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Telescopes > Omegon Telescope AC 90/500 OTA
( 5 / 5 )
Product no.: 43767

Telescope AC 90/500 OTA

$ 299.00 incl. VAT, plus shipping costs
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Product description

Omegon 90mm guide scope - the all-in-one travel telescope and guide scope

The Omegon 90mm telescope is ideal for wide-view observing or for guiding using faint stars. When smaller guide scopes fail because there is no bright star in their field of view, the Skywatcher 90mm refractor comes into its own. But there is even more to this telescope.

For nature-watching and astronomy - 90mm aperture achromatic refractor

Its focal length of only 500mm makes this achromatic refractor telescope extremely compact. This lets you use it not only as a guide scope, but also on holiday as a travel telescope for wide-field observing. An interior baffle system and a multi-coating on the lens doublet ensure reflections are minimized. Observe with a 2" eyepiece at low magnification and experience fantastic views of the night sky and nature. With magnifications of up to a respectable 80X, you can also 'go into detail' with the telescope.

Refractor as guide scope

The 90/500mm achromat comes with a double ring clamp and an adapted prism rail receiver, allowing you to attach it to any refractor mount equipped with a GP receiver. Use a double mounting and a guide scope mount for astrophotography and everything is ready for your imaging. Another option is to mount your guide scope via an optional guide scope ring clamp.

Crayford focuser

This 90mm refractor has a 2" Crayford focuser for a precise and easy focusing. Use your 2" eyepieces for wide-field observing or the 1.25" reducer-adapter for all your 1.25" eyepieces.

Sturdy metal OTA

The 90mm refractor features a rugged metal OTA with a retractable dew shield. This not only has high quality looks, but also helps to protect the optics.

The advantages in a nutshell:

  • achromatic 90mm aperture refractor
  • suitable as guide scope and travel telescope
  • complete package, with guide scope rings

Specifications

Optics


Type
Refractor
Type of build
Achromat
Aperture (mm)
90
Focal length (mm)
500
Aperture ratio (f/)
5,5
Resolving capacity
1,15 (Rayleigh)
Limit value (mag)
12,2
Light gathering capacity
165
Max. useful magnification
80 (empfohlen)
Tube weight (kg)
2,2
Tube construction
Full tube

Focuser


Type of build
Crayford
Connection ( to eyepiece)
2
Backfocus (mm)
130mm (above 2")

Mount


GoTo control
no
Type of build
OTA
Mounting type
no mount

Included accessories


Tube clamps
yes
Carry case
yes
Eyepiece adaptor
1,25" & 2"

General


Special recommendation
yes

Area of application


Astrophotography
yes
Nature Observation
yes
Moon & Planets
yes
Nebulae & galaxies
not recommended
Sun
not recommended (Only with appropriate Sun filter)

Recommended for


Beginners
no
Advanced
yes
Observatories
no

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*All prices include VAT plus shipping costs.

Omegon Telescope AC 90/500 OTA
Omegon Telescope AC 90/500 OTA
Omegon Telescope AC 90/500 OTA
Omegon Telescope AC 90/500 OTA
Omegon Telescope AC 90/500 OTA
Omegon Telescope AC 90/500 OTA

Customer reviews

Real Bargain!

Review by M. N. on 21.12.2018 17:24:18

( 5 / 5 )

This scope is a real “sleeper”. Hard to imagine you can obtain this level of quality for $200 (US) and $10 S&H. The closest competitor is the Orion Short-tube 80 f/5 which is a very popular beginner grab-and-go scope, finder and guide-scope. The Orion Short-tube 80 mm weights 2.25 lbs. vs. 4.85 lbs. for the Omegon 90 mm.

So what makes this scope so special? For starters it is all metal, has a 90 mm (3.5 in.) aperture (same as the Questar), a very simple but functional Crayford focuser which will accommodate both 2 inch an 1.25 inch eyepieces. The focus travel is very generous (70 mm) and has nearly 3 times more focus travel than my $3,000 Takahashi! The objective comes with a retractable lens hood. The tube is white powder coated (?). Other premium items include: adjustable tube rings, mini Vixen style dove bar, metal focuser knobs, 2 internal metal baffles (to reduce stray light), flat black tube interior, metal black anodized screw on lens cap, fully multicoated air spaced Fraunhofer achromat objective, 500 mm focal length, and f/5.6 focal ratio (very fast for a refractor). This f/ratio makes this telescope an excellent visual telescope for wide field views of the Milky Way (what we used to call a RFT or richest field telescope).

The lens arrived in pristine condition without even a speck of dust on any of the 4 surfaces. The scope even comes with a light duty zippered case with carry strap. Initial optical tests showed hard diffraction disks at 80x, perfect collimation and no on-axis astigmatism. There is some spherical aberration which is to be expected However, this level of optical performance is hard to find in a fast f/ratio telescope below $800. The achilles heel for this telescope is the chromatic aberration (or secondary color). This creates a fringe of color (in this case bright yellow) around bright objects like the Moon, Venus and bright stars (i.e. Sirius). At higher magnifications >75x it also creates a pinkish-blue color veil over extended surfaces which tends to reduce some image contrast. When viewing at higher powers some may find the color objectionable. There are anti-fringing filters that can significantly reduce this aberration, however they do so by creating a color imbalance. In viewing the Moon at powers of 25x to 100x I was impressed with how quickly I was able to obtain a crisp focus. The view Aristharcus and the nearby rille was impressive!

Other minor complaints are the dove bar is really short making it necessary to loosen the tube ring assembly to balance the tube. The tube cannot be easily removed from the tube ring without removing the focuser (it is hinged). The tube rings are not lined with felt so be sure to not tighten it too much so as to avoid marring the paint. There is no provision for mounting a finder, but to be fair this scope doesn’t need a finder, since one of its functions is to serve as a finder! If you plan to use this scope as a visual telescope I would recommend a red dot finder such as the Rigel Systems. I have not yet evaluated the scope for terrestrial viewing, nor have I taken any digital images through it.

If you don’t mind the color at the higher magnifications this may be an excellent starter scope for wide field views of the night sky, observations of the major planets, Moon, and Sun (with proper filtration, of course). I haven’t had this much fun with a new telescope in many years! I highly recommend this telescope (for newbies and experienced amateur astronomers). Worst case, if your not happy with it you can pass it on to your kids or grandkids.

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