4/20/09 filter_list.doc 1 AA--WING OBSE RVATORY WING OBSE RVATORY ---- FILTER LIST FILTER LIST University of WashingtonUniversity of Washington Model/ Manufacturer Name Central wavelength / Bandpass Comments / Use SBIG (standard)* U SBIG (standard)* B SBIG (standard)* V SBIG (standard)* R SBIG (standard)* I SBIG (standard)* Clear Custom Scientific Bessel U Band Custom Scientific Bessel B Band Custom Scientific Bessel V Band Custom Scientific Bessel R Band Custom Scientific Bessel I Band Sirius Optics Nebular Filter 4887 SBIG H-alpha 565.3 nm / 3.0 nm too narrow for us SBIG [O III] 500.7 nm / 3.0 nm too narrow for us Lumicon Deep Sky H-beta 93% [O III] 496 92% [O III] 501 93% H-alpha 96% Orion Ultrablock skyglow 480 - 520 nmModel/ Manufacturer Name Central wavelength / Bandpass Comments / Use Meade 4000 No. 12 (74% transmission) Contrasts strongly with blue-colored features on Jupiter and Saturn, while enhancing red and orange features. Lightens red-orange features on Mars, while reducing or blocking the transmission, and thereby increasing the contrast, of blue-green areas. Useful in increasing the contrast of lunar features in telescopes 6" aperture and larger. Meade 4000 No. 23A (25% transmission) On telescopes of 6" aperture and larger the #23A does approximately the same functions as the #21 filter, but with stronger contrast and enhancement of marginally defined blue-green surface detail. Useful primarily on Jupiter, Saturn, and Mars. Increases contrast between Mercury and bright blue sky during daylight observations or during twilight. Meade 4000 No. 58 (24% transmission): Use on telescopes 8" aperture and larger to reject blue and red-toned structures on the surface of Jupiter and thereby increase their contrast relative to lighter parts of the disc. Also use for the enhancement of Saturn's cloud belts and polar regions. Strongly increases contrast of Mars' polar ice caps, and increases contrast of atmospheric phenomena on Venus. Meade 4000 No. 80A (30% transmission): A popular filter for the study of Jupiter and Saturn. Enhances contrast of rilles and festoons in Jupiter's cloud belts, as well as details of the Red Spot. Brings out detail in Saturn's belts and polar phenomena. Very useful as a contrast-enhancing lunar filter. SBIG red continuum 645 nm / 10 nm SBIG green continuum 510 nm / 10 nm Orion Variable Polarizer 1% - 40% *Two complete sets + skyglow References http://www.buytelescopes.com/product.asp?t=&pid=3480&m=72 http://www.lulin.ncu.edu.tw/lot/LOT_2003_Filter_Set_Transmission_Curves%5B1%5D.pdf http://www.sbig.com/sbwhtmls/online.htm