Orion Deluxe 100mm f/6.0 Refractor Guide Scope

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Orion Deluxe 100mm f/6.0 Refractor Guide Scope

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100mm (3.9") aperture, 600mm focal length refractor telescope optical tube gobbles up photons for pleasing wide-field performance
Perfect for use as a dedicated guide scope - easily resolves even faint guide stars
Deluxe 2" dual-speed Crayford focuser with linear track bearing for backlash-free precision focus, even with heavy guiding accessories attached
Lightweight f/6.0 refractor telescope tube weighs just 7.1 pounds, conveniently portable and easily added to an astrophotography setup
High quality rugged construction throughout

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Item # 07338

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The Orion Deluxe 100mm f/6.0 refractor OTA is a rugged achromat loaded with luxurious features, making it an excellent telescope for a wide variety of uses. The 100mm aperture optical tube is a light-gathering workhorse capable of providing pleasingly bright nighttime views of celestial objects. The Deluxe 100mm f/6.0 refractor could also be used as a first-rate guide scope for guided astrophotography pursuits with its significant 3.9-inch aperture and moderate focal length of 600mm. This telescope is ideal for targeting faint guide stars, which can be difficult to acquire in smaller aperture instruments.

The Deluxe 100mm OTA is outfitted with great features any visual or imaging enthusiast will appreciate. Fast f/6.0 optics provide detail-rich views with sharp clarity and resolution, especially on wide-field deep-sky objects or star fields. An extendable dew shield provides protection from unwanted peripheral glare and helps prevent dew buildup on the multi-coated objective lens. The extendable dew shield provides ample room for the attachment of tube rings or guide scope rings and the telescope optical tube features an integrated 1/4"-20 threaded mounting block for easy and convenient attachment to field tripods equipped with a 1/4"-20 threaded post for more casual use.

A robust 2-inch Crayford focuser provides dual-speed focus adjustment with 10:1 fine-focus control, meaning one turn of the coarse adjustment knob equals ten turns of the fine-focus knob. Such focus capability is a welcome luxury when scanning the heavens and landscape for subtle features and details, or for acquiring sharp focus on guide stars when used as a guide scope. What's more, the 2-inch focuser features a linear track bearing, which ensures stable and steady focus adjustment, even with heavy visual or imaging accessories attached. A 2-inch-to-1.25-inch eyepiece adapter is included to allow use of 1.25-inch eyepieces and accessories.

The fast focal ratio of the Orion Deluxe 100mm refractor makes it an excellent choice for use as a Guide Scope for guided astrophotography pursuits. Guide stars are easily obtained with the 3.9-inch aperture air-spaced doublet objective lens and the relatively wide field of view provided by the 600mm focal length. The luxurious dual-speed focuser enables you to fine-tune focus on guide stars so your guided astrophotos are of optimal quality.

Not limited to nighttime applications, the Deluxe 100mm f/6.0 can be used as a powerful daytime telescope as well. You'll be amazed at the clear and sharp views provided by this handy refractor during daylight hours. Adding an optional 45-degree correct-image diagonal provides correct daytime orientation of terrestrial subjects and landscapes.

With a weight of just 7.1 lbs and a tube length of 20.6-inches with the dew shield retracted, the Deluxe 100mm refractor is conveniently transportable for remote viewing or imaging sessions at dark sky sites.

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.

Warning

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Product Support

Visit our product support section for instruction manuals and more

Specs

User level

User level

Beginner Level - Suited for a wide range of uses, these products are simple to operate and set up. Some initial assembly may be required depending on the type of product. Optical instruments with this rating will have very good optical and mechanical quality. Great for families, young people, and folks who don't want to mess with equipment and complexity. Beginning level telescopes will show you countless lunar craters, Saturn's rings and a myriad of star clusters and nebulae! Referring to the manual is recommended.

