Large format photographers using cameras with bellows have always had the luxury of being able to adjust the lens and/or sensor plane so they are not parallel. This technique is performed to alter the plane of focus. While a conventionally parallel set-up provides front to back sharpness from a focus point parallel to the sensor, the adjusted lens, swung or tilted, places the focus plane at a different angle. This is a very useful technique for landscape photography, allowing sharp focus from close range to infinity, even at wide open apertures. But it’s also incredibly useful for macro photography. With this in mind Photography Attic has taken a set of BPM camera bellows and modified them to create a versatile set of custom bellows with tilt, swing and also shift options.
The bellows lens and camera platforms are individually mounted on a pair of small ball & socket heads which can be attached to a straight bracket like the one you would use with a flash gun. You can then slide the ball and socket along the flash bracket to extend the bellows increase magnification. And then tilt the front or rear panel to create the new plane of focus.
Here’s an example of the tilted bellows in action. A small 25mm pocket watch has been photographed at an angle. Rather than head on and parallel to the camera lens. The lens was then tilted on the camera bellows set up and as a result the widest aperture of f/2.8 can be used with full front to back sharpness. As a comparison a second shot was taken with the lens set conventionally parallel to the film plane. Notice how the sharpness falls off to the rear.
Another option is to use the swing feature. Here the lens is angled in a clockwise or anti clockwise direction to provide sharer front to back focus on an upright subject.
You can also adjust to provide a combination of both tilt and swing when the subject is not horizontal or vertical.
This process is technically known as the Scheimpflug Principle. If you would like to lean more check out the wikipedia page here: Scheimpflug Principle
You can buy a set of modified bellows with tilt shift here:Custom Tilt Shift Bellows You will also need to buy a bracket to mount them on.