M48 Fine-Adjustment Ring Set (0.3, 0.5 & 1mm)
Alpine Astronomical
From ~$9.44
2 stores
In stock
The Alpine Astronomical M48 Fine-Adjustment Ring Set provides precise focus tuning for M48-threaded optical systems commonly used in eyepiece projection astrophotography. This set includes three aluminum spacer rings with thicknesses of 0.3mm (black), 0.5mm (red), and 1mm (gold), each enabling approximately 2/5, 2/3, and 1 1/3 turns of rotation respectively. The threadless design prevents binding between M48 components, allowing for easy installation, removal, and disassembly without damaging equipment while achieving critical focus adjustments for planetary and lunar imaging.
Specifications
| Material | Aluminum |
| Color Coding | Black (0.3mm), Red (0.5mm), Gold (1mm) |
| Number of Rings | 3 |
| Design Feature | No threads - prevents binding |
| Ring Thicknesses Included | 0.3mm, 0.5mm, 1mm |
| Primary Use | Eyepiece projection astrophotography focus tuning |
| Thread Size | M48 |