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Somethings wrong here, the site shows the encoder fitted directly to RA as an output encoder. To resolve 1 arcsecs, it then needs to have at least 1.2million ticks per rev. Ive seen Heidehain encoders a lot over the years on CNC machines, they are top shelf, and, very expensive. I scaned Heidenhains site for prices and anything like the model they used, to no avail unfortunately (the picture res of the encoder frustratingly doesnt allow reading of the model number), but at a guess an encoder alone of that res would be many times more than 1k euro. So, Im thinking they have gear reduction on a lower res encoder, which then raises questions of machining accuracy/variability between examples and PE within its own gearing.
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