Lumicon Cassegrain Easy Guider for 7 - 9.25 Inch

Lumicon Cassegrain Easy-Guider for 7-9 SCTsLumicon Cassegrain Easy-Guider for 7-9 Schmidt-Cassegrain Telescopes. The all-in-one Lumicon Cassegrain Easy-Guider is one of the most powerful astrophoto/visual accessories on the market today greatly extending the visual and photographic capabilities of your 7 to 9 Schmidt-Cassegrain telescope. You don't have to buy the focal reducing lens separatelyit's included! Competitors force you to buy their guiders and focal reducing lenses separately costing you more than the all-in-one Lumicon Cassegrain Easy-Guider. The sturdy Cassegrain Easy-Guider incorporates a unique patented radial adjustment for off-axis ease of finding bright photographic field guide-stars. The Lumicon Cassegrain Easy-Guider has both radial and rotational adjustments along with a large off-axis prism that helps make guide-star selection a breeze. The multi-coated 50mm focal reducing lens yields 100% edge-to-edge field illumination plus high-contrast pinpoint star images across a 35mm film frame. In addition not only is the Lumicon Cassegrain Easy-Guider a superb off-axis guider it is also an excellent visual focal reducing lens system. With the 50mm lens in the standard position behind the off-axis prism (on the camera side of the guider) photographic speed is about f/6.5. The fully-coated lens can also be moved to a position in front of the prism (on the telescope side of the guider) yielding an approximate f/5 ratio. Exposure durations with the Lumicon Cassegrain Easy-Guider are thus 2 to 4 times shorter and the visual field-of-view is increased. The filter compartment is located behind the pick-off prism on the camera side of the Cassegrain Easy-Guider allowing you to guide off-axis with UNFILTERED starlight; only the camera's starlight is filtereda real bonus! All other off-axis guiders on the market have pick-off prisms only a fraction of the size of Lumicon's Cassegrain Easy-Guider and they require that the focal reducing lens AND filter be mounted AHEAD of the guider. This greatly dims fainter guide-stars making guiding on them all but impossible.

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