iOptron CEM70 Instruction Manual page 54

(6) Click on the star to look at the Star Profile. Further fine adjusting the Focus Adjuster to
bring the Peak to maximum value.
(7) Slew the DEC to expose the Locking Screw if it is blocked by the DEC gear box.
Tighten the Locking Screw.
4. iGuiding Exposure Time Adjustment
When PHD2 has difficult to pick the guiding star due to a star in the interested area is not
bright enough or weather condition, one can adjust the camera exposure time. The camera
exposure time change won't be kept when power is off.
The power on default exposure value is -13, or 0.01 seconds. To adjust it, click on PHD2
Guide => Camera Settings.
Adjust the camera Exposure time to -7 (one second), or other numbers from the reference
table. Make sure that the PHD2 exposure time and camera exposure time are set the same.
Please refer to the following tables for exposure number and exposure time:
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