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Home Astro-Imaging T Thread & M48 Extensions Altair 7.5mm M48 Spacer Extension - Easy Grip
The Starwave 7.5mm extension spacer tube has a male and female M48x0.75 filter thread on each end, these high quality M48 extensions are perfect for fine tuning sensor distances for astrophotographers.It has an Easy-Grip knurled ring for easier loosening / tightening - especially useful in cold weather with gloves on.The spacers can be "stacked" with other M48 fspacers or M48 variable spacers in the range to achieve the exact distance you need between camera and flattener for optimum corrections.