The Digi-T system is quick, secure, and easy to use. The rubber eye guard is removed from the eyepiece, The Digi-T threaded ring is slipped over the top of the eyepiece and the 3 set screws are tightened into the groove left vacant by the rubber eyeguard, the proper step ring then couples the Digi-T ring to the camera.

The Auxiliary Port Accessory was designed to expand your Advanced GT's ability to interface with multiple devices including personal computers and the Celestron CN-16 GPS. The Auxiliary Port Accessory has a PC port which allows the user to update motor control firmware downloaded from the internet. It has two auxiliary ports, one for the NexStar Hand Control and one for the CN-16 GPS Accessory. The Auxiliary Port Accessory can also be used on the NexStar "i" series telescopes for upgrading motor control firmware. The Auxiliary Port Accessory comes standard in the CN-16 GPS Accessory Kit for the Advanced GT Series (#93966). The Programming Cable is NOT included in the CN-16 GPS Accessory Kit for the Advanced GT Series

Set #2 (4 filters): #11 Yellow-Green; #25A Red; #47 Violet; #82A Light Blue.#11 Yellow-Green (78% transmission) - Contrasts well with the red and blue characteristics of surface features on Jupiter and Saturn. Darkens the maria visible on Mars, and clarifies the Cassini division in Saturn's rings.#25A Red (14% transmission) - The #25A filter strongly blocks the transmission of blue and blue-green wavelengths, resulting in very sharply defined contrast between, for example, blue-tinted cloud formations on Jupiter and the lighter-toned features of the disc. Also useful for the delineation of the Martian polar ice caps and maria. Because of its relatively low total light transmission the #25A filter should be employed on telescopes of 8" aperture and larger.#47 Violet (3% transmission) - Strongly rejects red, yellow, and green wavelengths; useful for the study of Martian polar cap regions and for the observation of occasional phenomena in the upper atmosphere of Venus. Enhances contrast between the rings of Saturn. Use only on telescopes of 8" aperture and larger.#82A Light Blue (73% transmission) - Useful on the Moon, Mars, Jupiter, and Saturn, this subtle pale blue filter enhances areas of low contrast while avoiding significant reduction of overall image brightness. A valuable filter to piggyback with other filters.

Dovetail Tube Plate Attaches tube rings and telescope to Great Polaris style mounts. Weight: 160 grams / 5.6 oz

Serious observers who want the best views of all types of celestial objects should add this comprehensive filter set to their arsenal. Includes a variable polarizing filter, four planetary filters (#80A medium blue, #25 red, #58 green, and #15 deep yellow), and a SkyGlow broadband light-pollution filter, plus a new hard case. Filters are optical glass with anodized aluminum cells; 1.25" size. Save big on this "mother of all" filter sets!

A necessity for any serious astrophotographer, the flip-mirror system allows you to use both an eyepiece and a camera and "flip" between them to center, compose and focus your image before shooting. Includes adjustment screws and locks for precise image centering. UHTC coatings.

Meade Eyepiece Filter 21 Orange 1.25

Meade Wireless Autostar II's system uses radio frequency signals instead of infrared, so you won't have to be in direct line of sight for proper operation. The controller is on a separate communication code so that any number of astronomers observing together using Wireless AutoStar II controllers will not interfere with each other.The Wireless Autostar II features enhanced ergonomic design for hand-held comfort. The adjustable brightness, red back-illuminated buttons with improved tactile-response send instantaneous commands to the telescope. Those familiar with using the corded version of the AutoStar II will easily master the Wireless AutoStar II with its new button arrangement and familiar two-line, sixteen character scrolling LED display.

Designed to fit snugly over the aperture of your telescope, these optical glass filters block 99.9% of incoming sunlight, allowing you to safely observe sunspots and solar granulation in the sun's photosphere, and in the sun's natural color. The glass elements are machine-polished and triple-coated with nickel-chromium stainless steel for a scratch-resistant surface. Each filter is mounted in an aluminum cell and supplied with foam tape liner to accommodate slight variations in size.

Prime focus camera adapters couple of a camera body (with its model-specific T-ring) to a telescope for prime focus photography. Model #5269 is compatible with refractor and reflector telescopes that have a 2" focuser. The adapter slips into the focuser and is secured like an eyepiece. The adapter's external threads permit mounting of the T-ring for your camera.