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Borg Astrographs


 

B12565

  BS77EDII
  • BORG 125 OTA set (# 9125)
  • 1.08x flattener (# 7108 )
  • Total of 4 elements
  • 810mm focal length
  • F 6.5
  • 35mm full-frame coverage

 

B12551

  BS71FL1
  • BORG 125 OTA set (# 9125)
  • 0.85x reducer (# 7887)
  • Total of 5 elements
  • 630mm focal length
  • F 5.1
  • 35mm full-frame coverage

 

B12539

  BS71FL2
  • BORG 125 OTA set (# 9125)
  • 0.65x reducer (# 7704)
  • Total of 6 elements
  • 480mm focal length
  • F3.9
  • 35mm full-frame coverage

 

B07743

  BS60ED
  • BORG 77EDII OTA
  • 0.65x reducer (# 7704)
  • Total of 6 elements
  • 330mm focal length
  • F4.3
  • 35mm full-frame coverage
                        

 

B07139

  BS50FL1
  • BORG 71FL OTA
  • 0.7x reducer (# 7870)
  • Total of 5 elements
  • 280mm focal length
  • F3.9
  • 35mm full-frame coverage

 

B07160

  BS50FL2
  • BORG 71FL OTA
  • 1.08x flattener (# 7108)
  • Total of 4 elements
  • 430mm focal length
  • F6.0     
  • 35mm full-frame coverage

 

B06049

  BS45EDII
  • BORG 60ED
  • 0.85x reducer (# 7885)
  • Total of 4 elements
  • 300mm focal length
  • F4.9
  • APS-C coverage

 

B06040

  BS45EDII
  • BORG 60ED
  • 0.7x reducer (# 7870)
  • Total of 5 elements
  • 245 mm focal length
  • F4.0
  • 35mm full-frame coverage

 

B05056

  BS45EDII
  • BORG 50FL
  • 0.7x reducer (# 7870)
  • Total of 5 elements
  • 280 mm focal length
  • F5.6
  • 35mm full-frame coverage

 

B04550

  BS45EDII
  • BORG 45EDII
  • 0.7x reducer (# 7870)
  • Total of 5 elements
  • 227 mm focal length
  • F5.0
  • 35mm full-frame coverage

 

B03660

  B03660
  • BORG 36ED
  • 1.1x flattener
  • Total of 4 elements
  • 216 mm focal length
  • F6.0
  • APS-C coverage

 

B03660a

  B03660a
  • BORG 36ED
  • 1.1x flattener
  • Total of 4 elements
  • 216 mm focal length
  • F6.0
  • APS-C coverage