Question about tilt-shift adapting a normal lens.

Started 2 months ago | Questions thread
Truman Prevatt
Truman Prevatt Forum Pro • Posts: 11,631
Re: Question about tilt-shift adapting a normal lens.

A lens for a view camera or similarly any camera that uses a bellows to focus is a very simple lens compared to the internal focusing lenses required for a fixed lens camera like the ones most of us have.  However, a good view camera lens will be a very expensive lens. Why?  A lens has to project objects in the acceptance angle onto the film sensor.  The light projected onto the sensor is called the image circle. For a fix lens axis lens like the image circle only has to cover the sensor - nothing larger.  For a view camera the image circle has to cover the sensor but in this case the sensor is not fixed.  The reason a view camera lens is expensive is the image circle has to be large enough to cover all the camera movements, tilts, swings and shifts.

So if one wants to attached a tilt-shift adaptor to an APSC sensor camera, the image circle of the lens needs to be sufficient to cover the sensor at the most extreme movement.  An APSC lens is not designed to do that.  To get the best results a lens designed for a larger format would be preferable, i.e., FF for an APSC sensor, medium format for a FF sensor, etc.

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