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What is the back-focus for a SW BD ED80?
Hi all,
Hopefully an easy question to answer. I have a Sky-Watcher Black Diamond ED80 that I intend to use for astro-photography. I have been trying to find out what the back-focus is but am struggling to find anything (yes I did a Google search).
If anyone knows, would be grateful if you could let me know.
Rene
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