About Third Planet Optics (TPO) Imaging Newtonian Telescopes…
If you are looking for a telescope that does a great job of imaging but doesn't come with the cost of a Ritchey-Chretien, check out the TPO Imaging Newtonian line of telescopes! All of our Imaging Newtonian optical tube assemblies, offered in apertures from 6" - 12", have very fast optics for the widest fields possible. Image with a DSLR or small webcam all the way up to large sensor CCD cameras with these inexpensive yet effective Newtonians.
The optics on all TPO Imaging Newtonians consist of a parabolic primary mirror and an elliptical secondary, or diagonal. The mirrors are made from B270 white water optical crown glass, which is more thermally stable than glass traditionally used on other reflectors. A 91% aluminum coating is applied, and then over-coated with a layer of quartz for the ultimate in durability. The primary mirror cell is very sturdy, and has six collimation knobs that can be adjusted by hand with a push or pull of the knob. Collimation is made even easier due to the center spot marked on the primary mirror. The diagonal mirror is held in place with a thin four-vane spider.
The optical tube assembly on the TPO Imaging Newtonian telescope is made of rolled steel and painted white. The ends of the tube are die-cast aluminum, which contribute to the OTA's rigidity. Steel is a bit heavier than traditional aluminum, but since it has a lower coefficient of thermal expansion, your telescope will tend to hold its shape (and therefore, hold focus) as temperatures fluctuate throughout the night. The inside of the OTA is painted in a matte black finish, which stops stray light in its tracks.
A low vibration cooling fan is built into the primary mirror cell of the telescope to assist in cooling your optics down quickly. The fan is powered by a eight (8) AA batteries (not included) which are housed in an external battery pack.
A 2" dual-speed Crayford-style focuser rounds out this package. The ridged focusing knobs are easy to turn, even with gloves on, and the 10:1 microfocusing dial allows for very small changes, or tweaks, in focus. It takes ten turns of the microfocusing knob to equal just one turn of the larger knob. There is also a little knob on the bottom of the focuser that controls the tension, so that you can make adjustments depending on the weight or distribution of your load. You will also receive a 1.25" compression ring adapter for use with 1.25" eyepieces, and a 35mm extension tube to help you match the back-focus requirements of your imaging equipment. The telescope comes with dual split-hinged mounting rings that are made of die-cast aluminum and felted on the inside to cradle the OTA without scratching. There are threaded holes on the underside of the rings that allow installation on either a Vixen-style (included) or Losmandy-style dovetail plate. The top of the rings is also drilled so that you can mount accessories.
All TPO Imaging Newtonians come with an 8x50 straight-through finderscope. The ocular has a non-illuminated crosshair and has 13mm of eye relief. A quick-release mounting bracket is also included, and a dovetail foot is already installed on the OTA for easy on-off.
Third Planet Optics 8" f/4 Imaging Newtonian Highlights…
- Aperture: 8"
- Focal Ratio: f/4
- Focal Length: 800mm
- White rolled steel exterior, flat black interior for higher contrast
- 2" dual-speed 10:1 linear Crayford-style focuser with 35mm extension & 1.25" adapter
- Dual hinged rings with Vixen-style dovetail
- Cooling Fan included.
- Push/pull oversized collimation knobs for easy adjustments
- Weight: 16 lb.
- Additional Information
SKU OS-8IN Manufacturer TPO Telescope Series TPO Imaging Newtonian Optical Design Newtonian Reflector Mount Type None - Optical Tube Only Warranty 2 Year Warranty Telescope Aperture 8" Telescope Focal Length 800mm Telescope Focal Ratio f/4 Optical Tube Outer Diameter 9.25" Length of Optical Tube 28.5" Optical Tube Weight OTA is 16 lb., 20 lb. with all accessories Optical Coatings Aluminum Tube Color or Finish Gloss White Limiting Stellar Magnitude 14 Diagonal Included? No - Not Required Finder Included 8 x 50 Optical Finder OTA Mount Type Dual Rings
Customer Reviews 2 item(s)
- Good Value for The Money
- OK value for the money. Expect to upgrade the secondary alignment screws so that you can better align the optics. The springs on the primary mirror should also be upgraded so that alignment can be better maintained. If you are doing astrophotography with a heavy DSLR or CCD I would recommend that the focuser be upgraded too.
- Great Imaging Scope
Excellent for imaging, especially at this price. Can't go wrong here!
1= Houston, We Have a Problem & 5= It's Out of This World
- Included Items
- TPO 8" f/4 Imaging Newtonian with Steel OTA
- 2" Dual Speed TPO Crayford Focuser w/1.25" Adapter
- 35mm Extension Tube - 2"
- Dual Hinged Rings
- Vixen Dovetail
- 8X50 Crosshair Straight Thru Finder - White
- Finder Bracket & Dovetail Shoe
- Battery Box for Fan with 60" cord
- Mounting Hardware
- Hex Wrench for Screws
- Dust Cap
- Questions & Answers
Product QuestionsI have the Orion Sky view Pro mount will the Vixen dove tail work on my existing mounting
I know it meets weight specificationsQuestion by: Alan langworthy on Nov 20, 2016 9:49:00 AMThe primary mirror has 6 same shape/size knobs on the back (3 black and 3 white). Which are the locking knobs and which are the alignment knobs? Suggest a short instruction about the scope be available as a download or in the box.Question by: David Covey on Feb 24, 2017 5:33:00 PMThe manufacturer does not specify which color of screws are the push (locking) screws and which are the pull (adjustment) screws, but it is relatively easy to spot the difference when you have the scope in front of you. The locking screws do not have springs on them, while the adjustment screws have springs between the rear cell and the mirror cell.
We are always looking for new video ideas, so we have notified our marketing department to look into a video highlighting the TPO scopes.Answer by: Chris Hendren (Admin) on Mar 15, 2017 8:34:00 AMQuestion by: rayo on Apr 22, 2014 7:29:39 AMHello Rayo,
It does not since baffling is not needed for imaging on Newtonians like it is on refractors since the conical light path of a Newtonian begins at the back where the primary mirror is & not the front like a refractor where with that kind of system, it is essential to have baffling.Answer by: Roderick (Admin) on Apr 22, 2014 1:40:08 PM
- Support / Downloads
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