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Meade 16" Lx200-Acf Advanced Coma-Free Telescope With Uhtc Coatings, 24mm Series 5000 Eyepiece Save 41% Brand Meade

มี Meade 16" Lx200-Acf Advanced Coma-Free Telescope With Uhtc Coatings, 24mm Series 5000 Eyepiece Save 41% Brand Meade ให้เลือกมากมาย นานัปการแนว แบ่งเป็น Meade 16" Lx200-Acf Advanced Coma-Free Telescope With Uhtc Coatings, 24mm Series 5000 Eyepiece Save 41% Brand Meade สำหรับคุณสุภาพบุรุษ และ Meade 16" Lx200-Acf Advanced Coma-Free Telescope With Uhtc Coatings, 24mm Series 5000 Eyepiece Save 41% Brand Meade สำหรับคุณผู้หญิง อย่างแจ่มแจ้ง ทำให้ง่ายแล้วก็สบายเป็นอย่างมากสำหรับในการเลือกช้อปปิ้ง เรา

Content:
  1. Meade 16" Lx200-Acf Advanced Coma-Free Telescope With Uhtc Coatings, 24mm Series 5000 Eyepiece Save 41% Brand Meade.
  2. Explore Scientific Ed80 Classic White Air Spaced Triplet, 480mm Focal Lengthcoupon Available Save 55% Brand Explore Scientific.
  3. Sky Watcher 10in. Flextube 250p Collapsible Dobsonian Telescope S11720instant Rebate Save 15% Brand Sky Watcher.
  4. Sky Watcher 20in Stargate Truss-Tube Goto Dobsonian Telescopeinstant Rebate Brand Sky Watcher.
  5. Opticron Mm3 60 Ga/45 Travelscope + Hdf T 15-45x Travelscope Kitnewly Added Save 13% Brand Opticron.
  6. Explore Scientific 16in/406mm Truss Tube Dobsonian Telescopefree Gift Available Save 55% Brand Explore Scientific.
  7. Celestron Edgehd 925 9.25" Optical Tube Assembly 91040-Xlt, Ota Telescopefree Gift Available Save 40% Brand Celestron.
  8. Sky Watcher Esprit 80mm Ed Triplet Apo Refractor Telescope S11400free Gift Available Brand Sky Watcher.

Meade 16" Lx200-Acf Advanced Coma-Free Telescope With Uhtc Coatings, 24mm Series 5000 Eyepiece Save 41% Brand Meade.

Product Description

Product Info for Meade 16" LX200-ACF Advanced Coma-Free Telescope with UHTC Coatings, 24mm Series 5000 Eyepiece

The Meade 16" LX200 ACF UHTC Advanced Coma Free GoTo GPS Telescope is a Hubble for your Backyard! Meade LX200 ACF Telescopes bring Advanced Coma Free optics within reach of aspiring astronomers everywhere. Now with Meade 16" LX200ACF Computerized Telescope you can own what the professionals own. Meade LX200-ACF Telescopes Advanced Coma-Free GOTO Telescopes include all the field-proven features of the Meade LX200 and Meade LX200GPS Telescopes, including GPS, LNT, Primary Mirror Lock, Zero Image-Shift Microfocuser, Oversized Primary Mirror, SmartDrive, Smart Mount, Meade AutoAlign, Meade AutoStar II and more. Plus, all Meade LX 200 ACF Series Telescopes come with observatory-class optics and Meade Series 5000 26mm 5-Element Plossl Eyepieces.

Specifications for Meade LX200ACF 16" Advanced Coma-Free GPS Telescope with Meade UHTC:

Optical Design: Advanced Coma Free
Clear Aperture: 406.4mm
Focal Length Focal Ratio: 4064mm; f/10
Maximum Practical Visual Power: 950X
Telescope Mounting: Heavy-duty fork type; double-tine
Primary Mirror Lock: included (progressive tension)
Viewfinder: 8 x 50mm
GPS, True-level and North sensors: included (16-channel GPS receiver)
Pointing Precision, High Precision Mode: 1-arc min.
Meade Autostar II Hand Controller: included (147,541 object database)
Tracking Rates: sidereal, lunar, or custom-selected from 2000 incremental rates
Primary, Secondary Mirrors: Pyrex glass
Correcting Plate/Lens: water white glass
Total Net Telescope Weight: 318 lbs.
Field Tripod Height all models: 40" to 50" variable

