Secondhand & Stock

The Altair 2" Solar Continuum filter Enhances sunspots, granulation, and fine photosphere detail. For use with Baader Solar Filter or Herschel Wedge. IMPORTANT SAFETY INFORMATION: DO NOT USE THIS FILTER FOR DIRECT SOLAR OBSERVATION! Must be used together with a professional solar filter or Hershel Wedge with Max. 0.024% transmission placed BEFORE this filter. For reflecting telescopes, we recommend Baader solarfilm on the front of the telescope, then screw the filter into a filter holder, camera, or eyepiece. For refractors, the filter should be positioned just in front of the camera or eyepiece with a Hershel Wedge in place. Do not use this filter without a suitable solar pre-filter in place, because it will permanently damage your eyes or camera! The Solar Contrast Booster works by filtering out UV, IR and visual wavelengths except for a narrow 8nm FHWM green band at 540nm. This greatly increases the contrast of solar features when viewed with the naked eye, colour or mono camera, revealing more detail around sunspots and granulation (fast-developing solar convection cells) in the solar photosphere. Highly recommended for use with either Altair Imaging-Ready APM Hershel Wedge or Baader Solar Film. NOTE: Do not insert the filter before your Hershel Prism or it will melt, it should be placed just in front of the camera, and it should be screwed directly into your camera 2" nosepiece by means of the M48x0.75mm thread, E.g. Hypercam 2" nosepiece or use an Altair Magnetic Filter holder with 2" filter slider (Search product code starting with "MAGF" and choose the correct threads for your camera). Why is transmission centred on 540nm wavelength? 540nm is a very desirable wavelength for imaging and observing the sun. The Solar Contrast Booster filter improves performance of any telescope optics such as Refractors, Newtonian reflectors, Maksutovs, Dall Kirkhams, Cassegrains, and SCT's. It's especially recommended with Frauenhofer Achromatic refractors and short focal length ED Doublets, because their optimum performance peaks in this green wavelength by design. In fact, not only Achromats, but most ED triplet and APO refractors traditionally have peak performance at 540nm wavelength, where the human eye shows best sensitivity. 530-540nm is not only the traditional "design benchmark wavelength" for most telescope optics, and also that of most high end interferometry equipment used to configure and optimise telescope lenses. Most colour and mono CMOS cameras also have peak sensitivity and resolution in green! Colour CMOS cameras in particular have an RGGB pixel layout with two green pixels for every one blue and red pixel, for an obvious increase in resolution. The are therefore many benefits in isolating this wavelength to capture those fleeting moments of good seeing. Altair Solar Contrast Booster filter specifications: Standard 2" Filter Thread Aluminium Cell Band CWL540nm 90% transmission FWHM 8nm 1.85mm thick optical glass λ/4, Parallelism (arcsec) 30" Si02 "hard" overcoat with UVIR Block 300-1100nm and Anti-Reflection Coating Scope of Delivery: Solar Contrast Booster Filter 2"

Item condition: new and original packed

Altair TMS 180mm Losmandy dovetail plate BLUE anodized

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Altair TMS 250mm Losmandy Dovetail Plate BLUE Anodized

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Altair TMS Losmandy Dovetail Plate 180mm Silver

Item condition: new and original packed

Altair TRI-RGB Light Pollution Filter 2"

Item condition: new and original packed

Weight : 4 Kg Outer dimensions : 570x260x200mm Inner dimensions : 550x240x190mm colour blue Usable internal dimensions (empty case): 200x240x150mm Item condition : Pair of used stripes

Item condition: used, but with visible cosmetic markings

APM - 28x110 MS Binocular

Item condition: new, but not original packed

APM - LZOS Telescope Apo Refractor 228/2050 CNC LW II, Serial Nr. 027 , Testdata at 532 nm : Strehl 95.9 %, Wavefront RMS 0,032 , Wavefront P.t.v. 0,165

Item condition: new and original packed

APM MS 11 x 70 Magnesium ED APO Binocular with Nitrogen Fill. Weight 2114 grams Delivery contains: Binoculars 11 x 70 Tripod Adapter Carrying Bag Carrying Strap Lens Caps Eyepiece Caps

Item condition: new and original packed

APM 100 mm eyepiece 3.1" ( diameter barrel 78 mm ) with approx. 50 degree field of view, field diaphragm 68 mm diameter, multicoated

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.

APM 2 inch Diagonalprism with Fast-Lock and Ultra Broadband Coating

Item condition: new and original packed

APM Ceramic Safety 2" Herschelprism with APM Fast-Lock Eyepiece Adapter.For solar white light imaging and white light visual observing. The APM White Light Wedge comes with a built in ND3 filter which allows perfectly safe imaging or visual observing of the Sun. The APM Herschel prism is equipped with the ceramic light trap, an multicoated integrated multicoated ND3 filter and (removable) multicoated polarizing filter. The sun can be safely observed with the APM Herschel Prism.The image brightness can be adjusted by twisting of the 2 "polarizing filter by rotating the 2" eyepieceholder from outside . Thus, the Herschel Prism can be used both visually and also photographically same good!

Item condition: new and original packed