Quoted from StevenP:MutterFudder said:Thanks PZY, nice work man. I'll say to those who said we should have shot them all from the same spot that yes, we tried to get everything back to the same spots on all the machines, but we had to move the tripod out of the way to get glass on and off, and this was shot in all kinds of different sequence. So, we did the best we could. I think it came out pretty damn well.
Thanks for the comments and efforts. Like most people, I'd have to see the glass in person to evaluate. The videos make the Phoog and standard glass appear pretty similar. Part of this is indeed the noticeably different angles and fields of view in the videos.
Getting a consistent framing is not rocket science. Just mount the camcorder to a tripod. Place the tripod in front of the pin. Mark the tripod feet locations with tape or pennies or something. Move and replace the tripod in the exact same position after changing glass sheets. Don't change any of the ambient lighting or camcorder settings. That's all it takes. Trying to do it "by eye" is not scientific nor accurate. And for catching differences in glare/reflections, variable camera placement makes all the fancy video editing somewhat of a waste of time, as the critical info is lacking.
You could also place the tripod further back and use zoom, so the tripod wouldn't have to be moved.