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You guessed that I guessed, ah now I am confused. LOL I found that when I go from the 820mm of the Tak at prime focus to using the extender at 1312mm I have to drop the Ag setting down to about 2 from my usual 3-4 on the ST-4, I very rarely go above 5. With the Gemini in Photo mode the drive corrections are down to about .05 Siderial.
JohnG
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