77mm filter with a soft focus effect that reduces contrast. - Model Name: BLACK MIST No.05 - Size: 77mm - Made in Japan - Effect: Soft focus effect - Features: Reduces contrast Thank you for viewing. I purchased this new and used it about 15 times. I didn't use it constantly, and I took it out of the case only when shooting. When not in use, I stored it in the case. I think it's still usable. I think it's recommended for upcoming illumination photography, etc.