Combining a step-down ring with Nikon’s telephoto lens (f = 300mm), attach an M26 microscope objective lens to the end.
Achieving imagery and observing a clear visual representation, the lens-side distance adjustment dial operates at a fine-tuning level.
Projecting a glass scale with a 0.2mm pitch, the horizontal field of view is 0.4mm, allowing for a magnification of approximately 800 to 1000 times.
It is worth noting that this method is applicable even with standard lenses (approximately f = 50mm). While the magnification decreases, it is adequately accommodated with ring illumination.
The focal length is around 40mm, shorter than that of a dedicated microscope.
