GSO 8" f/4 Imaging Newtonian Reflector Telescope

Portable, Light Weight, and Economical - The GSO 200mm (approx. 8) f/4 imaging Newtonian offers a fast focal ratio that's ideal for capturing wide-field images of hundreds of celestial objects. The 800mm focal length keeps the tube length to a compact 27.75, making it easier to ...Portable, Light Weight, and Economical - The GSO 200mm (approx.

8) f/4 imaging Newtonian offers a fast focal ratio that's ideal for capturing wide-field images of hundreds of celestial objects. The 800mm focal length keeps the tube length to a compact 27.75, making it easier to guide during extended exposures. With a total weight of only 19lbs-10oz (16lbs-4oz with OTA and focuser only) this scope is ideal for use with compact and precision equatorial mounts such as the Skywatcher EQ-6, Wave 150i or ZWO AM5.

And with a price that's far less than a small ED refractor or Ritchey-Chretien scope, this OTA offers an economical alternative for beginning imagers.2. Full Optical and Mechanical Testing and Quality Control - An Agena Exclusive! GSO telescopes are available from several suppliers, but Agena does much more than simply move the telescope boxes from GSO to you. - Every GSO telescope is inspected to ensure good cosmetics, collimation, smooth focuser operation, and to make sure all parts are included by the manufacturer.

This is a qualitative method to evaluate primary mirror smoothness and figure. Fast and Precision Optics - The precisely figured 8 f/4 primary mirror is made from BK7 optical glass for enhanced thermal stability. BK7 is far superior in thermal characteristics to soda lime float glass - the glass used in consumer products like cookware - that's used in many reflectors in this price range.

The mirror is coated with enhanced aluminum to at least 92% reflectivity and coated with a protective layer of Si - O2 (quartz) for durability. The primary mirror is mounted in a cell with six external push-pull collimation knobs on the back of the tube, and the center-marked primary makes collimation with a laser a snap. - With a cropped-sensor DSLR/mirrorless camera or an astronomy camera such as the ZWO ASI2600MC Pro with an APS-C sensor, this scope gives a field of view across the diagonal of nearly 2 degrees, more than enough to frame the brightest regions of extended deep-sky objects like the Andromeda and Triangulum galaxies, the Orion Nebula, and the Horsehead Nebula.4.

2 Dual-Speed EAF-Compatible Crayford Focuser and Accessories - The solid 10:1 dual-speed 2 Crayford-style focuser handles small to mid-sized astronomy cameras and webcams. It also has a tension knob and a locking knob to allow you to secure the cameras and accessories. - The ridged focus knobs give you a good feel and grip, even with gloved hands in cold weather, and the 10:1 fine focus knob lets you snap your image into perfect focus.

The drawtube of the focuser is engineered to have minimal wear and minimal flexure with most cameras. It offers 41mm of focus travel and includes a focusing scale on the top of the drawtube to make it easy to return to the correct focus position during each observing session. - This telescope features GSO's latest EAF-compatible focuser design so you can attach the ZWO EAF directly without the need for any additional adapters.

The bottom of the focuser now incorporates a flat surface with additional screw holes to allow users to easily and directly mount the ZWO EAF using the standard mounting bracket that the EAF comes with. The housing in this version is also made of aluminum for a secure, robust fit. Imagers can now use the EAF to precisely control the focuser's movement for visual or critical imaging applications.

Note that the EAF is not included. - This OTA comes with a 1.25 eyepiece adapter with compression ring so you can use cameras with 1.25 nose pieces, and it includes a 2 extension tube with 35mm (1.38) extension to give you flexibility in back-focus adjustment for visual use. This instrument can also be used with 1.25 or 2 eyepieces for visual observations of solar system or deep sky objects.

It includes a big 8x50