Assortment of high-quality telescope filters

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On offer here is an assortment of telescope filters and filter sets, all of high quality and from well-known companies at the forefront of this aspect of astro technology. Such an assortment does not lend itself to uniform pricing, and the amount specified here represents the cost of a likely selection. The individual prices are given in the relevant sections.The filters are as follows: Baad er Planetarium2 sets of colour filters, one for 2" eyepieces, the other for 1.25" EPs. Each set contains six colour filters, as follows PRICE dark blue 435 nm bright blue 470 nm green 500 nm yellow 495 nm orange 570 nm red 610 nm 2" colour filter set £145 1.25" colour filter set £90 both colour filter sets £225These filters enable the observation of fine planetary detail. They achieve their effect firstly by the careful selection of the wavelength transmission of each filter; secondly by ensuring the maximum transmission of each filter's wavelength. The transmission of the three longpass filters, yellow, orange and red, is 98%, that of the other three, bandpass filters is 70%. Those familiar with suchstatistics will realise that these transmission levels are extremely high.Further advantages of these Baader filters include the following.These filters have the largest clear aperture for their size currently on the market. This ensures complete avoidance of vignetting at any wavelength.These filters are designed with a series of milled notches to their front. This takes a great deal of sweat out of installing and handling in the dark.These filters are treated with a 7-layer Multi Coating on all surfaces. This reduces reflections to no more than 0.25%. Baader Planetarium PRICE 2 double polarising filters,one for 2" eyepieces, the other for 1.25" EPs 2" double polariser £70 1.25" double polariser £45 both double polarisers £105 A telescope polarising filter serves to reduce the glare and, in consequence, to enhance the contrast of bright celestial bodies. This filter's commonest application is to the moon. Additionally this filter has application to planets, at relatively high magnification. And, by eliminating colour fringing, polarising filters are excellent for splitting double stars.Unlike an ND filter, a polarising filter achieves a range of brightness reduction, depending on its rotation and its angle with respect to the light source. This is particularly the case with a double polariser, in which two polarising filters are stacked, in an aluminium cell. These Baader double polarisers achieve a reduction range from 35% to 80%. Lumicon PRICE 2 Ultra High Contrast filters,one for 2" eyepieces, the other for 1.25" EPs 2" UHC filter £145 1.25" UHC filter £60 both UHC filters £195 2 OxygenIII filters,one for 2" eyepieces, the other for 1.25" EPs 2" OIII filter £145 1.25" OIII filter £60 both OIII filters £195 The Lumicon UHC filter is claimed as the ultimate filter for observing nebulae. The filter achieves its effect by blocking all wavelengths except the two oxygen lines of 495 nm and 501 nm, and the Hydrogen beta line of 486 nm, which are present in the spectra of all nebulae, and by ensuring maximum transmission of these three wavelengths. Each filter comes with a list of its transmission percentages, and the figures are truly impressive..This filter is especially successful in the observation of the Orion, Lagoon and Swan nebulaeThanks to this wholesale blocking of wavelengths, light pollution and Sky Glow are no longer a problem.The Lumicon OIII filter is used in observing diffuse and planetary nebulae, and faint nebulae in general. The filter achieves its effect by an even more aggressive blocking of wavelengths than the UHC, since it additionally blocks the Hydrogen beta wavelength of 486 nm, allowing transmission of only the two oxygen lines of 496 nm and 501 nm. Additionally maximum transmission of these two wavelengths is ensured. Each filter comes with a list of its transmission percentages,... read more

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