SKU: 83456296785

Sky-Watcher ProED 100mm f/9 Doublet APO Refractor (OTA only)

$90771.75 $100857.50
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Description

Sky-Watcher ProED 100mm f/9 Doublet APO Refractor (OTA only)100mm Apochromatic Refractor 900mm Focal Length, f 9 Focal Ratio Proprietary MHC Multicoated Optics Schott BK 7 and FPL 53 ED Glass 2" Crayford Focuser with 1. 25" Adapter 20mm and 5mm Eyepieces, 90 Diagonal 8x50 RA Erect Image Finderscope Vixen Style Dovetail Plate & Cradle Ring Foam Lined Aluminum Carrying Case The ProED 100mm f 9 Doublet APO Refractor from Sky Watcher features a doublet apochromatic lens system with Extra low Dispersion (ED) glass

  • 100mm Apochromatic Refractor
  • 900mm Focal Length, f/9 Focal Ratio
  • Proprietary MHC Multicoated Optics
  • Schott BK-7 and FPL-53 ED Glass
  • 2" Crayford Focuser with 1.25" Adapter
  • 20mm and 5mm Eyepieces, 90° Diagonal
  • 8x50 RA Erect-Image Finderscope
  • Vixen-Style Dovetail Plate & Cradle-Ring
  • Foam-Lined Aluminum Carrying Case

The ProED 100mm f/9 Doublet APO Refractor from Sky-Watcher features a doublet apochromatic lens system with Extra-low Dispersion (ED) glass and Sky-Watcher's proprietary photon anti-rejection Metallic High-Transmission Coatings (MHC) on all air-to-glass optical surfaces. This combination of glass, lenses, and coatings virtually eliminates chromatic aberrations for clear and bright high-contrast images with true color rendition. This is a versatile optical tube assembly (OTA) that is well suited for wide-field astronomical observation of prominent nebulae, star clusters and galaxies, or can be used as an astrograph for sky photography, a terrestrial spotting scope or telephoto lens. The aperture of this 100mm model of the ProED not only increases image brightness over the smaller 80mm version, it improves resolution and contrast.

A mounting cradle-ring clamps over OTA and allows the user to adjust the orientation and position of the scope relative to the mount to optimize viewing comfort and balance, while avoiding interference with other equipment. The scope is offered without a mount or tripod, but a Vixen-style dovetail plate makes it compatible with any alt-az or equatorial mount with a Vixen-style saddle.

Its two-speed Crayford-style focuser helps make fine-focusing fast and precise without backlash. The ProED comes with several accessories to help you get observing faster and easier. First, are two long eye relief eyepieces that produce 30 and 120x magnification, a 90° star diagonal for more comfortable viewing, and a large 8x50 erect-image finderscope to make finding your celestial objects faster and easier. Finally, Sky-Watcher provides a foam-lined aluminum carrying case to safely store and transport the OTA.

Optical Performance
  • 100mm objective lens
  • 900mm focal length
  • Focal ratio: f/9
  • Refractor-style optical design
  • Extra-low Dispersion (ED) glass
  • Apochromatic doublet lenses eliminate chromatic aberrations for true color rendition and enhanced contrast
  • Proprietary anti-reflection Metallic High-Transmission Coatings (MHC) multicoatings on all optics
  • Bbjective lens cell is light-baffled to reject stray, unfocused light
  • Baffled draw tube for enhanced contrast
  • OTA interior is flat blackened to help prevent unfocused internal light reflections from reaching the focal plane
  • Resolution, Rayleigh: 1.39 arc sec
  • Resolution, Dawes: 1.16 arc sec
Focuser
  • 2" diameter focuser
  • Dual-speed Crayford-style
  • Crayford focusers use a toothless friction system that allows for super-fine precision focusing without backlash
  • Includes 1.25" adapter for using smaller eyepieces and accessories
Included Accessories
  • Two 1.25" barrel diameter eyepieces:
    • 5mm eyepiece: Yields 180x magnification
    • 20mm eyepiece: Yields 45x magnification
  • Diagonal:
    • 90° angle
    • Dielectric coatings for greater than 99% reflectivity
    • Star diagonal corrects images vertically, but not horizontally
  • 8x50 erect-image finderscope with bracket
  • Foam-lined hard aluminum carrying case
Mount
  • User-supplied mount and tripod required
  • Vixen-style dovetail plate included
  • Compatible with any alt-az or equatorial mount with a Vixen-style saddle
  • Cradle-ring assembly for plate allows the scope orientation to be changed based on mount configuration
  • Integrated 1/4"-20 piggy-back camera mount for wide-field astrophotography
  • Quick-release system for fast setup and breakdown
UPC: 812556011238
Optical Design Apochromatic Refractor
Aperture 3.9" / 100 mm
Focal Length 900 mm
Focal Ratio f/9
Eyepiece Barrel Diameter 2"
1.25" with included adapter
Diagonal 90° Star
Finderscope 8x50 erect-image
Tripod None
Mount Type Vixen-style dovetail
Length 36.2" / 92.0 cm
Weight 10.0 lb / 4.5 kg
Packaging Info
Package Weight 28.8 lb
Box Dimensions (LxWxH) 41.0 x 16.0 x 11.0"
In the Box
Sky-Watcher ProED 100mm f/9 Doublet APO Refractor (OTA only)
  • 5mm Eyepiece
  • 20mm Eyepiece
  • 2" 90&Deg; Diagonal
  • 1.25" Eyepiece Adapter
  • 8x50 Finderscope with Bracket
  • Mounting Plate and Cradle Ring Assembly
  • Foam-Lined Aluminum Carrying Case
  • Limited 2-Year Warranty
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 83456296785

