Hi John i have the 16" and find it to a lovely scope. This is one scope i am keeping for the rest of my life. The only prob. i have had is the base being to big to get out door ways. This was a easy fix by cutting the base. The collimation is OK on my scope have not had any prob there. I have also added a light shield and a Agro Navis to the scope. The 16" is a big scope so to move it around i have put wheels on the bottom to which make it very easy to move.
Phil
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