M42/M48/M54 Focal Plane Ring Deep Space Photography Adjustment

Key Benefits

• Adjusts focal plane position to match sensor depth in astrophotography systems
• Available in M42, M48, and M54 sizes for compatibility with different telescope and camera interfaces
• 10mm internal thread length provides stable mounting for camera bodies or adapters
• 3.5mm external thread length allows secure connection to telescope or lens flange
• Minimum thickness of 12mm ensures structural rigidity under long exposure conditions
• Lightweight design at 65g to 75g reduces load on telescope mounts
• Consistent thread lengths and diameters across sizes simplify system integration

Application Scenarios

• Fine-tuning the focal plane in a deep space imaging setup with a DSLR or dedicated astronomy camera
• Correcting focus shift when using a filter wheel or reducer in front of the sensor
• Aligning the sensor plane with the focal point of a telescope during long exposure astrophotography
• Adjusting spacing between a camera and a lens when using a teleconverter or focal reducer
• Building a custom imaging train with multiple adapters and ensuring consistent focus across the field

Who It Is For

• Amateur and professional astrophotographers building custom imaging trains
• Astronomy dealers supplying accessories for deep space imaging systems
• Educational institutions teaching optical alignment and imaging techniques
• Research labs conducting long-exposure imaging with fixed focal plane requirements
• DIY telescope and camera integration projects requiring precise spacing control

Problems It Solves

• A mismatch between the sensor plane and the focal plane causes soft or uneven focus across the image
• Using a fixed adapter without adjustment prevents fine-tuning when adding filters or reducers
• Lack of a dedicated focal plane ring leads to trial-and-error focus adjustments during imaging sessions
• Inconsistent thread lengths between components make it hard to achieve repeatable alignment
• Heavy or poorly designed rings add stress to telescope mounts during long exposures

Technical Features

• Internal thread length: 10mm for secure mounting of camera or adapter
• External thread length: 3.5mm for connection to telescope or lens flange
• Minimum thickness: 12mm to maintain structural integrity
• Thread sizes: M42, M48, M54, each with corresponding diameter and weight
• Designed for use in deep space photography where precise focus is critical
• Smooth internal and external surfaces for consistent mechanical fit
• No moving parts; adjustment is achieved by changing the ring's position in the train

Specifications

Specifications are taken from the AMADA product data for this item. Confirm critical dimensions with us in writing before ordering.

Customization Options

• Available in three standard sizes: M42, M48, M54
• Custom thread lengths or diameters available upon request with a quote
• Surface finish options (e.g. black anodized, silver, matte) available on request
• Specialized threading for non-standard camera or telescope interfaces upon request

Comparison With Other Options

Use Guide

• Install the ring between the camera body and the telescope or lens flange
• Ensure the internal thread matches the camera or adapter, and the external thread matches the telescope or lens
• Tighten the ring by hand first, then use a wrench if needed, but avoid over-tightening
• Adjust the ring position to achieve sharp focus across the sensor plane
• Use the ring to compensate for changes in optical path length when adding filters or reducers
• Check the alignment after each adjustment to prevent image distortion