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Iowa Mama
New York, US
★★★★★ 4
This was a Good gift for the right person
Format: Paperback
My nephew wanted a similar book- this had better reviews and I heard about lots of things that he’d done with this book. Glad I got it
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Reviewed in the United States on April 27, 2025
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Ian
Alexandria, US
★★★★★ 5
From the creator of the Godot Recipes site!
Format: Paperback
Absolutely loved this, takes you through building 5 different games from start to finish, and explains not only how to do things, but it also explains the why! Throughout the course of making these 5 games, you also get introduced to many of the Nodes within Godot, explanations on how they are used, and gives you some experience using them! Feels good to add more tools into your toolkit as you become more familiar and comfortable using more Nodes. Even though this book is not intended for beginners, I would still recommend this book. It comes with a link where you can download example files and get going with minimal effort, however to get the most out of the book I would try to recreate stuff yourself. I found it very useful for easing myself into trying out 3D development. I've been doing 2D for years, and am currently developing a 2D game in Godot, once I complete that I'll be diving headfirst into 3D and this book gave me a lot of insight, and I feel much better about the whole process.
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Reviewed in the United States on August 12, 2023
M
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Momx4
Draper, US
★★★★★ 5
Just what a gamer needs!
Format: Paperback
Perfect gift for my son!
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Reviewed in the United States on May 26, 2015
M
Mick Charles Beaver
Lexington, US
★★★★★ 2
would have been better as a blog
Format: Paperback
First off, I have read over half of this book, but ultimately decided to put it down because it had a low signal-to-noise ratio. If the second half is filled with magic, I apologize in advance. What I liked: * The author is very honest. He does not shy away from discussing his failures (and successes). * The postmortem on the game "Life of Pixel" was especially good. * Interviews from various indie studios are sprinkled throughout. What I did not like: * A number of pieces of information were already out-of-date. This makes me think that the concepts should have been discussed at a higher level. For example, specifics about game engine costs are discussed. These numbers have changed since E3 of this year. Definitely recheck any information before formulating a plan based on the book's recommendations. * The indie studio interviews are a wasted opportunity in that they each interview has the same set of questions. It's like a questionnaire was sent out via email and the responses were pasted into the book. * When discussing commercial options, such as engines or other software packages, blurbs once again appear to be cut-and-pasted (this time verbatim from the package's web site). * Some of the advice is too broad and too light. For example, when writing about how to create a press release, the author discuss how to write in the active voice. I'm frankly not looking for writing tips in my Indie Game Developer Handbook. * The book is filled with tons of web links. My paperback copy was not so useful here. I ultimately left the book with the impression that the information would have been much better in the form of a blog. The author could have really gone in depth with the parts of the book that shined while keeping the surveys of topics in a form that serves them better (i.e. web links on the web).
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Reviewed in the United States on April 28, 2015
M
Verified Purchase
Meridian
Lowell, US
★★★★★ 5
Helpful information and Questions to consider
Format: Paperback
As a writer of science fiction and fantasy I had already looked into the physical aspects of the worlds I was creating, but I quickly realized I needed to include society and culture in the worldbuilding. I started a search for information, questionairres, or guidelines to use and found very little that would be helpful to me as a writer. Until I came across this book. It's exactly what I needed. It touches on multiple aspects of beliefs and practices and asks questions to help you think through what you want for your worlds, even if it's mostly backgroud. A very useful tool.
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Reviewed in the United States on May 26, 2024

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