Brand: Orion Telescopes USD

Orion 8" f/4 Newtonian Reflector Astrograph (replaces 8297) (09505)

09505

Brand: Orion Telescopes USD

Orion 8" f/4 Newtonian Reflector Astrograph (replaces 8297) (09505)

09505

Its big 8" aperture and fast f/4.0 focal ratio allow the capture of faint galaxies and nebulas with short photographic exposure times - and for a fraction of the price that a premium "apo" refractor even half its size would cost.
  • Affordable 8"-class Newtonian telescope optimized for wide-field astrophotography
  • The 200mm (7.9") aperture f/4 parabolic primary mirror is made from high-quality BK7 glass with enhanced aluminum coatings to provide >92% reflectivity for bright, vivid images
  • Its short focal length and big aperture let you capture more light from deep-sky objects in less time, greatly improving your imaging efficiency
  • Compact and lightweight at just 28" long and 16 lbs., can be supported on a mid-sized mount such as the Orion Atlas II EQ-G
  • Includes 8x50 finder scope, hinged tube rings, 12V DC cooling accelerator fan, and a quick-collimation cap. A coma corrector (sold separately) is recommended for optimal flat-field performance.
$1,028.95 CAD

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Product Description

In keeping with our philosophy of offering great astrophotographic gear at affordable prices, check out our 8" f/4.0 Newtonian Reflector Astrograph. For wide field, deep-space imaging performance, this telescope has few rivals. Its big 8" aperture and fast f/4.0 focal ratio allow the capture of faint galaxies and nebulas with short photographic exposure times - and for a fraction of the price that a premium "apo" refractor even half its size would cost.

The Orion 8" f/4.0 Newtonian Reflector Astrograph is perfect for intermediate-level astrophotographers, and a great second telescope for more advanced imagers who want more portability, without sacrificing quality. It excels for capturing bright, detailed images with CCD or DSLR cameras. As with any fast Newtonian reflector, an optional coma corrector is recommended to achieve the sharpest images. With an optional eyepiece, this telescope doubles as a fine visual instrument for studying deep-space wonders.

Weighing only 16 lbs. and just 28" long, this instrument is easily supported on a mid-sized equatorial mount, like our Atlas II EQ-G. The 200mm-aperture parabolic primary mirror is made from low-thermal-expansion BK7 optical glass. Enhanced aluminum mirror coatings with 92% to 95% reflectivity deliver more light to the focuser. A cooling accelerator fan is included on the primary mirror cell for rapid temperature equilibration, to ensure stable images.

We outfitted this telescope with a machined 2" dual-speed (10:1) Crayford focuser that incorporates a linear-track bearing. This advanced focuser design provides superior camera support and eliminates drawtube flexure. Backfocus distance is 83.2mm from the 2" collar. Standard accessories include a pair of hinged tube rings, 8x50 finder scope, 2" extension adapter for visual use, and a quick-collimation cap.

Great telescopes for astrophotography don't have to cost thousands! Get the Orion 8" f/4.0 Newtonian Reflector Astrograph today.

Warranty note: 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 800-447-1001.

What can I see with a Orion 8" f/4 Newtonian Reflector Astrograph (replaces 8297) (09505)?

Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.

Jupiter with

25mm Eyepiece - 32x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 80x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 160x Magnification

Sold Separately

Moon with 25mm Eyepiece

32x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

80x Magnification

Sold Separately

Moon with 5mm Eyepiece

160x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

22x Magnification

Sold Separately

Andromeda with 25mm Eyepiece

32x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

80x Magnification

Sold Separately

What's in the Box

  • Orion 8" f/4 optical tube assembly
  • 8x50 finder scope and bracket
  • 12V cooling fan (installed)
  • Pair of tube rings
  • 2" extension adapter (35mm length)
  • Quick-collimation cap
  • Vixen-style dovetail mounting bar
  • 2.5mm and 5mm Allen wrenches

Specifications

Best for viewing Fainter deep sky
Best for imaging Deep sky
User level Advanced
Optical design Reflector
Optical diameter 200mm
Focal length 800mm
Focal ratio f/4.0
Optics type Parabolic
Glass material BK-7
Eyepieces None
Resolving power 0.58arc*sec
Lowest useful magnification 29x
Highest useful magnification 300x
Highest theoretical magnification 400x
Limiting stellar magnitude 14.2
Finder scope 8x50
Focuser 2" dual-speed linear bearing Crayford
Secondary mirror obstruction 70mm
Secondary mirror obstruction by diameter 35%
Secondary mirror obstruction by area 12%
Mirror coatings/over-coatings Aluminum & Silicon Dioxide
Mount type Optical Tube without Mount
Astro-imaging capability Lunar, planetary & long exposure
Backfocus distance 83.2mm
Tube material Steel
Length of optical tube 27.5 in.
Weight, optical tube 16.0 lbs.
Additional included accessories
  • 12V cooling fan with battery pack (req. 8 AA)
  • Pair of hinged, felt-lined tube rings
  • 2" extension tube for visual use
Other features
  • Center-marked primary mirror for collimation
Warranty One year

Customer Reviews

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A
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Not for beginners

Cons:

- Expensive for what you get.
- Collimation needs to be perfect at F4. Star collimation skills or
autocollimator required along with a cheshire/site tube to align secondary.
- Scope needs many modifications out of the box to be useable for imaging
- Replace springs in primary mirror cell with thicker ones
- Replace spring in secondary mirror with a thicker one
- Add ball bearing with some tape wrapped around it to the non-fine focus
side of the focuser to prevent the rod from applying uneven pressure to
the focuser. Mine slipped like crazy with my imaging gear on it even
tightening the thumb **** as much as I could.
- 3D printed mirror mask is nice to remove diffraction patterns on stars
from the mirror clips, but optional
- Washer between the back of the secondary mirror and the collimation
screws of the spider.
- Washers around the thumb screws for the spider to prevent the tube
dimpling when tightened. These need to be quite tight to ensure the
collimation doesn't drift.
- Mine had a manufacturer defect in the focuser plate on arrival
- Focuser is not compatible with EAF. 3D printed parts required along with
different metric bolts to make this work along with the above modification
to prevent slipping.
- Warranty response is slow. I had to escalate my case a few times prior to
getting proper attention on it.
- Bolt was loose in the box from dovetail upon recieving it
- Focuser slips with a camera on it. Over tightening can turn into cracked
focuser as critical parts are made of plastic.
- Out of the box collimation drifts from the weight of the secondary mirror
(See modifications required)
- You'll want a good coma corrector if imaging with this. Don't skimp on this
as the better ones are worth the extra cash. So add another $500 - $600 on
this price for one

Pros:

- Once modifications have been made and focuser has been modified or replaced the optics are amazing
- F4 is quite fast so integration time and subs can be less
- Newtonian price per aperture size can't be beat. Though you'll want to ensure you have good enough seeing to take advantage
- The fan on the back of the primary is great to get to ambient temps and also
prevent dew.

This is a tinkerers telescope. If you want to invest a little more on top and are comfortable making modifications then this scope is a good challenge and it has the potential for amazing results. Otherwise stick to a refractor.

Another note if you source parts from China or want easier access to 3D printed models Skywatcher might be a better way to go. Seems there's a lot more out there for those scopes than Orion/GSO.

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