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This Half Pillar provides a 9" extension between the counterweight shaft or longer tube refractor and the tripod legs
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Adds 20mm of length to the R200SS Optical tube and allows attachment of a 42mm T thread to 43mm accessory. This is customarily used with optional item number 3523 for eyepiece projection photography
Enhances the ability to perform astrophotography for many telescopes needing more back-focus, by moving the film plane back up to a maximum of 40mm.
Allows astrophotography for many telescopes needing more back-focus by moving the film plane back up to a maximum of 2.6".