Hutech Astronomical Products
Equipment for the Serious Amateur Astronomer


Borg Intro

About the Borg Design Philosophy

Borg FAQs

Complete Systems

Optical Tube Assemblies

Component Combo Solutions

Telescope Components

Borg Image Samples

Borg Flatteners, Reducers, and Teleconverters

Part No. Description Lens Design Focal Length
Weight Remarks
7885 0.85X reducer 2 elements in 2 groups 250 to 400mm 40mm 70g 10 micron spot size out to 26mm dia. (with 45ED). Performance is optimized for digital SLR cameras.
7887 0.85X reducer DGL 2 elements in 2 group 500 to 800mm 43mm 110g Optimized for digital imagers. Works with 76ED/77ED, 100ED/101ED, 125ED.
8044 0.625x super reducer 4 elements in 4 groups 640mm 110mm 800g 32 micron spot size at 88mm diameter
8045 0.625x super reducer 4 elements in 4 groups 800mm and 1000mm 83mm 800g 16 micron spot size at 88mm diameter
  • The image circle is defined to be the diameter at which the illumination drops to 60%.
  • A 35mm frame requires a 43mm illumination circle.
  • A 6x7 frame requires an 88mm illumination circle.
  • All lenses are multicoated on all surfaces (fully multicoated)

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