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This practical pier extension allows you to take images uninterrupted, even when the object crosses the meridian. Works with refractors up to 5″ or reflectors up to about 10″. The elevation range is 35-50 degree. Adds 390 mm to the pier (241 mm more than the original base) and weights 5 kg. Robust aluminum construction that will not compromise stability. The RA head can be exchanged in 5 minutes between the original and the extended base.