Astrodon Tru-Balance I-serie C-filter 50mm Unmounted (Clear Filter)

Astrodon Tru-Balance I-serie C-filter 50mm unmounted (Clear filter)

Astrodon Tru-Balance RGB filters have revolutionized CCD imaging. Their popularity is due to ease-of-use, high optical throughput and great resulting color for galaxies, star clusters and nebulae. There are two varieties of Tru-Balance filters - E-Series and I-Series.

I-Series filters are designed to approximately equalize the flux of Kodak's Interline (I-Series) CCD detectors, including compensation for the solar photon flux. This means that your RGB color combine weights will be approximately 1:1:1 within perhaps 10%. This can never be perfect, but it does allow you to take equal time exposures for your RGB data and also just one corresponding dark exposure time.

• 1.25" mounted, 49.7mm dia., 49.7mm square
• ~1:1:1 color combine weights for G2V white-point for Kodak Interline (I) detectors
• Equal RGB exposures and one dark time
• Better color separation (spectra)
• Better color rendition for galaxies based upon color theory
• Significant reflection and star halo reduction
• Enhanced contrast for HII regions in galaxies
• Spectral "gap" to minimize effect of light pollution
• Highest efficiency blue filter with less UV
• Correct "teal" OIII color for planetary nebula
• More parfocal - thickness 3+/-0.025 mm*
• Parfocal with Astrodon's high-performance narrowband and near-IR filters
• Striae-free 1/4 wave fused silica substrates
• 30 arcsec parallelism
• Ultra-hard and durable sputtered coatings
• Proudly made in the U.S.A.