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Polar scope is easy to use assuming you have darkish skies and a view to the south. It will get better results than drift aligning.
If you want to drift align then this is what worked for me:
1. I used a digital inclinometer to set the angle of latitude (about $25 off ebay).
2. I used a compass to set south fairly close allowing for my latitude offset (12 degrees).
3. I set up a 180mm lens on my full frame camera. I took a 30 second shot and zoomed in to check the stars. If elongated I moved the mount east/west a bit and took another shot. If it was better I moved it the right way and moved it a bit more if stars were not perfect. If worse I went the wrong way so moved it back further than where I started from.
Exposure, check the stars, move east/west as per the above. As long as you set your latitude angle right then this should get round stars in 90 second shots at 180mm.
Expecting 5-10 mins round stars at 300mm is in my opinion not possible with this unit, its not meant for that level of accuracy.
15 minutes at 21mm and round stars I have achieved with a polar scope.
Greg.
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