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Old 16-06-2012, 02:02 PM
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iceman (Mike)
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Join Date: Sep 2004
Location: Gosford, NSW, Australia
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Canon 200mm.

I didn't move the tripod at all, didn't do any alignment.

I tried to go for Crux at first, and I found one of the limitations of the Polarie.

Because of the position of the unit, and the ball mount, I couldn't tip the camera back far enough and still have the camera sitting over the middle with good balance.

I had to tip the camera around on one side which put a lot of weight on one side (5D Mk II + 200mm lens). That, combined with the direction (south, rather than the ecliptic) probably produced more trailing than expected.

With the 200mm lens, I kept the exposures to 30 seconds @ ISO3200.

For the second lot of shots, I pointed at Antares. It was much easier to balance the camera in the middle of the unit while it was pointing east.

1st: Crux no tracking
2nd: Crux tracking
3rd: Crux 1:1 crop no tracking
4th: Crux 1:1 crop tracking
5th: Antares no tracking
6th: Antares tracking
7th: Antares 1:1 crop no tracking
8th: Antares 1:1 crop tracking

Looks like there's a bit of camera shake on the Antares ones. I didn't use mirror lockup.
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