Please use another browser such as Chrome, Edge, Firefox, or Safari for the best experience

Skip to content Comet ZTF Livestream

Apertura 8" f/4 Imaging Newtonian OTA

Free shipping

Add Apertura 32 mm Guide Scope - Black to your order

$119.95 $89.95

Add Apertura 2" Photo & Visual Coma Corrector for Newtonian Telescopes to your order


Apertura 8" f/4 Imaging Newtonian OTA

This telescope is a great choice for wide-field imaging! The fast 8" f/4 Newtonian optical tube assembly has diffraction-limited optics, a built-in cooling fan, and an extended tube in front of the linear-style 2" Crayford focuser that increases contrast by keeping stray light from hitting the optics.

The rolled steel 8" OTA is 28" long, has a diameter of 9", and weighs 18 pounds without the finder installed. The interior of the tube is painted flat black to reduce reflections. The center-spotted parabolic primary mirror is guaranteed to be diffraction-limited and is housed in an aluminum cell that is fitted with six "push/pull" collimation knobs for easy collimation without tools. The secondary mirror vanes (there are four of them) are as thin as possible while maintaining stability.

A pair of felt-lined split tube rings are included with the OTA. These rings can be attached to either a Vixen (included) or Losmandy-style mounting plate (sold separately), giving you the ability to use a wide variety of equatorial mounts. The Apertura 8" OTA also has a dovetailed finder adapter attached and accepts the included 50mm finderscope bracket. An 8x50 straight-through optical finderscope slides easily into this bracket.

The Apertura 8" f/4 Reflector OTA comes with a 2" dual-speed linear-bearing Crayford focuser. This focuser is very sturdy and has a monorail that will keep drag under heavy loads to a minimum. You can achieve rough focus with the larger of the two knobs, and then tweak your focus with the smaller 10:1 micro-focusing knob. There are two other knobs on the focuser: A tension knob allows you to adjust the drag on the draw tube to match the weight of the load, and the second knob locks the focus in place; a real help when imaging. The focuser comes with a 35mm 2" extension tube to help achieve the back focus requirement of your imaging set-up. Other extension tubes are available optionally for different back focus requirements. A 2" to 1.25" compression ring adapter is included as standard equipment.

Sometimes it seems to take forever for your telescope to cool to ambient temperature. The Apertura 8" f/4 Imaging Newtonian has a built-in cooling fan will help get you imaging faster! This low-vibration fan is mounted on the primary mirror cell and is powered by a battery pack that holds eight (8) AA batteries (batteries not included).

This Product Comes with the Apertura Absolute Warranty!

  • Two-Year Warranty against product defects.
  • Three-Year Accident Replacement Program that begins after your initial 2 year warranty expires.
  • Your Apertura Absolute Warranty is transferable.

Download a copy of the Apertura Absolute Warranty for more information on this program, how to make a claim, and why it is important to keep your original receipt and the product's original boxes & packaging!