DFM Engineering, Inc.
1035 Delaware Ave. Unit D
Longmont, CO 80501
Phone: 303-678-8143
Fax: 303-772-9411



• Our typical 0.4M Classical Cassegrain has an F/3 primary mirror with an effective focal ratio between F/8 or F/12. The 76mm field is fully shielded and unvignetted.

• Focal plane position is between 0 to 20cm from instrument mounting surface

• Finderscope: 9x60 with illuminated reticle


• Invar spacers available to compensate for temperature and maintain focus

• Commercially available optical tube assemblies can also be mounted


• 15 in. diameter friction drives in RA and DEC

• Aluminum mirror cell with four, 12-bolt patterns

• Tracking accuracy: +/- 2.0 arc seconds in 2 minutes, +/- 20.0 arc seconds in 1 hour

• Pointing accuracy (with refraction and alignment correction) better than 30 arc seconds RMS

• Optical incremental position encoder drives are independent of the motor drives to provide excellent pointing

• Supports 20 kg instrument load with CG 18cm behind mounting surface

Standard Classical Cassegrain

Custom Telescopes

Telescope Control Systems (TCSGalil™)

Telescope Optics

Equatorial Fork Mount

Observatory Dome and Pier




Photo courtesy: University of Colorado - Boulder