Focus

Table 3.13: Focus Specifications

Drawing:	RCT001/3
EOS Drawing:	SCH-4026-1
Motor:
Motor Encoder:
Overall Encoder:	Heidenhain M12 or MT2571 linear encoder which is ENC#5
Limits:	two-level in and out limits
Controller:	PMAC#5
Drive Amplifier:	Amp 5
Homing:	positive motion away from primary.
	home is almost to the far limit
Scale:	20,000 counts per millimeter
Video camera:	-120700 counts
Range:	-435000 $-> +$ 3500 full range 21.925
	-425000 $-> +$ 1000 useful 21.3 mm

Note: It takes about 7 minutes to home. It seems that the camera focus is around -5.8mm.

(02Apr2003 statement focus=-99300 -0.21mm is a good focus).

Figure 3.20: Photo of the Focus