So I took some photographs using the Olympus keystone compensation on a trip to Montreal. Most of them deal with buildings that are leaning back, which is the classic case when trying to photograph a building. The first set deal with some landscape photographs. In both these photographs I could not move any further back to take the photographs, and both were taken with the Olympus 12-40mm, set as wide angle (12mm or 24mm full frae equivalent).It was possible to correct both images, without loosing any of the building.
The second case deals with portrait format photographs. In both cases it was slightly more challenging to make sure the entire picture was in the frame, but doing it in-situ it was possible to assure this happened. Doing in post-processing may result in the lose of a portion of the photograph. In the lower image I had enough leeway to position the keystone-corrected frame in such a manner that the building is surrounded by ample space.
Compensating for perspective distortion often comes at a price. Modifying the geometry of a photograph means that less will fit in the photograph. Taking a photograph too close to a building may mean something is cut off.
Horizontal keystone correction can sometimes be more difficult, because the distortion is usually a compound distortion. In the example below, the photograph was taken slightly off-centre, producing an image which is distorted both from a horizontal and a vertical perspective.
Is there a loss in aesthetic appeal? Maybe. Food for future thought.