M48 2-Inch Extension Tube Kit — 5/7/15/20/30mm Rings — M48×0.75 Male & Female Threads — for DSLR/SLR Backfocus, Flatteners & Eyepieces — 5-Ring Set

# Key Product Features **Dial In Precise Backfocus:** Five rings (5/7/15/20/30 mm) stack in any combination to solve spacing for astrophotography and eyepiece projection—achieve fine adjustment from 5 mm up to 77 mm total. **True 2" Interface (M48×0.75):** Double-threaded male & female M48 on every ring for easy stacking and broad compatibility with 2" accessories that use the 48 mm filter thread (flatteners, reducers, filter holders, OAGs). *Note: M48 (2" filter thread), not M42/T-2.* **All-Metal, Anodized Build:** Durable aluminum construction with a hard, matte anodized finish resists wear and reflections; precisely cut threads engage smoothly to help prevent binding or cross-threading. **Maintain Optical Alignment:** Tight tolerances help keep the optical train square and repeatable when adding or removing rings—ideal for critical spacing on reducers/flatteners and camera adapters. **QC’d & Ready for the Field:** Each set is test-assembled and visually inspected for fit and finish before packing, so you can focus on capturing sharp, high-contrast images. --- # What’s in the Box **Five M48 Extension Rings:** 5 mm, 7 mm, 15 mm, 20 mm, 30 mm **Thread Spec:** M48×0.75 male on one side, M48×0.75 female on the other (double-threaded) **Compatibility:** Works with 2" accessories that use the M48 (48 mm) filter thread

• **Dial In Precise Backfocus:** Five rings (5/7/15/20/30 mm) stack in any combination to solve spacing for astrophotography and eyepiece projection—achieve fine adjustment from 5 mm up to 77 mm total.
• **True 2" Interface (M48×0.75):** Double-threaded male & female M48 on every ring for easy stacking and broad compatibility with 2" accessories that use the 48 mm filter thread (flatteners, reducers, filter holders, OAGs). *Note: M48 (2" filter thread), not M42/T-2.*
• **All-Metal, Anodized Build:** Durable aluminum construction with a hard, matte anodized finish resists wear and reflections; precisely cut threads engage smoothly to help prevent binding or cross-threading.
• **Maintain Optical Alignment:** Tight tolerances help keep the optical train square and repeatable when adding or removing rings—ideal for critical spacing on reducers/flatteners and camera adapters.
• **QC’d & Ready for the Field:** Each set is test-assembled and visually inspected for fit and finish before packing, so you can focus on capturing sharp, high-contrast images.