ALPA 42mm (507) 85A Color Conversion Glass Filter
- This is a used item
- No Longer Available
The Alpa 42mm 85a Glass filter will produce natural colors when shooting with tungsten film outdoors.
What do you do when you must take some photos outdoors and all you have left is tungsten film? Using tungsten film in daylight will produce a bluish cast in the photograph. The 85 series of filters will "bring back", i.e. color balance the tones in your images. These yellow filters are used to correct differences in color temperature between the recording medium (film/video) and the light source.
It should be noted that an 85 filter produces slightly cooler results than an 85B (with tungsten film in daylight) whereas an 85B converts tungsten film to daylight. The 85C produces the coolest results - more than either the 85 or 85B. However, it is interesting to remember that an 85C is also useful as a creative warming filter with daylight film in daylight.
Note! Whereas the 85 series is used for tungsten film under daylight conditions, use the 80 series of filters when using daylight film under tungsten lighting
85 Series Color Conversion Chart
- An 85 decreases the color temperature from 5500-3400° Kelvin
- An 85A decreases the color temperature from 5500-3100° Kelvin
- An 85B decreases the color temperature from 5500-3200° Kelvin
- An 85C decreases the color temperature from 5500-3800° Kelvin
| Type | Color Conversion |
| Size | 49 mm |
| Grade | 85 |
| Filter Factor | 1.8 (+2/3 stop) |
| Multi-Coated | No |
| Rotating | No |
| Effect | Removes excessive blue from images and produces more natural colors |
| Application | When pleasing color balance is desired when shooting with tungsten film outdoors |
| Color Temperature | Decreases the color temperature from 5500-3400° Kelvin |
| Construction | Glass |
| Front Filter Thread Size | 49 mm |
| Front Lens Cap Size | 49 mm |
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