0.7X camera lens for microscope

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Features:

0.7X Barlow lens for SM series stereo microscopes, extending working distance and field view of the microscope and cutting magnification power by 0.7 times. Mounting size: 1-7/8 (48mm) in diameter.
This lens comes with a 1-7/8 (48mm) mounting thread and goes with most stereo microscopes.
It is a right lens for SM series stereo microscopes.
Its retail value is more than $200.