|
|
|
|
|
Top > Telescopes > Astrographs > Borg 101ED - 101mm f/4.1 Astrographic Refractor |
|
 |
Borg 101ED - 101mm f/4.1 Astrographic Refractor SKU: 101EDF4.1
PRICE: 2,495.00
|
|
Borg 101ED - 101mm f/4.1 Astrographic Refractor Description
|
|
Check out the Sky & Telescope article on the Borg astrographs
One of the fundamental cornerstones of Borg's scope designs has been
excellence in performance as astrographs - high-performance objectives combined
with uniquely high-performance flattener/reducer elements, specially designed
for imaging.
These astrographs utilize the new Borg 4-element ED super reducer, which is
optimized for digital imagers, yet covers a full 35mm-sized frame. All
astrographs also include built-in filter holders as well as a camera rotator for
flexible image composition. Borg helical focusers are standard, but motorizable
Feather Touch focusers are an option.
Focal reducers are optimized for specific distances between the optical
components and the image plane. For the F4 focal reducer, these are accomplished
through the use of calibrated spacers for specific focal lengths. Two 63mm
diameter spacers are provided for the front (between focuser and front reducer
lens assembly), and two 58mm diameter spacers for the rear (between the rear
reducer lens assembly and the camera adapter).
Provision for the attachment of filters is via a a 55mm diameter filter
thread on the front reducer lens assembly (for semi-permanent filter
installation) and via an easily removed filter holders which accommodate 52mm or
48mm filters. A camera shutter cable can be attached to the focal reducer
assembly to make removal of the filter holder a simple operation which does not
disturb the optical train. Additional filter holders are available for quick
changes between filters.
|
|
Copyright ©2000-2009 Starizona
Adventures In Astronomy & Nature, All rights reserved
5757 N. Oracle Rd., Suite 103 · Tucson, Arizona 85704 · Call Us: (520) 292-5010
Map & Directions -
Return Policy
|
|
|
|
|