Borg Series 80 ED F4 Focal Reducer
9/30/2004
Hutech Corporation & ScienceCenter.Net
©
2003-2004
1
Borg Series 80 ED F4 Focal Reducer
Components:
•
Lens
assembly
•
129mm
tube
•
Drawtube
•
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
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.
