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I was going to ask about the white bit but read about the white acrylic blank.
That looks quite good and a lot easier than my tracing board I sit on top of my telescope (A3). The tracing board does work well with a good variation range in brightness but it's only really suitable when the scope is vertical.
If I'm just playing with a camera and lens I just bring it inside and sit it lens side down.
I really need something more like your system me thinks.
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