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Hi Matt, thanks for the response. The Tak lens is a bit finicky getting to the upper elements. Need to access via the bottom. I will need to fabricate a special tool to engage the retaining collar methinks. Have to sleep on that one! I’ll be travelling for the next couple of months so it can wait til mid year when the seeing here is permanent rubbish.
(As an aside, I’m impressed with your Excalibur build. My build version with Mark’s mirror is reasonably functional, but not without its flaws. The 18” does gather a reasonable amount of light to cut through the soupy skies here though.)
Cheers Brian
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