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A final update on my use of the PST.
My 9mm was not the best choice due to small eye relief 6.5mm and exit pupil 0.9mm, which made keeping my eye in the right place more difficult.
Instead I use a 2x Barlow and a 20mm plossl, 4mm exit pupil and 29mm eye relief, 40x mag. Past 48x is blurry so this is a good comfortable compromise.
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