The B&W 39mm Kaeseman Linear Polarizer Glass Filter is constructed from select polarizer foils and especially prepared optical glass. Kaeseman ("encased") filters are completely edge-sealed for maximum durability under extreme climatic conditions.
Polarizing filters are used to select which light rays enter your camera lens. They can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast.
The effect can be seen through the viewfinder and varied by rotating the filter. The filter factor varies according to how the filter is rotated and its orientation to the sun.
Note! Linear polarizers are used with most video and manual focus photo cameras. They are not recommended for auto-focus SLR cameras.
| Type | Kaeseman Linear Polarizer |
| Size | 39mm |
| Grade | Not Applicable |
| Filter Factor | Between 2.3 and 2.8 (approx. +1.3 stops) |
| Multi-Coated | Not Applicable |
| Rotating | Yes |
| Effect | Removes reflections and increases color saturation without affecting the overall color balance |
| Application | Well-suited to applications that require the highest possible imaging quality, especially with high-speed telephoto lenses and apochromatic lenses; also an excellent choice when temperature extremes are experienced |
| Color Temperature | Not Applicable |
| Construction | Schott Glass |
| Front Filter Thread Size | 39mm |
| Front Lens Cap Size | 39mm |
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Comments about B+W 39mm Kaeseman Linear Polarizer Glass Filter:
The B+W Kaeseman Polarizers are the best available...I got this for my Leica lenses, preferring to save $400 by avoiding the Leica Universal Polarizer. I made a permanent mark on the edge of my filter when rotated to maximum polarization and now all I need to do is rotate the filter until the mark is pointed toward the sun.
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