Description
A thermally stable Zerodur ceramic mirror is also available as an option in place of the standard Pyrex mirror. As with any Pyrex mirror telescope, if the difference in temperature between indoors and outdoors is 30 degrees or more when a Questar is taken outside, minor refocusing will be required as its mirror contracts while cooling down to the outdoor air temperature. Some people find the need for even an occasional refocusing to be annoying. Since a Zerodur mirror exhibits virtually no expansion or contraction as temperatures change, this option eliminates this need for refocusing. This option is well worth considering due to the large thermal mass of the 7″ mirror and its consequently longer cool-down time than a smaller scope. I have both broadband coatings and a Zerodur mirror on my Questar Seven and can recommend them without reservation.
The Questar Seven Astro comes in a high impact ABS plastic sealed carrying case. A basic 35mm camera coupling set is also included (needs a Questar T-ring to connect to your camera).
This Questar is protected by a ten-year Questar warranty (two-year warranty on the focuser mechanism).
Absolutely pinpoint resolution, total freedom from spurious color and distortion, with an image clarity and contrast in a class all its own – a Questar is truly the Rolls-Royce of telescopes. For those individuals who appreciate the very finest that life has to offer, a Questar Seven Astro will prove to be an absolutely eye-opening revelation.
Tech Details:
| Aperture | 7″ |
|---|---|
| Binary and Star Cluster Observation | Very Good |
| Focal Length | 2400mm |
| Focal Ratio | f/13.4 |
| Galaxy and Nebula Observation | Good |
| Heaviest Single Component | 17 lbs. |
| Highest Useful Magnification | 362x |
| Lunar Observation | Great |
| Weight | 19 lbs. |
| Planetary Observation | Good |
| Resolution | 0.65 arc seconds |
| Visual Limiting Magnitude | 13.8 |
| Warranty | 10 years |
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