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B + W 77mm Infrared Filter # 093 (87C) Reviews
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B + W 77mm Infrared Filter # 093 (87C) Reviews
7 of 7 people found the following review helpful 
Infra Red, June 2, 2009 By Wade (Yakima, Wa) - See all my reviews This review is from: B + W 77mm Infrared Filter # 093 (87C) (Electronics) This is a finely made filter. Brass ring and Schott glass. You really can't beat the Germans for optics. Build quality is top notch.
Its hard to find something to explain how an IR filter works, but here is a brief explanation the Wratten scale and where this filter fits.
Visible light ranges from 400 nanometers (violet) to 700nm (red). The table shows absorption limits for a range of infrared filters. This filter falls towards the end of the table.
Filter Absorption
Wratten #25 600nm
Wratten #29 620nm
Wratten #70 680nm
Wratten #89B 720nm
Wratten #88A 750nm
Wratten #87 800nm
Wratten #87C 850nm
Wratten #87B 930nm
As you can see, this filter covers the high end of the IR scale. It takes extremely long exposures to get a usuable image. Most IR photos you see are done with a Wratten 89B filter. Its right at the middle of the scale and will effectively filter out all visible light. This 87C filter also... Read more
› See the customer review...
| 7 of 7 people found the following review helpful Infra Red, By Wade (Yakima, Wa) - See all my reviews This review is from: B + W 77mm Infrared Filter # 093 (87C) (Electronics) This is a finely made filter. Brass ring and Schott glass. You really can't beat the Germans for optics. Build quality is top notch.Its hard to find something to explain how an IR filter works, but here is a brief explanation the Wratten scale and where this filter fits. Visible light ranges from 400 nanometers (violet) to 700nm (red). The table shows absorption limits for a range of infrared filters. This filter falls towards the end of the table. Filter Absorption Wratten #25 600nm Wratten #29 620nm Wratten #70 680nm Wratten #89B 720nm Wratten #88A 750nm Wratten #87 800nm Wratten #87C 850nm Wratten #87B 930nm As you can see, this filter covers the high end of the IR scale. It takes extremely long exposures to get a usuable image. Most IR photos you see are done with a Wratten 89B filter. Its right at the middle of the scale and will effectively filter out all visible light. This 87C filter also... Read more |
› See the customer review...
