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Ultraviolet Pass / Visible Light Block Filters

Our XNite330nm filter has a peak transmission at 330nm at 85%.  The XNite330nm transmits at 50% at 270nm and 375nm.

Our XNiteBP1 filter is a 11 layer vapor deposition coated filter designed to pass UV and visible light and block the 725nm hump in the 330nm glass.  The XNiteBP1 filter solves the infrared problem plaguing UV pass filters.  UV glass almost always has an infrared transmission frequency making true UV photography very difficult.  This is an especially big problem for digital cameras which have CCD's very sensitive in the 725nm region.

By combining the two filters, the UV photographer will be able to capture true UV pictures.

330nm Filter                                            Bandpass BP1 Filter

                                

The XNite330nm is most similar to the Wratten 18A which has a peak at 350nm and transmits at 50% at 320nm and 380nm.

Humans see from about 400nm to 750nm.  The XNite330nm has a slight peak at 720nm so a small amount of visual light and infrared light pass through the filter.

Insects view their world primarily in the UV range.  Hence, flowers look different under UV than under visible light than under IR light.  UV filters are also used by forensic experts to find traces of writing invisible to the human eye.  Sometimes this is done by directly photographing with a UV light.  Sometimes this is done using a UV pass / visible light block filter like our XNite330nm on a flash while using an IR filter on the camera.

We have tested the combination of the 330nm filter and the BP1 filter to see if we could see common invisible ink (longwave fluorescing) such as used for hand stamps, security control and such.  Under sunlight, we were able to see the ink, though the camera sensitivity was not great in the UV range.  

330nm and BP1 filter to see invisible ink

The written words visible in this shot are completely invisible to the human eye normally.  The writing could also be seen by illuminating under a 365 - 400nm light (blacklight).

Below are some outdoor pictures taken on a cold, autumn day using our modified IR enabled Sony DSC-F717 digital camera.

Normal picture
 

330nm filter

330nm and BP1 filter

330nm and BP1 filter in B&W conversion

 

   Quantity XNite30025: X-Nite 330nm Filter in 25mm Diameter x 2mm Thick $76.00
   Quantity XNiteBP125: X-Nite Band Pass Series 1 (BP1) 320nm-670nm Filter in 25mm $55.00
   Quantity XNiteUVR25: X-Nite Ultraviolet UVR Filter in 25mm Diameter x 2.2mm Thick $72.00

   Quantity XNite33025.5: X-Nite 330nm Filter in 25.5mm Diameter x 2mm Thick $76.00
   Quantity XNiteUVR25.5: X-Nite Ultraviolet UVR Filter in 25.5mm Diameter x 2.2mm Thick $72.00
   Quantity XNite30030: X-Nite 330nm x 2mm Thick Filter in 30mm Diameter $76.00
   Quantity XNiteBP130: X-Nite Band Pass 320nm-670nm Filter in 30mm $55.00
   Quantity XNiteUVR30: X-Nite Ultraviolet UVR Filter in 30mm Diameter x 2.2mm Thick $72.00
   Quantity XNite33037: X-Nite 330nm x 2mm Thick Filter in 37mm Diameter $96.00
   Quantity XNiteBP137: X-Nite Band Pass 320nm-670nm Filter in 37mm $75.00
   Quantity XNiteUVR37: X-Nite Ultraviolet UVR Filter in 37mm Diameter x 2.2mm Thick $89.00
   Quantity XNite33058: X-Nite 330nm x 2mm Thick Filter in 58mm Diameter $171.00
   Quantity XNiteBP158: X-Nite Band Pass 320nm-670nm Filter in 58mm $125.00
   Quantity XNiteUVR58: X-Nite Ultraviolet UVR Filter in 58mm Diameter x 2.2mm Thick $125.00
   Quantity XNite33067: X-Nite 330nmFilter in 67mm Diameter x 2.2mm Thick $240.00
   Quantity XNiteUVR67: X-Nite Ultraviolet UVR Filter in 67mm Diameter x 2.2mm Thick $145.00
   Quantity XNite33072: X-Nite 330nm x 2.2mm Thick Filter in 72mm Diameter $315.20
   Quantity XNiteBP172: X-Nite Band Pass 320nm-670nm Filter in 72mm $195.00
   Quantity XNiteUVR72: X-Nite Ultraviolet UVR Filter in 72mm Diameter x 2.2mm Thick $145.00
   Quantity XNite33082: X-Nite 330nm x 2mm Thick Filter in 82mm Diameter $325.82
   Quantity XNiteBP182: X-Nite Band Pass 320nm-670nm Filter in 82mm $275.00
   Quantity XNiteUVR77: X-Nite Ultraviolet UVR Filter in 77mm Diameter x 2.2mm Thick $165.00


Related Shortwave Products

   Quantity FlashUV4: Single Range Ultraviolet Handheld Flashlight 365nm x 2.0 Watt $55.45
   Quantity FlashUV7: Handheld 4 Watt 254nm Filtered Ultraviolet (UV) / Normal light $96.00
 
   Quantity UVSWG: 5 Grams Ultraviolet Shortwave Green Fluorescing Powder $43.86
   Quantity UVSWR: 5 Grams Ultraviolet Shortwave Red Fluorescing Powder $43.86

 

 

               

                                

 

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Last modified: October 19, 2007