I'd like to ask any RB67 owners who have the lens shade to measure the dimensions of the shade especially as used for the 50mm and 90mm lenses. I made an adapter to use my series IX filters but need to construct a shade also. Length from the lens and opening dimension should be fine.
The 50mm shade is not screwed , but I put mine firmly fixed around the barrel .
The length from the lens : about 26mm ; the width (it's a square) : about 210mm .
I haven't a 90mm lense shade ; I use the 127-250 for the 90mm lens and it's OK ; this one is screwed and circular .
The lenght from the lens : about 50mm ; the internal diameter (maxi) : about 105mm .
I have a few bellows shades in my closet if you are interested in buying one very cheap? It has the Corkin filter slots n another place to put specail effects screens up front.