Astro-Tech Flat Field 27mm 1.25" Eyepiece $79.99,  Astro-Tech ATFF27,Telescope Accessories Accessories, Top 10
Secure website, verified, safe for online shopping
The World's Largest Selection of Optics for Astronomy, Sport, Science and Education
Shop By Price
Shop By Interests
Gift Certificate



  Astro-Tech Telescope Accessories Accessories
Tell Friend  

Other products by Astro-Tech
Similar items
Astro-Tech Flat Field 27mm 1.25

Enlarge Photo
Sale Price: $79.99
Buy  Now!

Astro-tech Flat Field 1.25" 53 Degree Eyepiece 27mm, ATFF27

Item No. 758-20050
Manuf. No. Astro-Tech ATFF27

Astro-Tech Flat Field 27mm 1.25" Eyepiece, ATFF27

The 27mm Astro-Tech Flat Field is a very good low to medium power eyepiece for viewing emission and reflection nebulas and open star clusters, for scanning the star clouds of the Milky Way, etc. Its optical design provides a very flat field that keeps your image sharply in focus from one edge of its 53 degree field to the other. This flat field makes it a great match to the new breed of flat field/coma-free catadioptric telescopes.

The 27mm Astro-Techýs flat field shows you views of open clusters in which all the stars in the cluster are in focus, not just those in the center of the field. The moons of the gas giant planets show as sharply focused dots when they are at their maximum extension on either side of their sharply focused parent planet, not as the out-of-focus smudges often seen in lesser eyepieces.

Its 27mm focal length gives an f/4.5 Dobsonian owner a wide and bright 6mm exit pupil (about the maximum to which most observersý eyes can dilate) for engrossing rich field scanning of the Milky Way star clouds in Sagittarius. The clouds show myriad pin-point stars all across its wide 53 degree apparent field (a 1.25 degree actual field with a 10" f/4.5 Dob, two and a half lunar diameters across). And the 27mm Astro-Tech is an excellent choice to complement the 40mm eyepiece provided with some go-to Schmidt-Cassegrains.

This 27mm Astro-Tech Flat Field has an excellent 18mm eye relief for unvignetted images when used with eyeglasses. Best of all the 27mm Astro-Tech Flat field eyepiece is priced well below similar design eyepieces from other suppliers, and with double the warranty.


  • Field of view 53 degree
  • Eye Relief 18mm
  • Focal Length 27mm
  • Number of optical elements 5
  • Barrel Size 1.25"
  • Weight 6.4 oz.
  • Warranty 2 years

Need Help? To Place an Order: Please Shop Online,
Visit Any Scope City Center or Call Us Directly at 1-800-235-3344

Scope City 100% Satisfaction Guarantee

Scope City unconditionally guarantees that you will be 100% satisfied with your mail order purchase, or just
return the merchandise in original condition within 15 days for a Full Refund, less shipping and handling charges!