FOR THE BEGINNING OBSERVER the ETX-90AT may be all the telescope ever required. For the advanced astronomer who may own a larger instrument, the ETX-90AT is the perfect ultraportable, diffraction-limited field telescope.
Includes! #497 Autostar Controller: The patented Meade Autostar controller brings automatic GO TO operation, plus dozens of additional menu options, to your fingertips, with a database of more than 30,000 celestial objects, including 5,386 galaxies, nebulae and star clusters from the Index Catalog (IC); 7,840 objects from the New General Catalog (NGC); 110 Messier objects; the major planets from Mercury to Pluto; and more. Purchased separately, the #497 Autostar sells for $149.
Includes! #884 Deluxe Field Tripod: Constructed of strong, lightweight steel, the full-length Meade #884 Deluxe Field Tripod provides a rigid mounting platform for virtually any ETX observing application. Purchased separately, the #884 Deluxe Field Tripod sells for $199.95.
SPECIFICATIONS:
Maksutov-Cassegrain optical tube assembly (D = 90mm, F =1250mm, f/13.8) with EMC super multi-coatings; internal flip-mirror system for either straight-through or 90° observing position; fork mount with electric slow-motion controls, setting circles and locks on both axes; electronic control panel; 4-speed (8x, 32x, 0.75°/sec, 5°/sec) dual-axis motor drive system with hand controller; sidereal-rate tracking in equatorial mode; internal battery compartment for eight (user-supplied) “AA” size batteries; 8 x 21mm erect-image viewfinder; Series 4000 Super Plössl 26mm eyepiece (1.25"); operating instructions. Weight 9 lbs. (with controller and batteries).
The Meade UHTC Group: The importance of the UHTC group becomes apparent when comparing total telescope light transmission, or throughput, caused by the multiplier, or compounding, effect of the four optical surfaces. With each optical surface contributing significantly to telescope light throughput, the effect of all four surfaces combined is indeed dramatic. At the H-a wavelength of 656nm, total transmission increases from 76.7% to 88.5%, an increase of 15.4%; at the helium wavelengths of 588nm and 469nm — strong emission lines in hot planetary nebulae — total telescope transmission increases by 13.8% and 16.8%, respectively; at the two nitrogen II lines of 655nm and 658nm and at the sulfur II line of 673nm, transmission is increased by 16%. Averaged over the entire visible spectrum (450nm to 700nm), total light transmission to the telescope focus increases by about 15%.
Observing with the UHTC: Meade ETX, Schmidt-Cassegrain, and Schmidt-Newtonian telescopes equipped with the UHTC present dramatically brighter images on the full range of celestial objects — from emission and planetary nebulae such as M8, M20, and M57 to star clusters and galaxies such as M3, M13, and M101. Observations of the Moon and planets, since they are observed in reflected (white) sunlight, benefit in image brightness from the full spectrum of increased transmission.
The overall effect of the UHTC is, as it relates to image brightness, to increase the telescope's effective aperture. Image brightness of the Meade 10" LX200GPS is, for example, effectively increased by about 0.75 inch of aperture.
FREE GROUND/SURFACE SHIPPING IN THE 50 UNITED STATES. PLEASE CALL FOR OTHER METHODS OF SHIPPING.
|
