The variable spacer / extension ring has been redesigned to minimize flex and enables you fine tune the exact distance you require between camera and flattener or filter holders, etc.
Useful in astronomy and microscopy for precisely adjusting the spacing between optics and camera sensors to get the best image.
Spacing distance can be adjusted precisely, measured between the two surfaces shown in the product image. Once adjusted, it's then locked in position with the locking ring.
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