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The 70mm f/5 Quadruplet ED APO Astrograph from Meade Instruments
is a purpose-built telescope for astrophotography and astro-imaging,
with an imaging circle designed to completely cover the larger sensors
of today's DSLR cameras. Optically it is designed with fully
multi-coated FPL-53 extremely low-dispersion (ED) glass in a quadruplet
apochromatic lens configuration that corrects for spherical and
chromatic aberrations, astigmatism, and off-axis comas. This correction
creates a wide flat field of view without distortion and removes the
blue-tinted "halo" affect for true high-contrast color transmission.
OTA can be used for multiple astrophotography techniques, with a 42mm
fully illuminated image circle that will cover a 35mm full frame sensor.
Meade utilizes a precise dual-speed rack-and-pinion focusing mechanism
that enables tack-sharp focusing with the ability to handle heavier
loads versus other systems, such as a Crayford. While the astrograph is
offered here without a mount or tripod for users that have a reliable
support system, a set of mounting rings and a Vixen-style dovetail plate
are included. For safe transport and storage, Meade includes a hard
aluminum carrying case with a custom-cut foam lining.