Originally posted by WPRESTO During the film era I made a black cardboard shield with a cloth around the center hole to block out reflections when shooting with an ultrawide* through glass of Plexiglass windows, but it was more clumsy and not as effective as an over-sized rubber lens hood that can be pressed directly against the reflective surface and allow a little camera tilt in any direction.
* SIgma 15~30mm, I also used this cardboard shield when using a big Cokin polarizer hand-held in front of the lens,otherwise the corners of the frame almost always showed reflections off of the filter (lens had a permanent hood and no filter threads)..
Clarification on my method of using the black cardboard, and the ideas presented by WPRESTO.
1) I generally used 50mm lens on FF 35mm (film), so the angle of view was not that of an ultra-wide.
2) In a plane the windows are (were) generally somewhat ahead or behind one and it may be difficult/impossible to manage pressing the lens rubber hood against the surface (and still see through the viewfinder), not to mention the potential for vibration to affect the shot--a real problem shooting typically at 1/15 second (at f/1.8, and iso 320 slide film).
3) In a museum and such they likely will not let you approach so closely as to use the rubber hood as described.
4) Conditions permitting (and with a wider FOV lens) the use of a rubber hood sounds like a great way--thanks.
BTW the following is a reference/discussion for the method I described--Russ Kine, "The Complete Book of Nature Photography," Revised Edition, 1979, Amphto, pages 146-148.