Features of Meade LX200-ACF Telescopes with UHTC:

  • Advanced Coma-Free Optics: Meade Advanced Comafree design is a huge jump over the traditional Schmidt-Cassegrain as far as sharpness of image, flatness of field, and color. Meade Advanced Coma Free Telescopes delivers the same sharp, flat, comafree field from edge to edge as a typical Ritchey-Chretien. The use of the corrector plate in the Meade ACF system creates a closed and protected optical tube, reduces astigmatism and eliminates the diffraction spikes inherent in the traditional RC design. ACF optical systems perform at the same high level as comparable RC systems costing thousands more.
  • Meade UHTC Ultra-High Transmission Coatings: increases total light transmission and image brightness by nearly 20% over standard coatings. Objects such as stars, galaxies and nebulae will appear significantly brighter.
  • Zero Image Shift Microfocuser: allows you to obtain precise image focus with no image movement.
  • Primary Mirror Lock: locks the mirror in place during long exposure astro photography.
  • Oversize Primary Mirror: diameters are greater than their listed aperture. This additional 1/4" yields a wide, fully illuminated field-of-view.
  • Meade Smart Mount: constantly refines pointing accuracy each time an object is centered and updated. Compatible with both equatorial and altazimuth mounts.
  • Meade Smart Drive: provides permanent periodic error correction (PPEC) on both axes by learning and averaging error over the course of one or more training periods, thereby minimizing guiding corrections during long-exposure photographs. PPEC is available on both axes and functions in both polar and altazimuth modes.
  • Sony GPS Receiver Sensor: automatically inputs precise time, date, and geographical location to help quickly and precisely align a LX200-ACF Meade Telescope.
  • Meade AutoAlign: Telescopes with Meade Auto Align come pre-aligned. They are smart scopes that know the night sky right out of the box. Meade AutoAlign picks two fail-proof alignment stars for you and places them right in your view-finder. Just center them to fine tune your alignment and the wonders of the universe are at your fingertips.
  • Meade AutoStar II Hand Controller: features Hot Keys for quick access to a 145,000 celestial object database. Meade Auto Star II can be updated with the latest software upgrades, guided tours and timely objects like comets.

Package Contents:

  • Meade 16 inch LX200 ACF UHTC Advanced Coma-Free Telescope:
  • Meade LX 200 ACF 16" Advanced Coma-Free Telescope with Meade UHTC Coatings
  • Heavy Duty Double-Tine Fork Mount
  • AutoStar II Hand Controller
  • Sony GPS Receiver
  • AutoStar Suite Astronomer Edition Software
  • Meade Series 5000 26mm 1.25" Plossl Eyepiece
  • Diagonal Prism
  • 8 x 50mm Finder Scope

Explore Scientific Ed80 Classic White Air Spaced Triplet, 480mm Focal Lengthcoupon Available Save 55% Brand Explore Scientific.

Product Description

Product Info for Explore Scientific ED80 Classic White Air Spaced Triplet, 480mm Focal Length

Explore Scientific ED80 Classic White f/6 Air Spaced Triplet with Hoya FCD100 optics and Integrated Dew Shield; 480mm focal length; 2.5" HEXagonal Rack and Pinion 10:1 two-speed Focuser; Integrated Vixen-Style Dovetail, Explore Finder Scope Base installed on scope; 99% Reflective 2" Diagonal. Dew shield diameter: 122mm. Weighs 7lbs. (Case and Finder Scope NOT Included).

Specifications for Explore Scientific ED80 Classic White Air Spaced Triplet, 480mm Focal Length:

Additional Features: Dovetail - Vixen
Focal Length: 480 mm
Focal Ratio: f/6

Package Contents:

  • Explore Scientific ED80 Classic White Air Spaced Triplet, 480mm Focal Length

Sky Watcher 10in. Flextube 250p Collapsible Dobsonian Telescope S11720instant Rebate Save 15% Brand Sky Watcher.

