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User Manual for Sky-Watcher 90mm f 14 Maksutov-Cassegrain Telescope Click to enlarge the picture
Contents of the user manual for the Sky-Watcher 90mm f 14 Maksutov-Cassegrain Telescope
- Product category: Catadioptrics (Cassegrains) Sky-Watcher
- Brand: Sky-Watcher
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Sky-Watcher Catadioptrics (Cassegrains)
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User manual for the Sky-Watcher 90mm f 14 Maksutov-Cassegrain Telescope contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Sky-Watcher product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Sky-Watcher user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Sky-Watcher product will considerably shorten its lifespan!
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Product description Similar to their Schmidt cousins, this 90mm f/14 Maksutov-Cassegrain Telescope from Sky-Watcher exchanges the conventional front corrector plate with a convex meniscus lens, which results in a smaller secondary mirror. This limits obstruction and increases contrast, while eliminating the need for periodic collimation. The Maksutov optical path results in a slower focal ratio and narrower field of view versus a similar Schmidt, but the optical benefits make this an ideal scope for planetary and double-star observation.The scope is outfitted with a 1.25" visual back. To get users started, Sky-Watcher includes 10 and 25mm eyepieces that produce low and moderate magnifications and a 90° star diagonal for more comfortable viewing when the optical tube assembly (OTA) is pointed at or near the celestial zenith. The OTA is offered here without a mount or tripod for users who have a platform or want to use it as part of a dual-OTA setup for star parties or observation/imaging rigs. It is outfitted with a Vixen-style dovetail plate for easy attachment onto many mounts. This OTA's compact form factor belies its observation power and resolution and is ideally suited as a grab-and-go option for quick observation sessions or heading out to remote locations. - Optical Performance
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- 90mm aperture
- f/14 focal ratio
- 1250mm focal length
- Front convex meniscus lens corrects spherical and chromatic aberrations and comas (off-axis aberrations) across the entire field of view
- Smaller secondary mirror versus Schmidt-Cassegrains reduces obstructions and increases contrast
- Fully multi-coated optics maximize light transmission to improve brightness, color rendition, sharpness, and contrast
- Resolution: 1.3 arcsec
- Internal primary mirror focus
- 1.25"-diameter visual back takes 1.25" eyepieces and accessories
- Mounting
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- Requires user-supplied mount and tripod
- Vixen-style dovetail plate
- Weight: 3.6 pounds including OTA, dovetail plate, finder, diagonal, and eyepiece
- Included Accessories
- Eyepieces:
- 1.25" barrel diameter
- Accept most 1.25" astronomical filters
- 25mm eyepiece yields 50x power
- 10mm eyepiece produces 125x magnification
Diagonal:- 1.25" snout and eyepiece holder
- 90° angle places head in a comfortable viewing position
- Star configuration corrects image horizontally for terrestrial use
Finderscope:- Unmagnified view provides a wide field of view for easier alignment and faster star-hopping navigation
- Red center aiming dot won't obstruct objects
- Variable intensity to preserve night-adjusted vision
UPC: 050234115001 In the Box Sky-Watcher 90mm f/14 Maksutov-Cassegrain Telescope (OTA Only) 90° Star Diagonal 25mm Eyepiece 10mm Eyepiece Red Dot Finderscope Limited 2-Year Warranty Table of Contents
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Technical parametersSky-Watcher S11500 Specs | Optical Design | Maksutov-Cassegrain | | Aperture | 3.5" / 90mm | | Focal Length | 1250mm | | Focal Ratio | f/13.8 | | Eyepiece Barrel Diameter | 1.25" | | Diagonal | 90° star | | Finderscope | Red dot | | Tripod | None | | Mount Type | Vixen-style dovetail plate | | Power Source | N/A | | Optical Tube Dimensions | Not specified by manufacturer | | Weight | 3.6 lb / 1.6 kg | | | | Package Weight | 8.35 lb | | Box Dimensions (LxWxH) | 22.4 x 10.1 x 9.8" |
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