The TeleVue 3-1/2 inch extension tube provides more out focus when removing a star diagonal for photography or straight through viewing. The TeleVue 3-1/2 inch extension tube with 2-inch I.D. is used to provide more path length or out focus. This may be needed to replace the path length of a star diagonal for straight through viewing, or to achieve focus in photographic applications. This extension tube features a brass compression ring to center and secure the attached two-inch accessory. |
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