Originally Posted by
rpcrowe
I am just going to convert the antiquated measurement system we use to only roughly metric. This isn't brain surgery/
I simply took two squares of plywood about 18-inches (about 46 or so centimeters) square and one piece of plywood about 12-inches (about 20.5 cm) x 18-inches. The thickness of the plywood should be approximately the same as the thickness of your window glass.
Using a heavy duty cement, glue the three pieces together with the smaller piece in the center so that you have a square with a slot at the lower approximately one third and triple thickness at the top two thirds.
Cut a V in the triple thickness section of a size that will accommodate the diameter of your lens.
Roll down your window until it is a bit higher than the groove between the double section of plywood. Slip that section over the window glass and rest your lens in the V you have cut.
You can use some insulation material or anything else soft to pad the V in order to avoid scratching the lens.