Can you help me calculate the magnification range when using Navitar 12X Ultra Zoom lenses with a Mitutoyo Objective lens of 5x or other infinity corrected objectives and an adapter of 2X?
To understand the magnification characteristics of the 12x UltraZoom, we must start with the magnification characteristics of the standard 12x system. The magnification range of a 12X system with a 1X adapter and no lens attachment is 0.58X to 7.00X. Logically, one would assume that placing a 2X adapter on this system (above the zoom) would result in a doubling of the magnification yielding a magnification range of 1.16X to 14.00X and this is correct. However, when a Mitutoyo objective is introduced the equation changes in two ways. The Mitutoyo objective was designed to function with a 200mm tube lens. The Navitar 12X is equivalent to a 178mm tube lens changing the multiplication factor to (178/200) .89. Additionally, to add the microscope objective to the 12X zoom we must remove the existing lens from the bottom of the zoom. The result is, essentially, the reduction of the magnification of the objective by ½. Therefore, if a 12X zoom is used with a 5X Mitutoyo objective and a 2X adap
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