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
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Features
- **Dial In Precise Backfocus:** Five rings (5/7/15/20/30 mm) stack in any combination to solve spacing for astrophotography and eyepiece projectionachieve fine adjustment from 5 mm up to 77 mm total.
- **True 2" Interface (M480.75):** 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 ringsideal for critical spacing on reducers/flatteners and camera adapters.
- **QCd & 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.
Description
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
Brand: starboosa
Objective Lens Diameter: 51 Millimeters
Product Dimensions: 5"D x 4"W x 5"H
Focus Type: Auto Focus
Finderscope: Straight-Through
Manufacturer: Starboosa
Product Dimensions: 5 x 4 x 5 inches
Item Weight: 11 ounces
Date First Available: August 22, 2025
Manufacturer: Starboosa
Frequently asked questions
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