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Just something to be aware of if you're contemplating a fork mount for planetary imaging is that it's fine with Jupiter where the fast rotation imposes a total exposure limit of about 2 minutes. However with Mars and Saturn, where the planet's rotation is slow enough to allow you to expose for considerably longer, you will run into problems with field rotation in your image on an altaz mount. It's noticeable especially on Saturn where the angle of the ring plane moves slightly between the R, G and B exposures.No such problems with a C11 OTA on an equatorial mount.
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