StarMax 90mm Mak-Cass Telescope and Tripod Bundle

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Orion StarMax 90mm Mak-Cass Telescope and Tripod Bundle

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The powerful Orion StarMax 90mm TableTop Maksutov-Cassegrain is now available with a field tripod very high-power 6.3mm eyepiece in this value-packed bundle!
Whether used on a table, or on the included tripod, the StarMax 90mm Maksutov-Cassegrain telescope will amaze you and your family with its sharp, high-power views of the cosmos
Observe the Moon in highly magnified detail, see bright planets in our solar system, survey sparkling star clusters, and view many bright nebulas under dark skies
Extremely lightweight at just 9.25 lbs. including the tripod, the StarMax 90mm Maksutov-Cassegrain and Tripod Bundle can be taken almost anywhere
Telescope and tripod bundle also includes three 1.25" telescope eyepieces: 25mm (for 50x power magnification), 10mm (for 125x power magnification), and a high-power 6.3mm (for 198x power magnification); an EZ Finder II aiming device, and more!

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Item # 27187

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Our pint-sized power performer StarMax 90mm Maksutov-Cassegrain and Tripod Bundle will provide you and your family with pleasing, high-power views of the heavens whether there's a sturdy table nearby or not!

This value-packed bundle includes a handy field tripod, which is adjustable with a height range of 20" to 34.5" so you can position the StarMax 90mm Maksutov-Cassegrain telescope comfortably for viewing without a table. The tripod also features an extendable elevator column for crowd-pleasing performance.

The Orion StarMax 90mm Maksutov-Cassegrain and Tripod Bundle also includes a high-power 6.3mm eyepiece, which provides a very powerful, 198x view in the 1250mm focal length 90mm Maksutov-Cassegrain telescope for high-magnification views of lunar crater details, bright planets, star clusters, and more. This ultra-compact Mak-Cass gives surprisingly big views for an instrument of its modest size, making it an elegant first telescope or a great grab-and-go second telescope!

The long, 1250mm (f/13.8) focal length gives the StarMax 90 TableTop some serious magnifying power - the included 25mm and 10mm 1.25" Super 3-element eyepieces yield powers of 50x and 125x, respectively. What's more, the included 6.3mm eyepiece provides a staggering 198x power view. The 90mm aperture Maksutov-Cassegrain collects over 25% more light than its GoScope 80 cousin, and up to 225% more light than a 60mm refractor telescope. So you'll be able to enjoy planetary delights such as Saturn's rings and Jupiter's moons, not to mention gorgeous high-power views of the Moon. As you scan the Milky Way, you'll also be able to pull in some open and globular star clusters, as well as a nebula or two.

An Orion EZ Finder II red-dot view finder, internal focuser (which moves the primary lens back and forth) and included 90� star diagonal round out the features of this compact, yet surprisingly capable, Maksutov-Cassegrain telescope.

Weighs 9.25 lbs. (including tripod, diagonal, eyepiece and finder).

Meets or exceeds all California State Environmental Quality & Safety Regulations (CARB 93120 Phase 2 Compliant).

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

Best for viewing

Lunar & planetary
Best for imaging

Lunar & planetary
User level

User level

Beginner - Suited for a wide range of uses, Level 1 telescopes are simple to operate and set up. Some initial assembly may be required. Very good optical and mechanical quality. Great for families, young people, and folks who don't want to mess with equipment but just want to take a look. Any of these scopes will show you countless lunar craters, Saturn's rings and a myriad of star clusters and nebulas! Referring to the manual is recommended.

Intermediate - These scopes offer higher performance and more advanced features than Level 1 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 - These scopes provide the best performance but may require more skill to master and appreciate. They have exceptionally fine optics and mechanics. Some are easy to use but are but on the large or heavy side. Some are intended for specialized uses. These scopes will appeal to the more technically inclined. Referring to the manual is highly recommended.

Expert - Expert telescopes offer uncompromising optical and mechanical quality for the most demanding amateur astronomer. They may be technically involved or designed for specialized use, such as astrophotography or detailed deep sky observation. They carry a premium price, but are designed to provide the ultimate performance in the field. Referring to the manual is highly recommended.

Beginner
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.

Maksutov-Cassegrain
Optical diameter

Optical diameter

The optical diameter (also known as aperture), is the size of the telescope's main light collecting lens or mirror, measured in millimeters or inches. As the diameter increases, more light is collected and the resolution increases.

90mm
Focal length

Focal length

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.

1250mm
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/13.9
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.

Spherical
Eyepieces

3-Element 25.0mm, 10.0mm
Magnification with included eyepieces

50x, 125x
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.

1.29arc*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.

13x
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.

180x
Highest theoretical magnification

212x
Limiting stellar magnitude

Limiting stellar magnitude

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

12.5
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

EZ Finder II
Focuser

Internal
Diagonal degrees

1.25" 90° Prism Star
Secondary mirror obstruction

29mm
Secondary mirror obstruction by area

10%
Mount type

Altazimuth
Polar-axis scope

Not available
Tube material

Aluminum
Tripod material

Aluminum
Tripod leg diameter

1.00 in.
Height range of mount

Height range of mount

The height range specification is a measure of the tripod itself - not the eyepiece height. Since telescopes come in all shapes and sizes, the eyepiece height will vary, even when using the same tripod. For an EQ tripod the mount is set up so the counterweight shaft is horizontal, and then the height is measured from the ground to the center of the mounting plate.

20.00 in. - 34.50 in.
Length of optical tube

10.0 in.
Weight, optical tube

3.7 lbs.
Weight, mount/tripod

5.7 lbs.
Weight, fully assembled

9.4 lbs.
Additional included accessories

6.3mm Orion E-Series Beginner Telescope Eyepiece
Warranty

One year

In the Box

OrionStarMax 90 TableTop Maksutov-Cassegrain Telescope
90� star diagonal
25mm telescope eyepiece
10mm telescope eyepiece
6.3mm telescope eyepiece
EZ Finder II reflex sight
3/8"-to-1/4"-20 threaded adapter for tripod attachment
Adjustable field tripod

Shipping Info

Orders received by noon Pacific Time for in-stock items ship the same business day. Orders 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: $15.00
2 Day Delivery: $15.00
Next Day Delivery: $21.00

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Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all.

Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. And you'll enjoy discount prices by buying your telescope online, direct from Orion. Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.

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At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. Visit the Orion Community Center for in-depth information on telescopes, binoculars, and astrophotography. You can find astrophotography "how to" tips and share your best astronomy pictures here. Submit astronomy articles, events, and reviews, and even become a featured Orion customer!

Why Buy From Orion

Beginner

User level

Optical design

Optical diameter

Focal length

Focal ratio

Optics type

Resolving power

Lowest useful magnification

Highest useful magnification

Limiting stellar magnitude

Optical quality

Height range of mount

Why Buy From Orion

Why Buy From Orion

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