The FSQ-ED utilized the
design technology of the ED lens which was cultivated in the TOA series.
Aberrations were well revised with an objective lens constructed of 4
lenses including two ED lenses so the FSQ capabilities were
Improved Color Correction
As a result
of using to high performance
ED glass elements, and by positioning the G3 element close to the G2
element, the FSQ-106ED has dramatically improved correction for color
and spherical aberration. The new design corrects color for over wide
range from the near ultra-violet to the near infra-red, 400nm to 1000nm,
which makes the FSQ-106ED the perfect imaging platform.
The new design increased
the size of the G3 element by 50% and placed it close to the G2 element.
The result is an increase in field illumination of 20 % for a 35mm
frame, 33% for a 70mm Ø image circle and 34% for the 88mm Ø image circle,
a great improvement over the standard Petzval design.
The new Extender-QE 1.6X was
designed to take advantage of the new capabilities of the FSQ-106ED
design. The new 50.8mm (2") five element corrector, flattener and
extender increases the focal length from 530mm f/5 to 850mm f/8
flawlessly. The correction provided by the Extender-QE allows the
highest possible magnification to be used. The 30% increase in color
correction provided by the Extender-QE produces diffraction limited
images at high and low magnification.
This newly designed
f/3.6 dedicated reducer for the FSQ-106ED is a 4 element in 3 group
0.73X accessory. The Reducer-QE maintains the same high level of color
correction and field flatness produced by the FSQ-106ED at its native
f/5 focal ratio. It was designed to be used with digital SLR's and CCD
Enhanced Back Focus
The FSQ-106ED has been
designed with a back focus of 178mm. This enhanced back focus will allow
the imager or observer to use any combination of CCD camera, binoviewer
or diagonal with their FSQ-106ED. The standard accessories include a
prime focus tube, compression ring 50.8mm (2") and 31.7mm (1 1/4")
adapters for maximum flexibility.