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I haven't noticed any oscillation Martin but I could hook up a sensor and an oscilloscope later.
Failing that, I'm sure the grandchildren would love it were it not suitable for the purposes.
I've primarily used my old one on a 152mm refractor SkyWatcher Achro and 8" GSO f5 Newt. I've also sat my 14mm Rokinon lens on it with the D810 when I'm doing Milky Way panoramas.
A little tip, I leave the self adhesive plastic covering which came on the item new on it until I want to use the light pad, then I remove only as much as necessary, double check the surface then pull it back over after every use and I've not had problems with dust or cat hairs (I have cats).
I've seen the prices at other artsy type stores and the A3 units are far from cheap (I'm broke not cheap), the Aldi units are great for the money and my old one would have to be over 5 years old and still like new. It goes back in it's original box after every use.
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