Coaxial illumination is a lighting method designed for observing specular reflectors.

(It is not suitable for observing diffuse reflectors.)

When observing diffuse reflectors, hotspots (extremely bright areas) occur.

Furthermore, the effect becomes more pronounced at lower magnifications.

(In the case of diffuse reflectors, ring illumination is recommended.)

 

 

 

■Zレンズの最低倍率（X0.7）で上記３点を観察

 

 

Even with glossy ceramics, slight hotspots may persist.

Objects ranging from surfaces reflecting surrounding scenery to specular reflectors are within the appropriate observation range.

 

■ Methods to Reduce Hotspots

If the camera has HDR (High Dynamic Range) capabilities, there is a method to reduce hotspots by sacrificing color vividness.

(However, generally speaking, for diffuse reflectors, it is recommended to use ring illumination rather than coaxial illumination.)

 

 

(HDR set to 0 for observing white paper)

 

 

 

（HDR 3　で白紙観察）