Product Description

Product Info for Sky Watcher 10in. Flextube 250P Collapsible Dobsonian Telescope S11720

The Sky Watcher 10in. Flextube 250P Collapsible Dobsonian Telescope is a big, friendly horse of a telescope you can ride off into the sunset with, and then thrill to well resolved celestial views when twilight fades. The SW 10" DOB is an very satisfying telescope to own, an instrument that will provide a lifetime of continuing exploration of the heavens. This telescope will hit the sweet-spot for many amateurs, providing all the capability and value you are seeking in a large aperture telescope. Sky-Watcher's revolutionary truss-support concept allows the optical tube's front and back cells to collapse together, aligning on the truss support rods which can then be locked down for easy and secure telescope transport. This one piece, low-hassle OTA design is mechanically simple and results in a large aperture telescope that can be reasonably handled and transported by one individual. This innovation gives Sky-Watcher users tremendous functional ease-of-transportability. There is no question the incremental resolving power of a 10-inch aperture is visually impressive when compared to an 8-inch. Therefore, it is no wonder then that the 10" aperture is overtaking the 8" as the serious amateur astronomer's aperture of choice in a Dobsonian telescope. Sky-Watcher's compact, collapsible optical tube design makes the decision to step up in aperture to a 10" even easier. The Sky-Watcher 10" DOB Telescope utilizes quality components throughout. Pride of workmanship manifests itself in high quality standards of optical and mechanical fabrication. The polishing process for primary and diagonal mirror yields smooth mirror surfaces ensuring good contrast, and properly corrected optics show minimum alterations to the optical wave-front. On each parabolic primary mirror, and elliptical diagonal mirror aluminum is vacuum deposited to the front glass surface and then over coated with hard quartz (SiO4). Additional layers of Titanium Dioxide (TiO2) and (SiO4) are then applied. The mechanical and structural components of the OTA exhibit rigid construction and outstanding stability. The mount construction is sturdy and rigid. Mount design, while simple, facilitates smooth motions about both axes. Quality accessories enhance the observer's viewing experience. Observing with a Dobsonian has been described akin to shooting ducks in a gallery because it is so easy to find your target. Just swing your Sky Watcher 10in. Flextube 250P Collapsible Dobsonian Telescope to the quadrant of sky to be searched, and scan the vicinity. An 8x50mm Right Angle optical viewfinder provides both magnification and light gathering to help narrow your search for those elusive fuzzies when star-hopping. The standard-equipment backlash-free 2" Crayford Focuser insures ultra smooth focusing adjustments. Multi-coated, 4-element Plossl eyepieces (25mm and 10mm) provide a spacious 52mm Apparent Field of View. To ensure mechanical ease-of-use, SW uses a high-performance Teflon bearing system in both axes combined with tension adjustment in altitude to facilitate setting the appropriate amount of friction, assuring smooth vertical and horizontal manual movement without free-play from small bumps or gusts of wind. This also eliminates the need to have a balanced optical tube as in an equatorial mount. Sky-Watcher's Teflon bearing system is preferable to the use of ball-bearings. Ball-bearings make unintended movement of the optical tube more difficult to control. Fortunately, at low power, deep-space objects leisurely drift through the field of the SW 10" DOB, so constant mechanical adjustment of the telescope's orientation isn't needed to keep objects in the field of view. For an amazing way to be sure you are using one of the best scopes the observation industry has to offer, choose the Sky Watcher 10in. Flextube 250P Collapsible Dobsonian Telescope.

Specifications for Sky Watcher 10in. Flextube 250P Collapsible Dobsonian Telescope:

Optical Design: Newtonian Reflector
Aperture (mm): 254 mm (10 in)
Focal Length: 1200 mm (47 in)
Focal Ratio: 4.72
Focal Length of Eyepiece 1 (mm): 25 mm (0.98 in)
Magnification of Eyepiece 1: 48 x
Focal Length of Eyepiece 2 (mm): 10 mm (0.39 in)
Magnification of Eyepiece 2: 120 x
Finderscope: 8x50 RA Viewfinder
Mount Type: Dobsonian
Highest Useful Magnification: 600 x
Lowest Useful Magnification: 36 x
Limiting Stellar Magnitude: 14.5
Resolution (Rayleigh): 0.55 arc seconds
Resolution (Dawes): 0.46 arc seconds
Light Gathering Power (Compared to human eye): 1317 x
Optical Tube Weight: 33 lbs (15 kg)

