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The Lunt Solar Systems 1.25" Mini Helical Focuser has a drawtube with a helical thread on it that screws the drawtube in and out to achieve focus. They are excellent at making precise fine-focus adjustments for observation and imaging. It is non-rotating so equipment remains in the same orientation during focusing, and provides a T2 male to T2 female thread connection with 0.4" (10mm) of travel. A brass compression ring protects 1.25" eyepieces from damage, and a locking collar keeps it securely seated during use.