For sale is a used, but in as new condition, Optolong UV IR Cut Filter, 2-inch size. Purchased in Aug 2022 from
https://www.testar.com.au/products/o...-ir-cut-filter and used dozen of times. Still under Optolong's 3y warranty:
https://www.optolong.com/cms/documen...il/id/149.html.
Description:
The Optolong UV/IR cut filter is designed to block ultraviolet and infrared wavelengths and to capture the luminance in monochrome cameras.
Also, this filter is needed to cut off unwanted wavelengths in colour cameras which are sensitive to these radiations. Using one shot colour cameras without this filter will cause unnatural colour balances.
In refractors, the Optolong IR/UV cut is highly recommended to reduce the chromatic aberration, even in apochromatic telescopes as they are not corrected outside the visible spectrum.
Technical Data:
Schott substrate material Thickness 2.0mm. Surface Quality: 60/40 (Refer to MIL-O-13830). Fine-optically polished to ensure accurate 1/4 wavefront and <30 seconds parallelism over the both surfaces 95% transmission at visible spectral region 420-680nm highly passing the major nebula emission lines of H-Alpha 656nm, SII 672nm and NII 654nm and 658nm Ultraviolet 300-400nm and infrared wavelength 700-1100nm cut-off 0.1% transmission of off-band. Transmission of 0.1% is equivalent to OD3(Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.
Coating Parameter:
Multi-layers anti-reflection coating Non-cementing optical substrate coating Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band
What's included:
- Optolong UV/IR Cut Filter 2-inch.
- Plastic protective case.
- Cardboard original case.
Full specs:
https://www.optolong.com/cms/documen...il/id/146.html
Condition: Used, excellent.
Reason for sale: Not required anymore.
Price: $90 shipped metro Australia.