Features ofSky Watcher 10in. Flextube 250P Collapsible Dobsonian Telescope:

  • 10" (254 mm) Dobsonian-style Newtonian
  • 1200 mm focal length (f/5)
  • 2" Crayford-style focuser with 1.25" adapter
  • 4-element Plossl 25 mm and 10 mm 1.25" eyepieces
  • 8x50 right angle erect-image finderscope
  • Solid rocker-mount with Teflon bearings and tension clutch for altitude
  • Teflon bearing for azimuth
  • Eyepiece height at zenith: 48"

Package Contents:

  • Sky Watcher 10in. Flextube 250P Collapsible Dobsonian Telescope
  • Finder Scope

Sky Watcher 20in Stargate Truss-Tube Goto Dobsonian Telescopeinstant Rebate Brand Sky Watcher.

Product Description

Product Info for Sky Watcher 20in Stargate Truss-Tube GoTo Dobsonian Telescope

Sky-Watcher brings to you the ultimate DOB experience with the StarGate 18 Dobsonian! Given its remarkable light gathering power, you will be able to catch the most subtle night sky features with your naked eyes. The sturdy giant is reasonably light (110Lb) despite its dimensions, and being easily assembled (30-minute setup time), the whole scope boasts remarkable transportability. If you have the appetite for exceptional planetary and deep space observation, then don't miss out on this high-quality Newtonian system.

PARABOLIC PRIMARY MIRRORS

Features High-Quality Parabolic Primary Mirrors to eliminate spherical aberrations inherent in 'fast' focal length reflectors with spherical primary mirrors. The mirrors are parabolized to bring all the light rays to the same focal point to give sharp, contrasty images, which are full of detail.

SKY-WATCHER DELUXE MIRROR COATINGS

Most reflectors today usually have a coat of aluminum as the mirror surface and then an overcoat of silicon monoxide or silicon dioxide to protect it. Silicon dioxide produces a much more durable coat than silicon monoxide but requires specialized equipment to apply it and is, therefore, more expensive. Protection is needed, because, in most reflectors, the mirror is open to the elements and deterioration of the reflective layer reduces the resolution of the telescope. ALL Sky-Watcher reflectors are Multi-Coated with Silicon Dioxide as a standard for Optimum Durability and Long Term Performance.

Specifications for Sky Watcher 20in Stargate Truss-Tube GoTo Dobsonian Telescope:

Included Accessories: 28mm LET eyepiece and 10mm eyepiece, 2.3lbs counter weights (3), Shroud, Truss clamps
Magnification: 72 - 1000 x
Objective Aperture: 508 mm
Focal Length: 2000 mm
Focal Ratio: 3.95
Color: Black

Features of Sky Watcher 20in Stargate Truss-Tube GoTo Dobsonian Telescope:

  • Fused conical primary mirror
  • Cellular secondary mirror
  • Dual speed 2 Crayford focuser
  • Two section truss poles (compact transport)
  • Minimalist
  • all metal construction
  • Fast f/3.95 optics for short eyepiece heights
  • 20 provides 56% more light than a 16 telescope
  • 94% reflectivity coatings
  • Freedom Find
  • dual encoders
  • SynScan with 42,000+ object database

Package Contents:

  • Sky Watcher 20in Stargate Truss-Tube GoTo Dobsonian Telescope

Opticron Mm3 60 Ga/45 Travelscope + Hdf T 15-45x Travelscope Kitnewly Added Save 13% Brand Opticron.

Product Description

Product Info for Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit

Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit is a dynamic tool that is sure to help you reach past the stars. These Telescopes will give top-of-the-line reflecting, refracting or catadioptric optics that are just right for you. With out-of-this-world components, like sophisticated magnification power and a quick light gathering functionality, Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit delivers one of the best astronomy experiences in the universe. Opticron is an industry leader that has been known to soar above the rest, when it comes to offering the high quality that just about every science enthusiast is looking, far and wide, for. At OpticsPlanet, we ensure that you will find some of the best optical instruments for your buck, and Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit guarantees many years of top-notch overall performance and dependability. For an remarkable way to be assured that you have made the very best choice in viewing the stars and beyond, don't be afraid to get the Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit.

