DFM Engineering, Inc.
1035 Delaware Ave. Unit D
Longmont, CO 80501
Our typical 0.8M Classical Cassegrain has an F/3 primary mirror with an effective focal ratio
between F/8 and F/18. The 125 mm field is fully shielded and unvignetted.
Both primary and secondary mirrors have a near zero expansion substrate
Back Focus is 28 cm from mounting surface
2 variable, low voltage power outlets for reticles provided on optical tube assembly
2 AC power outlets on optical tube assembly
Finderscope: 5 in F/9 with 2 in. dia, 32 mm focal length eyepiece and projection reticle
30 in. diameter friction drive in RA and 28 in. diameter friction drive in DEC
Open structure optical tube assembly affords better
Steel mirror cell with multiple 12-bolt patterns per KPNO standard
Tracking accuracy: +/- 0.5 arc seconds in 5 minutes, +/- 5.0 arcseconds in 1 hour
Pointing accuracy (with refraction and alignment correction) better than 30 arc seconds RMS
4 deg./sec. slew rate
Variable set, guide and tracking rates: 0 to 4 deg./sec.
Epoxy paint for durable, functional appearance
Supports 100 kg instrument load with CG 36 cm behind mounting surface