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Optolong Venus & Ultraviolet Venus-U Filter - 1.25"
รายละเอียด
รายละเอียด
1. IR Pass685 Introduction
Optolong Venus-U filter makes it possible to obtain photographs, CCD or video images in the UV-A (320-400nm) and observe Venus’ cloud structures.
Main Use
Use with monochrome CCD cameras and you need to remove the cover glass of sensor and internal UV-IR blocker in order to pass UV light. The same holds true for mono DSLRs that its built-in low pass filter needs to be removed. What’s more, you need a special UV lens together with camera body. The sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range.
Act as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.
Ultraviolet photography finds practical use in medicine, dermatology, botany, criminology and theatrical applications.
WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.
2. Venus-U Filter Spectrum and Characteristic
Sbustrate: B270
Thickness: 1.85mm
Tave: T>90%
Blocking range: 200-1100nm
Blcoking depth: light pollution line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism: 30s
How to read the chart?
▲The horizontal axis is the Wavelength in Nanometers(nm).
▲The vertical axis is transmission in %.
About Optolong
While Optolong is a relative newcomer to the astronomy industry, they are no strangers to optics and filters. Optolong is a division of Yulong Optics Company, a high tech company specializing in optical filter design and production. Their products include bandpass filters, flourescence filters, edge filters, longpass and shortpass filters, beam splitters, anti-reflection coatings, optical mirrors and, of course, astronomical filters.
Established in 1999 and based in Kunming City, China, Optolong/Yulong provides nearly 2000 types of optical filter coatings annually to customers worldwide in a wide variety of industries and applications.