RITCHEY-CHRETIEN
OPTICS
ASTROGRAPH SERIES
Specifications
for standard design optics follow.
Note: Diameter of primary and secondary mirrors represents mechanical blank dimensions.
|
RITCHEY-
CHRETIEN ASTROGRAPH |
BACK
FOCUS |
SPACING
|
PRIMARY
THICKNESS |
PRIMARY
HOLE |
SECONDARY |
NOVEMBER 18, 2007
PRICING* |
RC-10A |
10”
f 7 |
9" |
22.40” |
1.25” |
3.5” |
5.0" * 0.65" |
SOLD OUT |
RC-12A |
12.5"
f 6.6 |
9" |
27.33" |
1.50" |
3.5" |
6.0" * 0.75" |
SOLD OUT |
RC-14A |
0 |
0 |
0 |
0 |
0 |
0 |
SOLD OUT |
RC-16A |
16"
f 6.4 |
10" |
34.45" |
2.00" |
4.0" |
7.25" * 1.00" |
|
RC-20A |
20" f 6.8
|
12" |
46.30" |
2.00" |
4.5" |
9.00" * 1.50" |
|
*Price does not include coatings.
FOB Newnan, GA |
While others may promise you “the Sun, the Moon and the Stars”,
STAR INSTRUMENTS is pleased to offer the ULTIMATE in optics for the amateur astrophotographer at a down-to-earth price!
For the past several years, Star Instruments has been developing a low-cost alternative to our professional series of Ritchey-Chretien optics. Our goal was to design a system with as flat a field as possible, no color and a system that could be produced less expensively. With these goals in mind we designed a system using Pyrex mirror blanks, a 50% central obstruction and a short back focus.
The Star Instruments Ritchey-Chretien Astrograph is the ultimate optical system producing impressive results. When compared to f8 coma-free Schmidt-Cassegrain systems, the RC Astrograph has no color, approximately twice as flat a field, less astigmatism and a faster f ratio – the qualities that advanced astrophotographers have been seeking for deep sky astrophotography. Optics are diffraction-limited for maximum performance.
Spot sizes for the corners using a 35mm format are as follows:
RC-10A 17 microns
RC-12A 20 microns
RC-16A 20 microns
RC-20A 20 microns
For information regarding optical tube assemblies using Star Instruments
Ritchey-Chretien Astrograph optics, click on the following links:
