![]() The inside surface of this tube is black-matted to enhance contrast by reducing stray light reflections. This practical and superb quality adapter is made from precision machined aluminum and is black anodized. ![]() Its long length ensures that the adapter works well with smooth and recessed eyepiece barrels. The helical centering mechanism is controlled by an inner polypropylene compression ring (or collet) that will not mar your eyepieces. This mechanism is easily tightened or loosened by turning the large knurled twist lock ring at the top of the adapter. Instead of a conventional locking thumbscrew that can push the eyepiece to one side, this innovative adapter uses a helical compression mechanism to not only grip the inserted eyepiece securely, but also center the eyepiece accurately within the adapter in the process. This popular eyepiece adapter allows 1.25" eyepieces and accessories to be used in 2" focusers, diagonals and barlows. Sky-Watcher GoTo Dobsonian and EQ Mount Sale.Color Correction & Minus Violet Filters.Correctors, Focal Reducers & Flatteners.Back focus from top of threaded collar: 72.8mm (2.Back focus with included camera adapter: 55mm (2.16").Off-axis Illumination: 83% at 21mm (.82") off-axis.Useable field: 52mm (2.04") Ø, 4.8° only minimal performance loss at edge of FOV.Resolution (Rayleigh): 0.49 arc seconds.Light Gathering Power (Compared to human eye): 1588x.Central obstruction diameter: 114mm (4.48") (41% of aperture diameter).Optical Design: Rowe-Ackermann Schmidt Astrograph.Product carries a 2-year manufacturer warranty (US/Canada only) Down to the thickness of the glass used in the included fully-multicoated optical window or optional imaging filter, every component of the system has been taken into careful consideration to work together seamlessly. The Dovetail CGE bars on the top of the optical tube provides a connection for use of optional accessories like a guidescope. Every so often, however, a vendor goes above and beyond good customer service and that should be noted for the benefit of us all. The integrated 12V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube.Įngineered as a complete astroimaging system, every component of the RASA 11 V2 is optimized for peak performance with DSLR and astronomical CCD cameras. of 3 - Thumbs Up to Agena Astro - posted in Equipment (No astrophotography): I have generally had good experiences with the astronomy vendors with whom I have done business. Shop for gender changer adapters of varying conversions from brands like Baader and Blue Fireball, all available here at Agena AstroProducts. Thread one or two 2' astronomical filters into the M48 female thread inside the longer Filter Chamber adapter ( F-24) Screw the Filter Chamber adapter (containing. Thread the shorter Chamber Cover adapter ( F-04) on to the 2'x24TPI male SCT thread on the rear of your telescope. The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). How to Use: Unscrew the two parts ( F-04 and F-24) completely. The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). At the heart of this system is a precision linear ball bearing. RASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). The design also provides minimal vignetting. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range-or even that of a much more expensive instrument. The RASA 11 V2 features optics with 4-element rare-earth glass for images free of false color and aberrations like coma and field curvature. Optical performance for huge sensors with diagonals of up to 52mm wide is still excellent.Ĭombine this large image circle with a focal length of just 620mm and you have an instrument suitable for wide-field imaging, creating huge mosaics of the night sky, surveying, and even comet hunting. Recessed 5mm below the M56 female thread is an M52x0.75 female thread, so this might be able to function as an M52x0.75 female to M42x0. Features an M56x0.75 female thread on one side and an M42x0.75 male thread on the other side. Today, with CCD sensor sizes as large as film or larger, the RASA 11 V2 offers a 43.3mm optimized image circle to capture pinpoint stars on the largest imaging chips. Photo adapter for Takahashi FC-60 refractor with M42 / T / T2 male threads. RASA 11 V2 builds on the legacy of Celestron’s Schmidt Cameras, which allowed astrophotographers to produce images with much shorter exposure times on film in the 1970s.
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