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I have been completely happy with the early M68 OAG with the smaller prism, having resigned myself to spending the money on the new one, finding the original at a discount was a bonus given I know that it covers the sensor on my guiders anyway. I have never ever found myself without a guide star so the discount option was a no-brainer given I would need a new and much more expensive guide cam to take advantage of the bigger prism anyway.
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