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400mm F/4, Albert van Duin

400mm F/4

400mm F/4, Albert van Duin

400mm F/4

Description

June 15 2011, the day of first light for my home built 400mm F/4

For some time now, I have been using a different coma corrector (TeleVue) which makes it an F/4.5

The telescope is on a steel pier now, which makes it much more stable.

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400mm F/4, Albert van Duin

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