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Filters - UV or not UV?<br />

Perhaps a more informative way <strong>of</strong> plotting the data is as a bar graph comparing transmission in the visible range<br />

(400nm to 650nm) to transmission in the UV range (350nm-400nm). This is shown below. Added to the group is<br />

data for a Tiffen Haze-1 filter, which you can see is VERY effective at blocking UV and a Hoya 1B, a slight<br />

warming filter. The four filters on the left clearly don't really absorb UV any more than they absorb visible light.<br />

They may be fine as lens protectors but don't make good UV blockers.<br />

http://www.photo.net/equipment/filters/ (4 <strong>of</strong> 12)7/3/2005 2:21:53 AM

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