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More Information  · Images of Some Features Price $79.95 Field of view 60° Eye Relief 11mm Focal Length 12mm Number of optical elements 5 Barrel Size 1.25" Weight 4 oz. Warranty 2 years Telescope Eyepiece Formula To calculate the magnification and approximate actual field of view of this eyepiece on your telescope, enter the focal length of your telescope below and press the "Calculate" button. mm

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.