Product features:
- Oldham Optics with Certificate of Conformity.
- Suprax glass optics (Zerodur on request)
- Automatic main mirror and secondary
   mirror covers with software control
- Remote operation possible.
- Choice of field flatteners and focal reducers.
- High strength carbon fiber tubing
- Microstep secondary mirror with software control.
- 3 cooling fans with control
- Feather touch double speed focuser for visual use.
- 18 points mirror support.
Cassegrain and Ritchey–Chrétien (RC) telescopes are used by professional observatories, research institutions and universities. The telescopes are made in open truss construction style with CFK-tubes and precision optics from Oldham Mirrors.

Customers can choose from the optical tube assembly (OTA) or the complete telescope system which can be set up in an equatorial or alt-az design. In combination with a focal reducer or field flattener, these instruments can also be used for large CCD sensors with diameters of 150mm and more and still display pin point stars all the way to the corners.
Best configuration possible: Oldham optics inside!
Oldham Optics has established itself as a very reliable manufacturer of precision optics. Oldham mirrors are of the highest grade in the industry: If your aim is perfect imaging quality and you do not want to spend the few clear nights with inferior optics, then Oldham should be your choice. In order for the optics to provide optimal
corrections also during volatile thermal conditions, we only offer our optical sets in either Supramax ceramics. Oldham offers perfect quality parabolic mirrors, flat optics as well as Cassegrain- and RC-Systems. Contrary to other optic vendors we deliver every optical set with test certificate and interferogram.
Astrofox designed and implemented many telescopes globally and all the optics delivered always more than have fulfilled their specifications.
System-wave front accuracy minimum L/8 Peak to Valley at 632 nm in focus
System-wave front accuracy minimum L/35 RMS at 632 nm in focus
Surface Quality 80/50 scratch/dig
Coating Aluminium and Quartz, other coatings like silver and gold upon request!
Optical performance that will always perform on the seeing limit Both the Ritchey-Chrétien and Cassegrain telescope will need a corrector when used with large format CCD cameras. When comparing the performance of both systems, the Cassegrain will perform very similar to the RC but at a lower price. The benefit of the RC-design lies in the fact that the field correction without field flattener is slightly
better compared to the Cassegrain. The result will be a more rigid system that will increase the precision of the telescope. Since professional telescopes are used in fixed locations, the slight gain of weight will be more than offset by the prevailing benefits such as higher pointing and tracking accuracy as well as improved focusing precision
AF500 specifications
  Aperture   500 mm
  Focal length   4000 mm
  Focal ratio   F8
  Back focus   350 mm (other on request)
  Field of view   86 arc mins (80 mm)
Mechanical specifications
  Material   High end alumnium and carbon fiber
  Workmanship   Hand made
  Weight   80 kg
  Image quality   See spotdiagram
  Cooling   Computer controlled fans
  Focuser   Computer controlled focuser
  Baffle   Main mirror baffle
Main mirror specifications
  Optical diameter   500 mm
  Mirror diameter   510 mm
  Mirror material   Suprax
  Coating   Ai+Sio2 coating 96% refection
  Surface quality   L/8 PTV wavefront
  Mirror thickness   50 mm
  Mirror cell   18 point floatation
Secundary mirror specifications
  Optical diameter   180 mm
  Mirror diameter   185 mm
  Mirror material   Suprax
  Coating   Ai+Sio2 coating 96% refection
  Tickness   30 mm
Click on picture to enlarge  Click on picture to enlarge  
Optional equipment:   prices excl VAT and factory
4” field flattener corrector: on request
4” reducer corrector: on request
4" rotator on request
Mirror material Zerodur on request
Camera adapters on request
Different focal ratio on request
Mirror material Zerodur on request
Ritchey–Chrétien (Standard configuration):
   AF500 EUR  33500,-  excl. VAT and shipping