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Baader finetuning FTR ring 14mm
The Finetuning FTR rings allow you to vary the focal length of the Hyperion eyepieces (all focal length models except the 24mm). In order to install it, simply unscrew from the body of the 31.8mm eyepiece barrel containing the negative element, screw the Finetuning ring and screw the barrel.
If you pay by bank transfer 11,93 €