, so you need to supply it with a photo that is as straight as you can possibly get. To do the most for the photo, follow these guidelines:
1. Always use a tripod.
2. Compose the photo so that you are exactly in the middle of the room.
3. If possible make sure your camera is positioned at the same distance between the ground and the ceiling (half-way up the room). You may need a ladder to do this, and a measuring tape.
4. Step away from the camera and make sure that the lens is pointing exactly 90 degrees away from the floor. In other words, the lens direction has to be completely parallel to the floor.
5. Set the lens aperture of f8 or f11.
6. Use a cable shutter release or 10 second timer so you aren't touching the camera while the shutter is released.
7. Take the photo!
If you are able to import your final image into Photoshop or other software, you can now make fine-tune adjustments to create straight lines throughout the photo. Each software is different, so you will have to read the instructions or ask someone to help you with this. Some key words to look out for are "barrel distortion", "pincushion distortion", "perspective", and "lens distortion correction".
Mark's photographic prints for your wall can be purchased at
www.markhemmings.com