Intermediate Level - These products offer higher performance and more advanced features than Level 1: Beginner models. They typically take a bit longer to learn and need some set-up or adjustments. But anyone with the slightest technical bent will have no problem getting familiar with these models. Referring to the manual is recommended.

Advanced Level - These products provide the best performance but may require more skill to master and appreciate. Optical instruments with this rating have exceptionally fine optics and mechanics. Some are easy to use but might be on the large or heavy side. Some are intended for specialized uses. These products will appeal to the more technically inclined. Referring to the manual is highly recommended.

Intermediate
Optical design

Optical design

Reflector telescopes use a pair of large and small mirrors to direct incoming light to the eyepiece. Refractor telescopes refract, or "bend" incoming light to a focus by means of an objective lens. Cassegrain telescopes, such as Maksutov-Cassegrains, "fold" incoming light using two mirrors and a front "corrector" lens.

Refractor
Optical diameter

Optical diameter

For telescopes, the optical diameter (also known as aperture) is the size of a telescope's main light-collecting lens or primary mirror, measured in millimeters or inches. Telescopes with larger optical diameters collect more light, which leads to an increase in brightness and image resolution compared to smaller instruments.

For binoculars, the optical diameter (also known as objective lens diameter) is the size of each of the front-facing objective lenses of a binocular measured in millimeters. Binoculars with larger objective lenses collect more light, which increases image resolution and brightness. Binoculars with larger objective lenses are recommended for low light situations, and binoculars with at least 50mm or larger objective lenses are recommended for pleasing astronomical observations at night.

100mm
Focal length

Focal length

The distance from the center of a curved mirror or lens at which parallel light rays converge to a single point. The focal length is an inherent specification of a mirror or lens and is one of the factors in determining resultant magnification for a telescope (along with the focal length of the eyepiece being used).

600mm
Focal ratio

Focal ratio

The focal ratio of an optical system is the ratio of a telescope's focal length to its aperture. Short focal ratios (f/5, f/4.5) produce wide fields of view and small image scales, while long focal lengths produce narrower fields of views and larger image scales.

f/6.0
Coatings

Coatings

Binocular lenses and prisms are often coated with anti-reflective material to minimize light loss as light travels through the multiple optical surfaces of a typical binocular. Coatings help maximize the amount of light transmitted through each glass surface of a binocular, so as much light as possible reaches the observer's eyes to provide a bright and sharp image.
Good lenses are at least "fully coated," with a single layer of magnesium fluoride coating applied to each air-to-glass lens surface. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more air-to-glass lens surface has multiple coatings. "Fully multi-coated" optics are even better, meaning all lens surfaces have multiple layers of anti-reflective coatings applied for maximum light transmission and optimal image quality.

Multi-coated
Optics type

Optics type

Newtonian reflectors will have either a spherical shaped mirror, which is less expensive to produce, or a higher quality parabola, which does not result in spherical aberration. Cassegrain telescopes routinely use spheres in addition to other lenses in the optical path to correct for residual spherical aberration. Refractors use a series of lenses to provide a clear image. Designs range from a standard air-spaced doublet (two lenses in a row) to exotic designs such as oil-spaced triplets and 4-element multi group lenses.

Air-spaced doublet
Glass material

Glass material

Refractors use glass lenses to focus the light, and the glass material plays an important role in the quality of the resulting image. Standard achromatic refractors routinely use Crown and Flint for the two elements, but more expensive apochromatic refractors can use ED (extra low dispersion) glass for one or more of the lenses. Reflector mirrors are made from glass with different levels of thermal expansion. Standard mirrors are made from material such as Soda-Lime Plate glass and BK-7 glass. Glass with Pyrex or other low thermal expansion material will not change shape as dramatically during the cool-down period, resulting in more stable images during this period.

