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I had both the Williams Optics Dielectric Diagonal and a GSO Dielectric Diagonal.
I found the Takahashi 1/10 2inch diagonal to be a lot better than either.
Also the Baader Diagonals are good too.
All depends on your budget .......but one thing to think about is that if you are planning to be doing astronomy for a while? and if you plan a future scope upgrade getting a very good diagonal and a few very good eyepieces will last you through many different scopes as they stay with you when you sell your OTA
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