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Model: ApexED-LBrand: Starizona
Generally In Stock, Please Confirm Before Ordering
With the Apex ED reducer, an f/5.5 apo refractor becomes an incredibly fast f/3.6 astrograph. A slower f/9 telescope like an RC becomes a speedy f/5.9 system. The reduction factor provides a 1.5x wider field of view and shortens exposure times by a factor of 2.4x!
The Apex ED reducer features extra-low disperion glass to eliminate chromatic aberration and to provide sharp star images over a 30mm image circle, capable of working with most popular CCD, CMOS and DSLR cameras up to APS-C format.
The Apex ED reducer fits into a standard 2" focuser. It has M42 T-threads on the camera side, and it can accept a standard 2" (M48) filter on the telescope side for easy use of light-pollution or other filters. On Meade ACF telescopes, the Apex can be attached using a 2" visual back.
The "L" version is designed for telescopes with focal lengths 500mm and longer. This includes most larger (100mm+) refractors and all RC and ACF telescopes.
The nominal backfocus distance from the Apex ED reducer's T-threads to the image sensor depends slightly on the focal length of the telescope. It is at least 55mm in all configurations. The table below shows the optimum backfocus for various focal lengths. Please contact us for help in choosing the right adapters or spacers necessary for your setup.
Reduction Factor: 0.65xImage Circle: 30mmBackfocus: 55-62mm (depending on telescope focal length)Optical Design: 5 elements with ED glass, fully multi-coatedBarrel Diameter: 2"Camera Thread: M42 (T-thread)Filter Thread: M48 (2" filter)Overall Length (Apex ED L): 2.97"Weight (Apex ED L): 0.7 lbsOverall Length (Apex ED S): 3.26";Weight (Apex ED S): 0.72 lbs
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