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If you're keeping the 150p, then it must be the 250px. If your Mk 1s are well used, you could find Binoviewers a revelation (on the Moon and planets particularly). Then the Flextube feature will be essential to reduce the truss tubes by a compensating light path distance of 10cm. And the extra light gathering will be very useful. I have used the fixed tube 250px and prefer the focal length (1200mm) it provides for Moon and white light solar imaging with my DSLR than my Flextube 300p (1500mm) which makes the DSLR FOV just a little tight, but the extra light gathering is great with BVs.

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