I've been looking at using it for some photography but I am finding that when I slew from one object to another the focus shifts. Not such a big deal for visual but annoying - I have the mirror lock on so I am a little surprised as to how/why this occurs?
Can anyone direct me to a resource? - how can I tighten this up. I would have thought once I engaged the mirror lock the focus would hold from east to west.
Karen,
The slop/flop of the main mirror in an SCT can certainly be improved by running the mirror up and down the baffle tube; by rotating the focusing knob (about 30 turns) each way a few times.
This re-spreads the grease on the baffle tube and reduces the effective gap.
A routine job which should be done by all SCT owners at regular intervals.
Hope that helps.
Karen,
The slop/flop of the main mirror in an SCT can certainly be improved by running the mirror up and down the baffle tube; by rotating the focusing knob (about 30 turns) each way a few times.
This re-spreads the grease on the baffle tube and reduces the effective gap.
A routine job which should be done by all SCT owners at regular intervals.
Hope that helps.
Drilled the back cell on mine and I have three bolts going right through. I get to focus then touch the bolts to the glass and it holds the mirror in place on three points.
Karen,
The slop/flop of the main mirror in an SCT can certainly be improved by running the mirror up and down the baffle tube; by rotating the focusing knob (about 30 turns) each way a few times.
This re-spreads the grease on the baffle tube and reduces the effective gap.
A routine job which should be done by all SCT owners at regular intervals.
Hope that helps.