I have recently acquired a Speed Graphic. It seems to be in pretty good shape except that the lens is a bit cloudy. I'm new to large format......and have no idea what type of lens would fit this camera. I do know that I could use a lens from a Polaroid 110A or 110B......but I prefer to buy from KEH and they don't have one. They have large format lenses......but again, I don't know which ones would fit this camera. Not sure if it matters.....but I'll be using a roll film back. (6X9) As far as focal length.....I'm mainly interested in landscape and old buildings. I will appreciate any advice. Thanks