Crown/Flint
Eyepieces

None
Resolving power

Resolving power

The theoretical resolving power of a telescope can be calculated with the following formula: Resolving power (in arc seconds) = 4.56 divided by aperture of telescope (in inches). In metric units, this is: Resolving power (in arc seconds) = 116 divided by aperture of telescope (in millimeters). Note that the formula is independent of the telescope type or model, and is based only upon the aperture of the telescope. So the larger the telescope's aperture, the more it is capable of resolving. This is important to keep in mind when observing astronomical objects which require high resolution for best viewing, such as planets and double stars. However, it is usually atmospheric seeing conditions (not the telescope) which limits the actual resolving power on a given night; rarely is resolution less than one arc-second possible from even the best viewing locations on Earth.

1.16arc*sec
Lowest useful magnification

Lowest useful magnification

Lowest useful magnification is the power at which the exit pupil becomes 7mm in diameter. Powers below this can still be reached with the telescope to give wider fields of view, but the image no longer becomes brighter at a lower power. This is due to the fact that the exit pupil of the telescope (the beam of light exiting the eyepiece) is now larger than the average person's dark adapted pupil, and no more light can fit into the eye.

14x
Highest useful magnification

Highest useful magnification

The highest practical limit is different from the often used "highest theoretical magnification" specification. The "theoretical" limit generally is 50x the aperture of the scope in inches (2x the aperture in mm). So for example, an 80mm refractor is capable of 160x, and a 10" telescope is theoretically capable of 500x magnification. But after approximately 300x, theory breaks down and real world problems take over. The atmosphere above us is constantly in motion, and it will distort the image seen through the telescope. This effect may not be noticeable at lower powers, but at higher powers the atmosphere will dramatically blur the object, reducing the quality of the image. On a good night (a night where the air above is steady and the stars aren't twinkling), the practical upper limit of a large telescope is 300x, even thought the theoretical limit may be much higher. This doesn't mean the scope will never be able to reach those higher "theoretical" powers - there will be that rare night where the atmosphere is perfectly still and the scope can be pushed past it's practical limit, but those nights will be few and far between.

200x
Highest theoretical magnification

200x
Limiting stellar magnitude

Limiting stellar magnitude

The limiting stellar magnitude is a measure of the faintest star you can see through the telescope.

12.7
Optical quality

Optical quality

"Diffraction Limited" means that the limits of image detail are determined by the physical properties of light, and not by optical defects in the telescope.

Diffraction Limited
Finder scope

None
Focuser

2" dual-speed linear bearing Crayford
Mount type

Optical Tube without Mount
Astro-imaging capability

Astro-imaging capability

The astro-photographic capability of the telescope is based on the style, stability, and accuracy of the mount and tripod. Telescopes on either very lightweight mounts or non tracking mounts (such as Dobsonians) are capable of only very short exposures such as lunar photographs. If a motor drive is attached to an equatorial mount, even a small lightweight mount is capable of capturing some planetary detail. Larger EQ mounts that utilize very precise tracking and excellent stability are capable of longer exposure deep-sky photography.

Lunar, planetary & long exposure
Tube material

Aluminum
Length of optical tube

20.6 in.
Weight, optical tube

7.1 lbs.
Additional included accessories

Dovetail base for finder, 1.25" adapter
Other features

Retractable dew shield, Narrow dovetail with 1/4"-20 threaded hole, Rotatable focuser
Warranty

Warranty

This warranty gives you specific legal rights. It is not intended to remove or restrict your other legal rights under applicable local consumer law; your state or national statutory consumer rights governing the sale of consumer goods remain fully applicable.

One year

In The Box

Deluxe 100mm f/6.0 refractor Optical Tube Assembly (OTA)

Shipping Info

Orders received by 1pm Eastern Standard Time for in-stock item the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
3 Day Delivery: $9.00
2 Day Delivery: $9.00
Next Day Delivery: $13.00

SHIPPING RESTRICTIONS APPLY FOR THIS PRODUCT

This product is available to ship Standard delivery within the 50 US states, APO/DPO/FPO addresses and US territories/protectorates. Delivery is not available to Canada.

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