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and short circuit protection
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Every optical
edge field aberrations and pupil movement - all introduced when using Barlows with long focal length eyepieces
FLAT68III longer adjusting adapter for WIFD GT81-M54 Vaonis and short circuit protectionThis adapter for the William Optics Gran Turismo 81 WIFD has an M54x0. 75 male thread on one end and an M80x0. 75 female thread on the other. It has a length of 54 mm. To use this adapter, simply unscrew the original end adapter that terminates in the M48 male thread on the flattener and replace it with this longer adapter.
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