filter
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Filter
Astrodon Photometrics Johnson-Cousins Filters
- Spectral profiles designed after UV, B, V, Rc, Ic Johnson/Cousins
- Improved B filter extending blocking >1100 nm and eliminating small light leaks that affected measurements of reddest stars in our initial filters
- 100% coated – no colored glass
- Peak transmission guaranteed > 90%
- <0.01%T(ave) typical out-of-band 300 – 1100 nm; additionally =<0.1% Tabs for B***
- Striae-free, single fused silica substrates
- 1/4-wave propagated wavefront prior to coating
- <0.5 arcminute substrate parallelism
- 3.000 +/-0.025 mm substrate thickness
- Parfocal with all Astrodon filters
- Edge-blackened
- 1.25″ mounted
JOHNSON-COUSINS B∗∗∗
JOHNSON-COUSINS V∗
JOHNSON-COUSINS Rc
JOHNSON-COUSINS Ic
filter.1544449553.txt.gz · Zuletzt geändert: 2020/11/22 16:45 (Externe Bearbeitung)