Telescope Nerd » Sizes » 8-inch Telescopes (203mm)

8-inch Telescopes (203mm)

8-inch telescopes are basically for amateur astronomers. Overall, they provide 800-2415 mm focal lengths, and a range of focal ratios from f/4-f/11.5. They offer twice the light-gathering power of a 4″ telescope. 8-inch telescopes allow magnification up to 300-480x. You can get 8-inch telescopes from different brands in the price range of 570-5,000$.

What is an 8-inch telescope?

An 8-inch telescope refers to a telescope having an aperture (the diameter of the objective lens) of 8-inch (203 mm). An 8-inch telescope is considered to be in the category of a medium telescope. 

What can you see with an 8-inch telescope?

  • The Moon and its craters 
  • Jupiter with its cloud belts, and the Great Red Spot. Jupiter’s moons in ruddy orange-yellow color. 
  • Saturn and its bands, the Cassini Division, and its largest moon-Titan.
  • Uranus and Neptune are as an azure disk
  • Galaxies like M74 and M83, Whirlpool Galaxy, M51 B/NGC 5195, M81 and M82 in Ursa Major
  • The Virgo Cluster 
  • Globular star clusters like M2, M3, M5, M13, M15, and M92.
  • Nebulae like the Ring and Dumbbell, the Blinking Planetary Nebula, and NGC 7027 in Cygnus.

Types and Technical Specifications of 8-inch telescopes

Types (Optical Design)

Newtonian: Example: Meade 8″ f/4 LX85 Astrograph Reflector Optical Tube, Meade 8″ f/4 LX85 Astrograph Reflector Telescope, Starfield f/4 Imaging Newtonian – 8″, Celestron Starsense Explorer 8″ Dobsonian Smartphone Telescope, Orion 8″ f/4 Newtonian Reflector Astrograph, TPO 8″ f/4 Newtonian Reflecting OTA Telescope.

Cassegrain: Example: Meade 8″ f/10 LX85 ACF Telescope with Mount and Tripod, Meade 8″ f/10 LX85 ACF Optical Tube Assembly.

RASA: Example: Celestron RASA 8″ Telescope w/ AVX Mount Bundle – CE-12032, Celestron CGX 8-Inch RASA Telescope Package, Celestron RASA 8″ Telescope w/ Computerized CGEM-II Mount Bundle – CE-12020, Celestron RASA 8″ f/2 OTA.

Modified SCT: Example:Meade LX200-ACF 8″ f/10 Telescope – without Tripod, Celestron CGX 800 EdgeHD Telescope Bundle – CE-12055, Celestron NexStar Evolution 8″ EdgeHD with StarSense, Celestron 8″ EdgeHD Advanced VX Telescope Bundle – CE-12031, Meade 8″ LX200-ACF f/10 OTA Only w/ UHTC, Meade 8″ ACF LX90 Telescope, Celestron CPC Deluxe 800 EdgeHD Telescope.

Ritchey Chretien: Example: Orion 8″ f/8 Ritchey Chretien Reflecting OTA Telescope, TPO 8″ f/8 Ritchey Chretien Steel Astrograph with TPO 2″ Focuser, iOptron Photron 200 RC OTA,TPO 8″ Carbon Fiber f/8 Ritchey Chretien Reflecting OTA Telescope.

Dobsonian: Example: Orion SkyQuest XT8 Classic Dobsonian Telescope Kit, Sky-Watcher Classic 200P f/5.9 Dobsonian Telescope, Sky-Watcher Flextube 200P f/5.9 8″ Dobsonian, Orion SkyQuest XT8 Classic Dobsonian Telescope, Sky-Watcher 8″ GoTo Collapsible Dobsonian Telescope.

SCT: Example: Celestron CGEM II· 800 Schmidt-Cassegrain Telescope – CE- 12010, Celestron CGX 800 Computerized Telescope, Celestron Advanced VX 8″ Schmidt-Cassegrain Telescope Bundle – CE-12026, Celestron CPC 800 GPS (XLT) Computerized Telescope Bundle – CE-11073-XLT, Celestron C· 8 -A XLT CGE Optical Tube Assembly, Celestron NexStar Evolution 8″ Computerized Telescope, Celestron NexStar 8SE Computerized Telescope.

Dall Kirkham: Example: Takahashi Mewlon-210 f/11.5 Dall Kirkham Reflecting OTA Telescope.

Technical Specifications

Aperture: 8-inch (203 mm)

