|
FSQ-ED Characteristics
The=20
FSQ-ED utilized the design technology of the ED lens which =
was=20
cultivated in the TOA series. Aberrations were well =
revised=20
with an objective lens constructed of 4 lenses including two =
ED=20
lenses so the FSQ capabilities were exceeded=20
photographically.
* Improved Color=20
Correction
As a result=20
of using=20
to high performance ED glass elements, and by positioning =
the G3=20
element close to the G2 element, the FSQ-106ED has =
dramatically=20
improved correction for color and spherical aberration. The =
new=20
design corrects color for over wide range from the near =
ultra-violet=20
to the near infra-red, 400nm to 1000nm, which makes the =
FSQ-106ED=20
the perfect imaging platform.
* Improved=20
Illumination
The new design =
increased the=20
size of the G3 element by 50% and placed it close to the G2 =
element.=20
The result is an increase in field illumination of 20 % for =
a 35mm=20
frame, 33% for a 70mm =D8 image circle and 34% for the 88mm =
=D8 image=20
circle, a great improvement over the standard Petzval=20
design.
* Improved High=20
Magnification
The new =
Extender-QE 1.6X was=20
designed to take advantage of the new capabilities of the =
FSQ-106ED=20
design. The new 50.8mm (2") five element corrector, =
flattener and=20
extender increases the focal length from 530mm f/5 to 850mm =
f/8=20
flawlessly. The correction provided by the Extender-QE =
allows the=20
highest possible magnification to be used. The 30% increase =
in color=20
correction provided by the Extender-QE produces diffraction =
limited=20
images at high and low magnification.
* Reducer-QE=20
0.73X =
This newly =
designed f/3.6=20
dedicated reducer for the FSQ-106ED is a 4 element in 3 =
group 0.73X=20
accessory. The Reducer-QE maintains the same high level of =
color=20
correction and field flatness produced by the FSQ-106ED at =
its=20
native f/5 focal ratio. It was designed to be used with =
digital=20
SLR's and CCD cameras.
* =20
Enhanced Back Focus =
The FSQ-106ED =
has been=20
designed with a back focus of 178mm. This enhanced back =
focus will=20
allow the imager or observer to use any combination of CCD =
camera,=20
binoviewer or diagonal with their FSQ-106ED. The standard=20
accessories include a prime focus tube, compression ring =
50.8mm (2")=20
and 31.7mm (1 1/4") adapters for maximum=20
flexibility.
| ![](3D"http://www.astrosurf.com/ilizaso/Takahashi%20FSQ-106ED/Ronchi.jpg"=)