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The Lumicon LD2025 1.83" Enhanced Secondary Mirror is the same high-quality 1/8th wave mirror that Lumicon uses in its 2" Enhanced Aluminum Diagonal, the LD1015, and is suitable for use as a secondary mirror in Newtonian telescopes.
Note: For repairs of the LD1015, installation & collimation are free: mail your old diagonal to Lumicon, along with a check or money order for the replacement mirror and return postage, and Lumicon will install the LD2025 and collimate it at no extra charge.