This is a 10X PLAN infinite microscope objective. It has NA of 0.25 and ideal focal length is 180mm. Effective working distance is about 15mm. It is an excellent choice to start doing extreme macro using an objective.
Because it is an infinite objective, magnification can be varied by using different focal length tube lens. For example, when a 70-300 zoom lens is used as tube lens, when zoom is set at 200mm, magnification is 10x200/180 = 11,11x.
It has been tested that with some tele objectives there could be some vignetting on full format cameras if objectives is less than 180mm.
Youtube video how to set-up a Macro Objektive with a Telephoto-Lens:
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