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Hi Malcolm,
I have used a couple of the Orion Stratus Eyepieces, the 13mm and the 17mm I think. I rate them very highly. They are a small notch below the premium offerings from Televue and Pentax but for they price they are easily the best choice for those needing good eye-relief with a generous FOV on a limited budget.
Assuming both your scopes are dobs and undriven, I would give some thought to getting the 8mm Stratus as opposed to the 8mm TV Plossl. The on axis performance level of the Stratus, while very good, is a small notch behind the TV Plossl. However, it has a much more generous FOV and longer eye-relief making it infinitely more comfortable to use for long periods.
I highly recommend the Stratus at this price level, They are clearly superior to any of the cheaper Chinese/Taiwanese offerings.
CS-John B
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