SIRIUS FILTERS:Variable | RGB | Planetary Contrast | Neodymium | Minus Violet | Contrast Enhancement | IR Blocking | Nebula
This is a radical departure from the conventional filter design. One filter that does it all. It can be adjusted to become a Nebula or a Broad Band, Ha Filter. The filter is 71mm in diameter and is housed in an aluminum cell that accepts 1.25" eyepieces and is inserted into the telescope focuser. An exposed wheel permits the observer to continually adjust the spectral response. We have found it to be excellent on planets also. Further adjustments can be made for contrast improvements on various objects. Since most objects do not respond identically, this filter can be adjusted to optimize the effect accordingly.
The Sirius Optics RGB-1.25 filter wheel utilizes the revolutionary design introduced with our Variable Filter System. Instead of the variable filter, this unit has an anodized aluminum wheel with four holes. Three of the holes are filled with parfocal Red, Green and Blue interference filters, the fourth hole left empty. By manually turning the wheel, each color magnetically aligns with the optical path for a positive filter placement.
Furthermore, a Near Infrared Blocking filter, which has been placed off-angle in the body of the unit, rejects all IR up to 1000 nanometers. Off-angle orientation eliminates any internal reflection. Typical Transmission Curve Chart for the RGB filters. This graph does not represent the Near IR Blocking filter included in the RGB-1.25
The Planetary Contrast Eyepiece Filter has three peaks of high transmission with the regions in between being heavily rejected. This sort of filtration is impossible with dye-in-glass filters. This filter will show increased contrast and detail on various objects. The greater the spectral output of an object, the greater the effect. Jupiter and Mars should do well.
The NPC Filter is designed primarily to reduce the unfocused violet halo seen through common refractors around bright objects. It utilizes Neodymium glass as the basic substrate. Neodymium is a rare-earth metal with unusual spectral properties when infused into glass. It absorbs parts of the yellow and green regions of the color spectrum, giving it a bluish cast. It was discovered when combined with the MV1 filter, the resultant image becomes very neutral. The MV1, by itself imparts a slight greenish yellow cast. By coating the Neodymium glass with the MV1 formula, we get the best of both in one filter. The overall transmission will be about 78%.
Minus Violet 20 Eyepiece Filter The MV20 filter is a variation to our Minus Violet filter. This is the second generation MV filter. The MV20 filter was designed with a more neutral appearance in mind. The mid-priced achromatic refractors would do well with this filter. The MV20 is allows a little more of the unfocused violet and deep blue found in typical refractors and balances it out with additional rejection of the yellow region to balance color rendition. Unlike the MV1, the MV20 does not reject the IR region.
This is absolutly the filter for scopes under 100mm. The Contrast Enhancement Filter will not darken the sky as much as an LPR filter, but will increase overall contrast between stars and the sky background. The spectral region with significant light scatter is toward the blue (440-470nm). This scatter is seen during the day as the blue sky. The yellow region is left largely untouched. This will keep stellar brightness near normal, with some minor color shift. The CE1 will improve contrast to a larger number of objects than the typical Nebula and LPR filters. We provide each Sirius Filer with an individual serialized test report guaranteeing the performance.
The NIR filter has standard threads and mounts on most eyepieces, diagonals and camera adapters. The Sirius Optics Near Infrared blocking filter is designed block out the IF saturating energy that can blur the images on a CCD camera, modified web cams and Video cameras. It is a multiple-layer interference coating deposited onto optical glass and is mounted into a standard 1.25-inch threaded barrel that screws into the nose of CCD cameras and adapters. CCD chips are sensitive in the near infrared (NIR). Although shorter exposures generally require no IR filtering, longer exposures with CCD cameras usually result in images blooming, because of the sensitivity in the infrared. This filter nearly eliminates this NIR from 700nm-950nm while keeping the transmission very high across the visible spectrum, thus removing the blooming affect from long exposure images. The filter is virtually clear in the visible light spectrum, so it causes no color shift of captured objects. We provide each Sirius Filer with an individual serialized test report guaranteeing the performance.
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MV1 Minus Violet Filter is a specialized corrective filter that greatly reduces the annoying false color fringing of violet rim of light around very bright objects in refractors. This effect is common in relatively moderately price achromatic refractor telescopes such as the Celestron's, Meade's, Orion's, Konus and Skywatcher's. With the MV1 attached to your eyepiece in these scopes, you will get sharper images and higher possible magnification. Use day or night. In testing one Konus 120mm F/8 scope we were able to increase the usable magnification from 200x to 255x with the same sharpness and less false color. We provide each Sirius Filer with an individual serialized test report guaranteeing the performance.
