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Hi Frank
Thanks for your comments
I think the scope is at about f30. Used stacked 2x and 3x Barlows with an extension - gives a nominal 7.5x focal length or about f30 (scope is nominally f4). Measurement of the image scale also gives a similar result.
However, the image that comes up when you click on the post looks much larger then the one I uploaded - lots more black real estate- no idea why. On the original image, the planet is about 1/10 of the width of the 640x480 image.
regards Ray
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