Focal Length: 800-2415 mm 

Focal ratio: f/4-f/11.5

Highest Magnification: 300-480

Light Gathering Power: 816-900x

Price: 570-5,000$

Images taken with 8-inch telescopes

Examples of 8-inch telescopes

  • Meade 8″ f/4 LX85 Astrograph Reflector Optical Tube
  • Meade 8″ f/10 LX85 ACF Telescope with Mount and Tripod
  • Meade 8″ f/4 LX85 Astrograph Reflector Telescope
  • Starfield f/4 Imaging Newtonian – 8″
  • Celestron RASA 8″ Telescope w/ AVX Mount Bundle – CE-12032
  • Celestron CGX 8-Inch RASA Telescope Package
  • Celestron RASA 8″ f/2 OTA
  • Meade LX200-ACF 8″ f/10 Telescope – without Tripod
  • Orion 8″ f/8 Ritchey Chretien Reflecting OTA Telescope
  • Orion SkyQuest XT8 Classic Dobsonian Telescope Kit
  • Celestron CGEM-II 800 EdgeHD Telescope – CE-12017
  • Celestron CGEM II· 800 Schmidt-Cassegrain Telescope – CE- 12010
  • Celestron CGX 800 Computerized Telescope
  • Celestron CGX 800 EdgeHD Telescope Bundle – CE-12055
  • Celestron NexStar Evolution 8″ EdgeHD with StarSense
  • Sky-Watcher Classic 200P f/5.9 Dobsonian Telescope
  • TPO 8″ f/8 Ritchey Chretien Steel Astrograph with TPO 2″ Focuser
  • Celestron 8″ EdgeHD Advanced VX Telescope Bundle – CE-12031
  • Celestron Advanced VX 8″ Schmidt-Cassegrain Telescope Bundle – CE-12026
  • Sky-Watcher Flextube 200P f/5.9 8″ Dobsonian Telescope
  • SKU : SW-S11700
  • Celestron CPC 800 GPS (XLT) Computerized Telescope Bundle – CE-11073-XLT
  • Orion SkyQuest XT8 Classic Dobsonian Telescope
  • Meade 8″ f/10 LX85 ACF Optical Tube Assembly
  • Celestron Starsense Explorer 8″ Dobsonian Smartphone Telescope
  • Orion 8″ f/4 Newtonian Reflector Astrograph
  • iOptron Photron 200 RC OTA
  • Sky-Watcher 8″ GoTo Collapsible Dobsonian Telescope
  • TPO 8″ Carbon Fiber f/8 Ritchey Chretien Reflecting OTA Telescope
  • Takahashi Mewlon-210 f/11.5 Dall Kirkham Reflecting OTA Telescope
  • Celestron C· 8 -A XLT CGE Optical Tube Assembly
  • Meade 8″ LX200-ACF f/10 OTA Only w/ UHTC
  • TPO 8″ f/4 Newtonian Reflecting OTA Telescope
  • Meade 8″ ACF LX90 Telescope
  • Celestron CPC Deluxe 800 EdgeHD Telescope
  • Celestron NexStar Evolution 8″ Computerized Telescope
  • Celestron NexStar 8SE Computerized Telescope

How do 8-inch telescopes compare to other size telescopes

8-inch vs 9.25-inch telescope

8-inch telescopes provide a focal length of 800-2415 mm with a focal ratio of f/4-f/11.5. In contrast, 9.25-inch telescopes vary from  2350-2500 mm in focal length with a focal ratio of f/10. However, the price of the 9.25-inch scope is three times that of the 8-inch scope. Moreover, 9.25-inch telescopes provide 406-555x highest magnification, which is 300-480x in the case of 8-inch telescopes.

8-inch telescope9.25-inch telescope
Aperture8-inch (203 mm)9.25-inch (235 mm)
Focal Ratiof/4-f/11.5f/10
Focal Length800-2415 mm2350-2500 mm
Highest Magnification300-480x406-555x
Price570-5,000$1,899-8,320$

8-inch vs 10-inch telescope

8-inch telescopes have less aperture than the 10-inch telescopes. They offer a focal ratio of f/3.9-f/10 whereas the 8-inch telescopes provide  f/4-f/11.5. Besides, 8-inch telescopes offer a focal length of 800-2415 mm whereas the 10-inch telescopes vary from 1000-2500 mm in focal lengths.

8-inch telescope10-inch telescope
Aperture8-inch (203 mm)10-inch (254 mm)
Focal Ratiof/4-f/11.5f/3.9-f/10
Focal Length800-2415 mm1000-2500 mm
Highest Magnification300-480x500-600x
Price570-5,000$630-10,000$

8-inch vs 11-inch telescopes

8-inch telescope has less aperture than the 11-inch telescopes. They offer a focal ratio of  f/4-f/11.5 whereas the 11-inch telescopes vary from f/2.2-f/10. Besides, 11-inch telescopes offer a focal length of 620-2800 mm whereas the 8-inch telescopes start from 800 mm to 2415 mm mm in focal lengths. Moreover, 8-inch telescopes provide 300-480x the highest magnification, whereas 11-inch telescopes can magnify up to 558-558.8x..

8-inch telescope11-inch telescopes
Aperture8-inch (203 mm)11-inch (279 mm)
Focal Ratiof/4-f/11.5f/2.2-f/10
Focal Length800-2415 mm620-2800 mm
Highest Magnification300-480x558-558.8x
Price570-5,000$2,400-6,500$

8-inch vs 12-inch telescope

8-inch telescopes provide focal lengths of 800-2415 mm (f/4-f/11.5), while 12-inch telescopes vary in focal lengths from 1200-1525 mm (f/3.93- f/5). 8-inch telescopes provide the highest magnification of 300-480x, whereas 12-inch telescopes can magnify 600x.

8-inch telescope12-inch telescope
Aperture8-inch (203 mm)12-inch (305 mm)
Focal Ratiof/4-f/11.5f/3.93- f/5
Focal Length800-2415 mm1200-1525 mm
Highest Magnification300-480x600x
Price570-5,000$1,200-2,550$

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