Takahashi Epsilon E-180 Reflector OTA


Available on backorder

The Takahashi Epsilon-180ED (D=180mm, F/2.8), based on catadioptric telescope design (means association of lenses and mirrors) offers a fundamental innovation compared with Newton reflector or Schmidt astrograph. Therefore, the Epsilon-180ED suits both visual observation and large field imaging needs.

The Epsilon-180ED wide field is perfectly flat and allows the use of traditional photographic formats as 24×36 (35mm) or 6×6 and even 6×9. Stellar images of less 20µ can be recorded, which highlights the extreme accuracy of this telescope. Epsilon’s images provide incomparable contrast and sharpness.


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Takahashi E-180 Epsilon 180 mm  Astrograph OTA

  • Takahashi E-180 Epsilon 180 mm ED is a f/2.8 Hyperbolic Flat-Field Astrograph Telescope
  • Takahashi E-180 has a super fast focal ratio of f/2.8
  • Takahashi E-180 Epsilon 180 mm ED low profile Crayford focuser that has a rotary connector system for camera framing
  • Full 5 Year Manufacturer Warranty

The Takahashi Epsilon 180ED f/2.8 Hyperbolic Flat-Field Astrograph Telescope is fast field photo visual astrograph that revolutionizes imaging. This fine instrument is perfect for the new multi-mega pixel digital 35 mm cameras and CCD imaging equipment as well as your traditional film methods with a 35 mm camera. The super fast focal ratio of f/2.8 not only means short exposure times, but picking up details normally invisible to slower focal ratio telescopes, such as faint extended nebulosity and details in the galactic structure.

The newly designed extra-low dispersion two element corrector housed in a rotating focuser assembly makes the Tak Epsilon 180 Astrograph special. No one knows optics like Takahashi and the ED design provides incomparable contrast and sharpness, combined with extreme accuracy. The Tak Epsilon 180 is a suitable, visual instrument capable of producing 10 micron stellar images across the entire super-flat field. The exposure time on the Tak Epsilon 180 becomes a fraction of what was once required to capture the image because of the fast speeds ensuring even less change of tracking errors or random change affecting your astrophotography.

The Tak Epsilon 180 has super solid, heavy duty construction that allows for transportation without the loss of its collimation. Giving you set up flexibility on the Tak Epsilon 180 is made possible with the mechanical design quality and the perfectly matched optics. These very features are very hard to match in other astrophotography oriented telescopes since no one quite makes Astrograph telescopes quite like Takahashi. Saving your precious dark time to concentrate on the essentials is made possible by initial collimations and installing your photographic equipment in advance. This fast control of your telescope put the Takahashi Epsilon 180ED Astrograph ahead of its class and makes your experience a much more pleasurable one.

The Tak Epsilon 180 comes equipped with a low profile Crayford focuser that has a rotary connector system for framing. This focuser can either be used when it comes to the ED corrector assembly or it can be removed if so desired. As an optional accessory, a microfocuser (MEF-1) is available. When both in place, the Crayford and corrector with yield a 44 mm (1.7″) flat field image circle large enough to cover a 35 mm sized CCD chip. The effective focal length on the Tak Epsilon 180 is 19.7″ (500 mm) and its back-focal distance measures 2.2″ (56 mm). The 4-lens corrector practically does not generate any chromatism and the diffraction pattern shows almost no coma.

The Takahashi Epsilon-180ED Hyperbolic Flat-Field Astograph telescope design isn’t as strenuous on the user. The Tak Epsilon 180 is far less sensitive to collimation issues because it is not a high-resolution reflector. It isn’t necessary to perform a star collimation at every set-up, unlike Cassegrain-style telescopes. The primary mirror cell is supplied with three dual-action collimation screws that either push or pull. There are also three screws with counter-nut adjustments to regulate the pressure on the primary mirror and to also keep flexure of the primary mirror under control during temperature change. To ensure perfect alignment of the optical axis there are reference marks on both mirror assemblies. Critical adjustments are quick, slick and easy because of this Takahashi system and its collimation eyepiece created for the Epsilon-180ED.

Getting superior contrast image with pinpoint stars right out of the edge of field will keep you pleased with your investment of the Takahashi Epsilon 180ED f/2.8 Hyperbolic Flat-Field Astrograph. Even though the Epsilon 180ED is mainly an astrophotography-minded telescope, it can also be a viable instrument giving first rate performance as a large field visual optical instrument.


  • Critical alignments are fast and easy with dual action collimation screws, collimation marks, and mirror tension adjustment
  • Offering a rotary system for framing and providing 56 mm of backfocus from the end of the corrector is made possible with the low profile Crayford-style rack-and-pinion focuser
  • Producing flat field images with no coma or chromatism is accomplished with extra-low dispersion two element corrector combined with a hyperbolic primary mirror
  • 180 mm effective aperture enables a light grasp of 661x at a limiting visual magnitude of 13.0 with an outstanding resolution factor of 0.64 arcsecond
  • Focal length of 500 mm and focal ratio of f/2.8 yield 44 mm image circle- 60% un-vignetted
  • Included is a M54 mm female thread photographic connector on the corrector (for wide T-mount)
  • Tube Dimensions: 570 mm/22.4″ (length) – 232 mm/9.13″ (diameter) – 22 lb/10.7 kg (weight)
  • Five Year Manufacturer Warranty



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  • Takahashi E-180 Epsilon 180 mm f/2.8 ED Astrograph Telescope OTA
  • Low Profile Crayford Focuser with Rotary System for Camera Framing
  • M54 Female Thread Photographic Connector

Model Number


Telescope Series

Takahashi Epsilon

Focal Ratio


Optical Design


Telescope Aperture

180mm (7.09″)

Telescope Mount Type

No Mount – OTA Only

Type of Electronics

OTA Only – No Electronics

Focal Length (mm)


Optical Coatings

Aluminum with Overcoating and Fully Multi-Coated

Image Circle

44 mm

Limiting Stellar Magnitude


Focuser Style

Crayford/Crayford Style

Focuser Speed

Single Speed

Telescope OTA Outside Diameter (in.)

9.13 (232 mm)

Telescope OTA Length (in.)

19.7 (570 mm)

Telescope OTA Weight (lb.)

22 (10 kg)


Takahashi 5 Years Optics/Mechanical, 1 Year Electronics