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25" eyepiece holder barrel on the eyepiece side with teflon compression ring
The functionality of the mount is superb
and there is no risk of cleaning solution migrating from the top of the lens and seeping around edges to be trapped in between elements
5 mm Diameter 58 mm Weight 370 g SKU BA2454608
Celestron Off Axis Guider OAG for Astronomy imaging Dobsonian 25" eyepiece holder barrel onOVERVIEW Most accurate way to guide improved accuracy compared to using a separate guide scope. 12. 5mm multi coated prism with aluminised backing for maximum reflectivity and illumination to the autoguider Fixed orientation helical focuser for easy, smooth and accurate autoguider focus 48mm clear aperture supports full frame cameras without vignetting Includes adapters with the correct spacing for DSLR cameras, Nightscape CCD and other popular
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