Simple Telescope Tester
I thought I would take this chance to tell you how to make a simple tester for the planetary optical performance of your Telescope by using actual scale distance.
1. Cut paper circles (sizes below).
2. Lightly colour the planets to match the real object.
3. Glue them onto a piece of dark cardboard.
Sizes of Planets: (at closest distance to Earth)
Mars - 21mm diameter
Jupiter - 40mm diameter
Saturn - 18mm diameter
Saturns Rings - 40mm oval
Uranus - 3mm diameter
Neptune - 2mm diameter
50km Lunar Crater - 25mm diameter
Now you are ready to test your scope.
Place the cardboard tester 165 metres from the telescope (or binocs) and see how clear an image you can get.
Let us know your results and which scope you used.
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