Specifications for Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit:

Magnification: 15 - 45 x
Finish: Black
Objective Lens Diameter: 60 mm
Color: Black
Optical Coating: Fully Multi-Coated

Package Contents:

  • Opticron MM3 60 GA/45 Travelscope + HDF T 15-45x Travelscope Kit

Explore Scientific 16in/406mm Truss Tube Dobsonian Telescopefree Gift Available Save 55% Brand Explore Scientific.

Product Description

Product Info for Explore Scientific 16in/406mm Truss Tube Dobsonian Telescope

Explore Scientific 16" (406mm) Truss Tube Dobsonian. 1826mm Focal length f/4.5. 2" two-speed focuser with 10:1 speeds. Deluxe Red-dot finder. Two large radial fans for fast thermal equilibrium. Lightweight and portable two-piece design allows the primary objective to store in a unique self contained aluminum housing with a lid for transport and the secondary fits inside the aluminum rocker box. Primary mirror inside mirror box weighs 52.5 lbs. Primary, secondary and truss tube assembly weighs 66.1 lbs. Rocker box weighs 22 lbs. Total weight 88.1 lbs.

Package Contents:

  • Explore Scientific 16in/406mm Truss Tube Dobsonian Telescope

Celestron Edgehd 925 9.25" Optical Tube Assembly 91040-Xlt, Ota Telescopefree Gift Available Save 40% Brand Celestron.

Product Description

Product Info for Celestron EdgeHD 925 9.25" Optical Tube Assembly 91040-XLT, OTA Telescope

The Celestron EdgeHD 925 9.25" Optical Tube Assembly 91040-XLT is available for use with your favorite mount. This 9.25 inch Optical Tube Assembly (OTA) is made to the same exacting standards as those used on all high quality Celestron Telescopes. All optical surfaces are coated with Celestron 's high efficiency StarBright multi-layered coating group. The OTA is equipped with the same dovetail mounting bar used on the CGE and Advanced Series for easy attachment to a variety of popular mounts. Every tube assembly is made, assembled and quality control tested at the Celestron manufacturing facility in Torrance, California.

These Edge HD 9.25-inch Optical Tube Assemblies feature an optical system that takes all of the compact power popularized by the Schmidt Cassegrain Telescope (SCT) and combines it with an improved High Definition Optical System for wide field, astrograph quality images. As a visual instrument, EdgeHD optics deliver pinpoint images even with your widest field eyepiece. You can search for all of the Messier Catalog objects, and see hundreds of other equally interesting NGC, IC and Caldwell objects with amazing clarity. For astroimaging, the EdgeHD optics produce aberration-free images across your favorite CCD or DSLR camera. All EdgeHD optics on the telescope are designed to produce an extremely flat focal plane precise enough to match the strict tolerances of the largest commercial ccd detectors, allowing all stars to be in tight focus to the very edge of the chip. The EdgeHD 9.25" optics produces a focal plane almost 9 times flatter than the standard equivalent SCT telescope with diffraction limited stars across the entire Nikon D3 or Canon 5D field of view!

In addition to Celestron 's new optimized optical design, the EdgeHD 9.25in OTA has been redesigned to make sure you get the most from your optics each and every night. Among them include:

  • Mirror Support - Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around the mount. The flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror assembly, keeping the image centered in the eyepiece (or chip).
  • Tube Vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 60 micron micro-mesh filter guaranteed to let warm air out without letting dust in.
  • Fastar Versatility -The EdgeHD are the most versatile imaging scopes available today. At its native f10 you can achieve the image scale necessary to capture the smallest of deep sky objects. With the optional reducer lens (coming soon) you can increase your field of view without sacrificing optical performance. A barlow gives you the added power for high resolution planetary, lunar and solar imaging. And of course all EdgeHD optical tubes are Fastar compatible for ultra fast f/2 wide field imaging. Each tube has been fitted with a removable secondary mirror and are opto-mechanically aligned on a laser bench to ensure they are axially symmetric in any configuration.
  • Easy Collimation - With precision machined mechanics and a spherical secondary mirror, EdgeHD optics can be collimated accurately and easily to guarantee that they perform to their potential every time you use them.

