Baader CCD RGB 50x50mm 'unmounted filter set, square polished and optically flat
Includes: luminance (UV-IR blocking) filter 50x50mm single, unmounted, polished square and flat appearance.
The L filter is a standard Baader UV / IR cut filter and can be used both for focusing and for the inclusion of a luminance image can be used.
For astronomical objects is a low rise and decay curves of the RGB filters in the opinion of Baader unnecessary - and undesirable. In contrast to terrestrial objects astronomical objects shine in discrete emission lines.
The stars themselves obey the laws of a black body and shine in the paint caused by the stellar temperature - a smooth, wide spectrum. Shades such as in earthly objects come in light of deep-sky objects is not available. Are therefore important for the RGB image capturing extremely steep flanks of the transmission curves for each color channel - for maximum efficiency and maximum contrast between the individual lines.
The transmission at Baader RGB filters in each of the three color channels is extremely high, thus simultaneously reduce stray light and reflections on an unprecedented level. For the first time it is possible by new, more stable manufacturing processes, to allow the transmission of critical edges in the BG area of maximum slope overlap. This allows the key emission lines Hbeta and O III are separated perfectly but the O III line in both the "B" - as in "G" - color channel with maximum intensity available. This leads to a much better color balance and, above all, this design allows the energy of this important (st) s deep-sky emission line to use much more intense than before.
In the range of 580 nm, there is no significant emission line, however, there are just the main parts of the harmful light from mercury and sodium vapor lamps. This area is suppressed in the new Baader RGB filters almost completely and therefore are Baader RGB filter is particularly efficient at lichtverschmutztem sky. The blocking of the filter has been specifically adapted to the sensitivity limit of conventional CCD chips, this could be minimized can be achieved in the reflex formation , again - well beyond the previously known levels.
Mechanical properties:
- The only filter with parfocal plane polished substrates. Each individual filter is optically finely polished to 1 / 4 wavelength
- Baader filters are coated separately LRGBC hard. The individual filters are not drilled out, as usual, from large plates
- Filters have been drilled on the edge of the coating layer micro-cracks which tend to absorb moisture by capillary action
- Baader filters all have individual coating sealed coating edges, the penetration of moisture is thus impossible
- Baader filters have been in long-term aging tests (uabei B + W Filter / Schneider Kreuznach) boiled in water for an hour and remained opposed to drilled filters completely intact
- Scratch-resistant hard coatings Baader filters can be cleaned as often
Optical properties:
- NO reflections - in comparison to competing RGB filters
- RGB-balanced design allows recordings with the same exposure time - very important for automated imaging
- Maximum color contrast for each of the three RGB channels by extremely steep slopes at all transmission curves
- O III emission line in the B-and G-channel is weighted twice, with maximum transmission - for the most deep-sky quantum yield
- R-filter maximum transmission for these H-alpha and S II blocks, however, IR 680-1200 nm
- Reduces blocking between G-and R-filter light pollution from mercury and sodium vapor lamps at 580 nm darkens the sky background and improve the color balance and color separation
