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If you have smooth PE and a short FL, yes , external autoguiding at 2 secs can work perfectly, it will track PE, but if for instance you use internal guide with an SBIG guiding with 10 sec guide exposures or more with long FL, PEC and low PE become very important.
The point in spending money on low PE, is the reduced reliance on fast tight guiding. This product becomes very usefull with long FL long internal guide exposure times. Rather than a waste of money, it saves money on expensive mount upgrades
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