Blue Conversion filters help correct light deemed too warm or amber for the situation. The 82A filter is a pale blue filter that corrects 3000K light to 3200K. This is helpful when you need just a little tweak to the color temperature and not a full conversion from tungsten to daylight. It is a critical tool for film photographers because film has a fixed light balance that should be corrected in-camera for the most accurate results.Specs:- Density: 1/2-stop- Filter Dimensions: M (P) - 84mm x 84mm x 1.6mm, L (Z) - 100mm x 100mm x 1.6mm, XL (X) - 130mm x 130mm x 3mm- Filter : 82A/023- Effect: Reduces unnatural red tones in early morning or late afternoon light- Application: Used to make minor corrections in colour temperature- Colour Temperature: Increases temperature from 3,000 to 3,200 Kelvin (1/3 stop)- Construction: CR39 Resin