[Features] · Configured so that the optical axis height is at the center of the element when the element is 20 mm, and standardized at 25 mm from the bottom. · Move the upper sliding part to fix the prism. · Use the upper knob to fix without having to move the element. · The F551-20 bottom plate features M4 tapped holes. Mount a rod to change to a rod type. · F552-20 can be finely adjusted. · The elements are positioned using the pins in the three locations.
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