Lumicon Minus Violet and Infrared Blocking Filters are used primarily to "bracket" the color-corrected band of refracting telescopes. The Minus Violet and Infrared Blocking Filters can also be used as "visible" filters in RGBV (red-green-blue-visible) astrophotography with reflecting telescopes. The larger Minus Violet filters are for telephoto lenses.

Most digital/CCD cameras have built-in infrared filters, in which case either the Lumicon Minus Violet and Infrared Blocking Filters may be used. The choice would depend on how far into the blue your primary lens is color-corrected. The Minus Violet filter blocks wavelengths shorter than about 420nm; the Infrared filter blocks wavelengths shorter than about 400nm. If your camera does not have a built-in infrared filter, the Infrared Blocking Filter is recommended, which blocks all wavelengths longer than 750nm.

The LF3120, 2" Minus Violet Filter, threads into the nose-piece of industry-standard 1.25" Digital Imagers.

• Used primarily to "bracket" the color-corrected band of refracting telescopes

   

   

• Blocks wavelengths shorter than about 420nm; the Infrared filter blocks wavelengths shorter than about 400nm

   

   

• Can also be used as "visible" filters in RGBV (red-green-blue-visible) astrophotography with reflecting telescopes

   

   

• Made using thin-film dielectric coatings on optically flat glass. These exclusively designed dielectric coatings consist of over 30 alternating layers of several different materials

   

   

• Threads into the nose-piece of industry-standard 2" Digital Imagers

Filter Type: MInus Violet

Application: Photographic

Filter Size: 2"

Presentation: Round, threaded cell