[gmans]

This is absolutely correct. You may also, because of the material's darkness, get reflections of your lens face as well as the surroundings as ghosts on the image. That happened to me when shooting through a two-way mirror (even though I was in a a dark room.)

You are right about the reflections as well it acts as a mirror. Shooting thru glass you can put the lens against the glass flush, works for aquariums etc, minimum loss of contrast and no reflections.

[pixie]

K David, Ggmans, NicoleC, thank you for chipping in, I will go with 67mm and step up rings.

[Digitalis]

Pretty inventive trick with the rubber bands holding the filter there - however, there is a potential issues with the filter contacting the front element of some of the more bulbous lenses out there, this will cause newton rings which are best avoided*.


*they are impossible to remove.