Photographing Church Stained Glass Windows

[another view]

I didn't quite understand the comment "You may be able to put the camera vertically (portrait), zoom out and have the window at the top of the frame" Does this mean that you'll get less of a convergence problem with a long lens than a shorter one? I've got a 16-35 and a 70-200 to work with. Is the longer lens at its shortest zoom the best bet?

Here's an example with a Sigma 10-20mm lens all the way out at 10mm. I couldn't back up any farther or I'd go off a cliff, so I put the lighthouse at the top of the frame which kept the camera as close to level (vertically level) as it could be. With a longer lens (16mm, 20mm, etc), the camera would have been aimed up higher (less vertically level) so you'd see more of the "falling over backwards" effect.

There's plenty of stuff that can be cropped off the bottom (and the sides to keep the same ratio). Because of this, I didn't care about the shadow at the bottom of the frame or the part of the building just visible on the right. I know it's not a great shot - just trying to illustrate a point and it took a long time to get to this spot...

Nothing done to correct any distortion to it in Photoshop, but you can see it's already fairly close. I'm not a Photoshop expert, but have always preferred to start with a file as close to the end result I want as possible.