Original Hoya 81A Filter for Sonnar lens Rollei 35 - 30.5mm in original case

Original Hoya 81A Filter for Sonnar lens Rollei 35 - 30.5mm - excellent condition
 
The 81A color correction filter warms the ambient light entering the lens by 200° Kelvin by adding "orange" to the overall exposure. The filter helps fine-tune the color or look of your scene to match your film's white balance.The Hoya 81A filter is helpful when:You are using daylight-balanced film and the light source is cooler than the traditional 5500° K and you need a specific amount of color correction to match your film type.You want to add a slightly warmer look to your portraits.You are shooting in overcast or shady conditions. A Very Rare Filter