UV filters test - supplement
2. Cokin UV 72 mm
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I suppose plenty of Readers identify the French company Cokin with big rectangular filters, inserted into a holder on a lens. Undoubtedly the system is recognizable and liked by many photographers because of its specific functionalism, so distant from the standard screw-on filters. As you see, a screw-on filter can also be found on this producer’s offer. Let’s compare it to its competitors.
Test result
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Mean transmission of ultraviolet light 23% - Score: 2/10
Mean transmission of visible spectrum light 89.2% - Score: 0/10 Score:
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With filter
Corner - Score: 0/5
Frame centre - Score: 1/5 Frame edge - Score: 1/5 Score:
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 Edge darkening 0.6% Score: |
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Significant streakiness
Score:
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Summary:
The filter score is 10/45 (22.2%).Taking into account the previous ranking and omitting the homogeneity score, which wasn’t tested before, the Cokin would be the last but one in the ranking, after the cheapest King.
Reflection losses of 10% are due to lack of any anti-reflexive coatings. It is also the cause of all the visible series of flares. The ultraviolet is also cut off too late. In fact, these achievements are more appropriate for a window pane and you really have to ask yourself whether you want to lose 10% of light, get a series of flares and virtually nothing in return. I don’t think it is a good exchange.
The filter was lent courtesy of Antymex company.
