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Burgess Optical Company
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7756 Oak Ridge Hwy.
Knoxville, Tennessee 37931, USA
PO Box 32515
Knoxville, Tennessee, 37930-2515, USA

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Eyepieces: EP Specifications

Planetary Fully broadband multicoated eyepieces (9mm has 6 elements, all others have 5 elements)

Focal Length
Barrel
FOV
Eye Relief
Field Stop1
Weight
2.5mm 1-1/4" 60o 16 16 n/a
3.2mm 1-1/4" 60o 16 16 n/a
4mm
1-1/4"
60o
16
16
n/a
5mm
1-1/4"
60o
16
16
n/a
6mm
1-1/4"
60o
16 *
16
5.7 oz.
7mm 1-1/4" 60o 16 16 n/a
8mm 1-1/4" 60o 16 16 n/a
9mm
1-1/4"
60o
16
16
5.8 oz.

1 The field stop measurement is of the field stop inside the eyepiece, which is associated with the field lens. The aperture of the relay lens visible in the end of the barrel is not the same as the field stop size.

* The first 6mm Planetary sold as a Burgess Special has less eye relief than that listed, which is the specifications for the final design of the 6mm. The Burgess Special 6 mm Planetary has approximately 13-14mm eye relief.

TMB Paragon SWA Super Wide Angle eyepiece, 6 elements, 4 groups, fully broadband multicoated eyepieces. See the Paragon page.

Bino-LiteTM 3 element, fully broadband multicoated lightweight eyepieces

Focal Length
Barrel
FOV
Eye Relief
Field Stop
Weight
20mm
1-1/4"
60o
18
19
2.5 oz.

Wide Angle 4 element, fully broadband multicoated eyepieces

Focal Length
Barrel
FOV
Eye Relief
Field Stop
Weight
8mm
1-1/4"
60o
10
9
2.4 oz.
12mm
1-1/4"
60o
12
13
2.9 oz.
17mm
1-1/4"
65o
17
19
3.6 oz.
20mm
1-1/4"
67o
20
21.5
3.6 oz.

Super Wide Angle 5 element (except 38mm - 6 element), fully broadband multicoated eyepieces

Focal Length
Barrel
FOV
Eye Relief
Field Stop
Weight
9mm
1-1/4"
74o
8
13
2.9 oz.
16mm
1-1/4"
72o
16
19
3.6 oz.
20mm
1-1/4"
72o
20
25
4.1 oz.
26mm
2"
72o
20
33
12.1 oz.
32mm
2"
72o
20
40
14.1 oz.
38mm
2"
70o
20
46
21.6 oz.

Ultra Wide Angle Eyepieces, Currently, the only Ultra Wide Angle Eyepiece available is the 11mm, which is being offered at a discount. The Ultra Wide Angle Eyepieces have 5 elements.

Focal Length
Barrel
FOV
Eye Relief
Field Stop
Weight
1-1/4"
80o
9mm
n/a
n/a

Notes:

  1. Eye Relief and Field Stop measurements are in millimeters (mm).
  2. Field stop measurements are rounded to nearest 1 mm.
  3. n/a means the specific information is not available at this time.

Price and Availabilty Information

Purchase Information



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