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BST 1.25" Flat Field Eyepiece - 8mm

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Brand BST
Part Number E-BS-FF8
Availability available

Product Info

Manufacturer Description

Standard eyepieces provide sharp, pinpoint star images at the center of the field but as you look out toward the edges, stars often begin to get blurred and out of focus. Eliminating this distortion usually calls for expensive optical designs with additional lens elements to eliminate the field curvature. But these new BST eyepieces use a 5 or 6 element design that offers a flat field over the entire field of view at an attractive price.

Featuring large eye lenses, wide fields of view (from 53°-65°), and generous eye relief (from 9.6mm-24.4mm), these eyepieces are a pleasure to use. Fully multicoated lenses maximize light transmission and edge blackening of all lens elements ensures excellent contrast. Other features include safety recess grooves on the 1.25" barrels, standard 1.25" filter threads, and twist-up eyecups.


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Apparent Field of View 60°
Barrel Size 1.25" (31.7mm)
Bolt Case Included Yes - Free Agena Eyepiece Container
Bolt Case Size Agena 42x60mm
Coatings Fully Multi-Coated
Height (with Eye Guard) 2.00" (50.7mm)
Max Width 1.45" (36.9mm)
End Caps 2
Eye Lens Diameter 0.43" (11.0mm)
Eye Relief by Design 9.5mm
Field Stop Diameter 9.6mm / 0.38"
Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
Focal Length 8mm
Lens Elements 7
Lens Groups 4
Rubber Eye Guard Yes
Blackened Lens Edges Yes
Manufacturer BST
Eyepiece Focal Length 5.1mm - 10mm
Eyepiece Field of View 51 - 60 degrees
Eyepiece Series BST Flat Field
Barrel Type With safety undercut
Eyepiece Weight 2.60oz (73.71g)