Eyepiece holders and adapters Kepler 35 mm self-centering extension tube 2'' Kepler KE262 31.36 VAT excl. 35mm self-centering extension tube 2'' Kepler. Extension tubes allow the position of accessories (usually eyepieces or photographic adapters) to be moved backwards to reach the focus of the instrument. These models from Kepler, available in 3 lengths, have a rotational ring lock that maintains perfect centering of the accessory in the tube Stock at Supplier Deliver it 15/23 days Add to basket