Specifications for Celestron EdgeHD 925 9.25" Optical Tube Assembly 91040XLT:

Optical Design: Aplanatic Schmidt
Aperture: 234.95 mm (9.25 in)
Focal Length: 2350 mm (92.52 in)
Focal Ratio: 10
Finderscope: 9x50
Optical Tube: Aluminum
Eyepiece 1: 23 mm (0.91 in)
Magnification 1: 102 x
Star Diagonal: 2" w/ 1.25" adapter
Optical Coatings: StarBright XLT Secondary
Mirror Obstruction: 3.35 in (85.09 mm)
Secondary Mirror Obstruction by Area: 13.1 %
Secondary Mirror Obstruction by Diameter: 36.2 %
Optical Tube Length: 22 in (558.8 mm)
Optical Tube Weight: 21 lb (9.53 kg)
Dovetail Compatibility: CGE Mount

Features of Celestron EdgeHD 925 9.25" Optical Tube Assembly 91040 XLT:

  • 9.25" EdgeHD Optical Tube Assembly
  • Aluminum Optical Tube
  • Celestron's premium StarBright XLT coatings
  • 2350mm focal length (f/10)
  • 23mm Axiom 2" eyepiece included (102x)
  • 9x50 finderscope to help accurately find objects
  • 2" diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • Mirror Support Knobs hold the mirror in place and reduces image shift during imaging
  • Tube vents with integrated 60 micron mesh filter allowing hot air to be released from behind the primary mirror
  • Fastar Compatible optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging
  • Includes dovetail rail compatible with CGE mount

Package Contents:

  • Celestron EdgeHD 925 9.25" Optical Tube Assembly 91040-XLT
  • 23 mm eyepiece (102x)
  • 9x50 finderscope
  • dovetail rail

Sky Watcher Esprit 80mm Ed Triplet Apo Refractor Telescope S11400free Gift Available Brand Sky Watcher.

Product Description

Product Info for Sky Watcher Esprit 80mm ED Triplet APO Refractor Telescope S11400

Sky Watcher Esprit 80mm ED Triplet APO Refractor Telescope S11400 automates the process of locating astronomical points of interest. With 80mm of light gathering resolution, this Telescope from Sky Watcher can supply bright images, and with quality eyepieces and a 900mm focal length, there is plenty of magnifying power. The Grade-A Crown and Flint glass yields pristine, high-contrast images of Saturn's rings, Jupiter's cloud belts, and wall-rimmed craters on the Moon by the hundreds. The Sky Watcher Esprit 80mm ED Triplet APO Refractor has a library of 4000 celestial objects, so just punch-in the object you want to observe and SynScan guides your Sky Watcher Esprit ED Triplet APO Refractor Telescope into position for viewing.

Specifications for Sky-Watcher Esprit 80mm ED Triplet APO Refractor:

OTA Weight: 8.8lbs.
OTA Length: 17.375" (fixed dew shield)
Back focus: 75mm
Optical Design: Refractor
Field Flattener: Included, thread-on
Aperture (mm): 80 mm (3.15 in)
Focal Length: 400 mm
Focal Ratio: 5
Highest Useful Magnification: 120 x
Optical Coatings: Fully multi-coated

Features of Sky Watcher Esprit 80mm ED Triplet APO Refractor Telescope w/ Fully Multicoated Lens:

  • 80 mm apochromatic 3-element refractor
  • 400 mm (f/5)
  • Fully multi-coated
  • Thread-on field flattener
  • 2.7" focuser w/micro focus
  • 2" Diagonal with dielectric coatings
  • 9x50 RA erect-image finderscope
  • Canon camera adapter
  • Tube rings with CG5 style dovetail bar
  • Aluminum foam lined case
  • 33mm image circle

Package Contents:

  • Sky Watcher Esprit 80mm ED Triplet APO Refractor Telescope with Helinear Track