Red Yellow Blue
Red Yellow Blue
For cameras there are different lenses which are colored. What are red, blue, yellow and grey lenses used for?
Ive heard red lenses are good for black and white? True or not Im not sure. Also what exactly is the polariser lense for? Thank you 
The items you describe are not lenses, but instead appear to be filters for black and white photography. They will change the intensity of various shades of grey in black and white photography. The polarizer filter is used to reduce reflections off things like water and glass.
From your description, these may be older filters, so it’s possible the polarizer wouldn’t work with newer cameras that require circular polarizer filters for glare reduction instead of older linear polarizers.
Red filters are good in black and white, particularly infrared photography.
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