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Hutech Borg Series Quick Start Manual

Focal reducer

The Borg 7004 set is an F4 focal reducer kit

for Borg Series 80 scopes (50, 76/77, and

100/101 achromat and ED objectives). Unlike

many reducers on the market, which typically

degrade the objective's performance, the ED

F4 reducer is designed to optimize

performance at F4 for modern fine-pixel

electronic sensors, while simultaneously

performing the focal length reduction and

field flattening functions.

The set includes the 4-element (1 ED element) reducer optical assembly, short tube with drawtube, and

spacers for optimized setups with different imagers. The optical arrangement is shown above and the system

diagram is shown below.

Borg Series 80 ED F4 Focal Reducer

Components:

•

Lens assembly

•

129mm tube

•

Drawtube

•

Spacer rings (5.3mm, 3.7mm, 2.0mm)

Hutech Corporation & ScienceCenter.Net

9/30/2004

2003-2004

Table of Contents

Do you have a question about the Borg Series and is the answer not in the manual?

Page 1 • Spacer rings (5.3mm, 3.7mm, 2.0mm) The Borg 7004 set is an F4 focal reducer kit for Borg Series 80 scopes (50, 76/77, and 100/101 achromat and ED objectives). Unlike many reducers on the market, which typically degrade the objective's performance, the ED...
Page 2 Borg Series 80 ED F4 Focal Reducer 9/30/2004 For optimized imaging performance, the correct spacer (provided in the 7004 set) should be used for the imager being utilized as detailed in the configurations listed below: • Borg 76/77 objective with digital SLRs: 3.7mm spacer + 7351 + 7000 + 5001-5010 + SLRs...
Page 3 Borg Series 80 ED F4 Focal Reducer 9/30/2004 Adjusting Focus To adjust focus, with the helical focuser at its middle position, set the rough focus using the drawtube. Once the drawtube is locked in place, adjust the helical focuser for fine focus.

Borg 80