Correct me if I'm wrong, but I think the magnifications in this article are incorrect.
The PST has a FL of 400mm at the input end, but then at the output end there is effectively another scope with an FL of 200mm.
If this is the case, then a 12mm eyepiece will give a magnification of 16.7x, not 33x as shown in the article.
Cheers,
Jason.
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