Astro-Tech Flat Field 12mm 1.25" Eyepiece $79.99,  Astro-Tech ATFF12,Telescope Accessories Accessories, Cheapest Prices
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Astro-Tech Flat Field 12mm 1.25
Sale Price: $79.99
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Astro-tech Flat Field 1.25" 60 Degree Eyepiece 12mm ATFF12

Item No. 758-20035
Manuf. No. Astro-Tech ATFF12

Astro-Tech Flat Field 12mm 1.25" Eyepiece, ATFF12

The 12mm Astro-Tech Flat Field is a very good medium to medium high power eyepiece for observing lunar and planetary detail, resolving globular clusters, picking up detail in smaller galaxies, etc. It has a very flat field that keeps your image sharply in focus from one edge of its wide 60 degree field to the other. This makes it a great match to the new breed of flat field/coma-free catadioptric telescopes. Dobsonian owners will also appreciate not having to constantly tweak the focus as objects drift across their field of view.

This flat field lets you scan the lunar surface, for example, and see sharply defined craters and rilles filling the entire field, rather than having the image soften and blur disconcertingly towards the edges as you often find is the case with the curved field of conventional eyepiece designs.

The 12mm focal length of this Astro-Tech Flat Field is typically unavailable from suppliers of similar, but higher-priced, flat field designs.

This 12mm Astro-Tech Flat Field has a reasonable 11mm eye relief that may mildly vignette the field for eyeglass wearers. Those who must wear eyeglasses while observing due to severe astigmatism would probably be better off using a good Barlow and the 27mm focal length Flat Field eyepiece (which has a much longer 18mm eye relief) to approximate this focal length, rather than buying this eyepiece for use on its own.


  • Eye Relief - 11mm
  • Focal Length - 12mm
  • Number of optical elements - 5
  • Barrel Size - 1.25"
  • Weight - 4 oz.
  • Warranty - 2 years

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