Explore Scientific 152mm f/4.8 Comet Hunter OTA and Accessories
The David H. Levy Comet Hunter is a rich field telescope (RFT), capable of showing faint objects over a wide field of view (generally two degrees or more). Explore Scientific has co-designed a Maksutov-Newtonian telescope with comet hunter and author David Levy that can help support the Sharing the Sky Foundation through the sale of this telescope. The Comet Hunter comes standard with a two-inch, 30mm focal length eyepiece with a wide 70° apparent field. This eyepiece combined with the short focal length of the telescope produce an amazing 2.86° true field of view with a 6.2mm exit pupil. Each Comet Hunter special edition telescope will come with a certificate signed by David Levy. Mount and tripod are not included.
- Clear Aperture: 152mm
- Secondary Obstruction:49mm; 32% Obstruction
- Resolving Power:.77 arc seconds
- Focal Length: 731mm
- Focal Ratio: f/4.8
- Primary Mirror Diameter: 152mm
- Secondary Mirror Diameter (M.A.): 46mm
- Coatings: EMD™ (Enhanced Multilayer Deposition)
- Limiting Stellar Magnitude: 13.4
- Maximum Practical Visual Power: 360x
- Lowest Useful Visual Power: 22.8x
- Focuser: Ten-to-One 2-Speed Crayford-Style, with Adjustable Tension and Lock
- Cradle: Dual Clamp-Ring Style with Built-In Handle
- Saddle Plate: One-Piece Machined Aluminum Extrusion; Fits Explore Scientific Mounts; Vixen Mounts; Meade LXD55/75 Mounts
- Tube Diameter: 180mm
- Tube Length: 696mm
- Tube Construction: Carbon Fiber; Aluminum; Stainless Steel
- Optical Tube Assembly Weight: 15.4 lbs.
Levy has spent a lifetime advising people to help them find their first serious telescope, and inspiring people of all ages to look at the stars through his comet discoveries, his writings, and his lectures. His dream to show people the beauty of the night sky has culminated in the formation of a non-profit organization devoted to outreach in astronomy, called the Sharing the Sky Foundation.
Explore Scientific shares David's dream, and we wanted to help. So we embarked on a project to co-design a telescope with Levy that could be perfect for beginner and expert alike. In addition we decided to provide the Sharing the Sky Foundation a portion of the sales of each telescope.
Called the David H. Levy Comet Hunter™, the instrument is a rich field telescope (RFT), capable of showing faint objects over a wide field of view (generally two degrees or more).
Explore Scientific's challenge was to design a portable instrument that has enough aperture to observe the broad range of celestial objects with an optimized optical design to serve as a true RFT that can also work well for high magnification observations of planets. We also wanted the telescope to serve as a serious optical solution for astroimaging. In short, we wanted a telescope that could do almost anything; a telescope that would be perfect for beginners to advanced astronomers alike.
To match the performance of the main instrument itself, Explore Scientific chose deluxe accessories as standard equipment.
Producing a bright right-side-up, left-to-right correct image, the 8x50 Correct-Image Illuminated Finder Scopea> has a precision glass-etched illuminated reticle of the has a cross-hair to mark the field boundaries and an open circle in the middle so that stars can be perfectly centered without being covered.
The Comet Hunter comes standard with a two-inch, two-speed focuser, and a 30mm focal length eyepiece with a wide 70° apparent field. This eyepiece combined with the short focal length of the telescope produce an amazing 2.86° true field of view with a 6.2mm exit pupil.
Sometimes called visual equalization magnfication, using the right low power eyepiece eyepiece will produce an exit pupil that nearly matches the fully dialated eye. This allows you to see to the faintest observable limit of the telescope's aperture, which is critical for searching for faint objects such as distant comets.
When you design and manufacture a telescope, there are lots of ways that you can attempt to reduce cost in order to hit a desired price point. While we do our best to keep prices reasonable, our philosophy is that we should make every Explore Scientific telescope perform for the astronomer and for everyone that the instrument is shared with.
Although it cost more, Explore Scientific chose carbon fiber for the telescope tube and dew shield for its high strength-to-weight ratio and its low expansion characteristics when subjected to temperature variations. This helps to keep the instrument light in weight and keeps the instrument focused even if the temperature drops.
The dew shield of the Comet Hunter is removeable, but can be left on all the time since the metal dust cover fits on the dew shield or on the optical tube assembly alone.
No matter what your observing environment is like, a dew shield serves to protect. It protects against dew forming on the corrector plate (which will make the stars slowly vanish), it protects the mirrors from stray light which will reduce contrast, and it also can provide physical protection to the corrector plate.
Explore Scientific understands that the aquisition of a precision instrument represents an important investment to its owner. That is why every Comet Hunter is supplied with heavy-duty, custom-cut, foam lined instrument case. The case uses four butterfly latches so that the lid can be complete removed for easy access to the items inside. The bottom of the case has rubber feet to lift the case off the ground to keep the case clean and dry.
All Explore Scientific telescopes are covered under their standard U.S.A. One Year Limited Warranty against defects with proof of purchase, but you can extend this limited warranty to five years by simply filling out the product registration and mailing it to Explore Scientific within 60 days. This program is also available to the person who receives your gift of an Explore Scientific telescope. You don't need to give them the purchase receipt, just remind them to fill out the registration and mail it to Explore Scientific and they will take care of the rest.
|Name||Explore Scientific - 152mm f/4.8 Comet Hunter OTA with Deluxe Case and Accessories|
|Warranty||Explore STAR Transferrable Unlimited Lifetime Product Warranty|