Convergent FA10

FA telescopes FA telescopes

Telescope Name: Convergent FA10

Telescope Price: $9,495

Item #: CFA10

The AG Optical Systems Convergent Fast Astrograph .25 meter (10 inch) F5 telescope is an ultra-portable imaging instrument featuring a huge 40mm flat field. The outstanding optical performance of the FA10 is made possible through the convergence of careful design, state-of-the-art manufacturing, and precise assembly.   Wide field images are captured with high-contrast details and sharp stars across the entire field of view.




The AG Optical Systems FA10 F5 optical system provides exceptional thermal stability. Low expansion optics ensure the figure and focus stability of the Convergent FA10 as the temperature changes over the course of an imaging session. When combined with the rigid, thermally stable carbon fiber truss tube assembly of the FA10 you can expect to spend less time focusing and more time collecting data.

The Convergent FA10 carbon fiber truss optical tube assembly makes extensive use of carbon fiber composite materials, CNC-machined components, and precision collimation adjustments to provide a rigid and thermally stable platform for the low expansion optics. Three cooling fans speed the cooling of the primary mirror while primary and secondary mirror heaters can be automatically controlled by the optional Thermal Control System (TCS).

The optional, robust, digital Optec Gemini rotating focuser is ASCOM-compatible is capable of precision focusing and rotation while carrying heavy CCD imaging trains


Optical Tube Assembly

  • 33 lbs. carbon fiber tube assembly
  • Tube length: 23.5 inches
  • 10″ (.25m) low expansion substrate F5 optical system
  • 40mm corrected imaged circle, 1.8 degrees
  • Cooling fans and optional Thermal Control System
  • Dust covers
  • All CNC components, all stainless steel fasteners

Optical System

  • 10″ F5 corrected optical system with integral field corrector
  • 1255mm focal length
  • 6″ secondary obstruction (59% linear obstruction)
  • Performance: 5 micron RMS 15mm off-axis, 7 micron RMS 20mm off-axis
  • 4.7″ of back focus from Optec Leo focuser (3.45″ with Optec Gemini)
  • 5.95″ available back focus
  • 96% enhanced aluminum coatings



optec leo 3

Optec Leo 3″ Focuser

Ultra-low profile (1.25″), digital focuser with 20 lbs payload capacity, temperature compensation feature

Price: $1195
Item #: LEO


Truss shroud

Truss Shroud

Heavy Lycra shroud to block stray light, mitigate dust intrusion

Price: $125
Item #: FA10SHROUD

thermal control system

Thermal Control System

Computer-based automated control of primary mirror cooling, primary and secondary mirror anti-dew control

Price: $995
Item #: TCS


Piggyback Dovetail Plate

CNC-machine 6061 aluminum Losmandy “D” profile piggyback dovetail plate

Price: $215
Item #: FA10PIGGY

  • Carbon fiber optical truss tube assembly
  • Losmandy “D” mount dovetail
  • Primary and secondary dust covers
  • Primary mirror cooling fans with power cable
  • Low expansion substrate optics with enhanced aluminum coatings
  • All stainless steel fasteners and springs
  • Backplate carrying handles