Green Filter for Sonnar lens Rollei 35 - 30.5mm

Green Filter for Sonnar lens Rollei 35 - 30.5mm - excellent condition
 
A Very Rare Filter
 
When photographing foliage in black and white, a green filter is used almost exclusively.
It lightens green foliage, which is particularly important with dark green leaves which can record very dark without a filter. It therefore gives a more natural, lighter feel to the photograph.