The Olympus correction collar (Cat. Nos. AMEP4765EO, AMEP4763EO, AMEP4764EO, AMEP4849) can be used to adjust the working distance of the objective for the respective vessel/glass thickness. This allows you to use the same objective to image through different thicknesses of glass/plastic. Objectives without such a correction collar are generally only suited for a single thickness (e.g., 0.17 mm, 1 mm, or 1.2 mm).
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