Astrodon introduces a breakthrough in UV filters for CCD imaging. A durable, hard--coated UV filter of the highest quality having the best transmission available.
- Image the cloud structure of Venus and Jupiter with CCD cameras on a telescope
- Use for general UV photography (flowers, insects, forensics)
The Astrodon-Schuler UV filter has traditionally been used for imaging Venus. It is made from several colored glasses, but only transmits ~ 65% of incoming UV light in the 300 - 400 nm region.
Another vendor recently discontinued a 1.25" mounted UV filter due to NIR light leakage, but offers a 2" unmounted version that only reaches 80%T. Astrodon offers you both sizes and higher performance.
Like our highest quality Generation2 Astrodon LRGB filters, theUVenus filter minimizes halos around bright stars.
Astrodon UVenus filters are guaranteed to achieve >90% transmission. The actual scan below has an average transmittance of 98.2% from 325 - 381 nm, while minimizing out-of-band light leakage. This outstanding performance saves you time when imaging weak UV signals, while providing high contrast due to low light-leakage.
You do not need a separate filter to block the NIR with the UVenusfilter.
- 1.25" mounted and 49.7 mm diameter unmounted
- 3.000+/-0.025 mm substrate thickness
- Single, striae-free fused silica substrate
- 1/4 wave substrate prior to coating
- < 0.5 arcminute parallelism before coating
- Hard coated to edge
- Guaranteed to > 90%T peak transmission (>94% typical)
- <0.01%T 285-305 nm; <0.1%T 420 - 1100 nm
- Image Venus during daylight due to elimination of all visible light
- Proudly made in the U.S.A.
This filter is NOT to be used for visual observations, specifically the sun or UV light sources.