Microscopes are simple in concept. Two lens elements are used to create a magnified image for viewing. An objective lens produces a magnified image which is again magnified by the eyepiece lens for an overall magnification equal to the product of the objective and eyepiece powers.
 | Microscope Focusing Bodies: Melles Griot microscope bodies accept all standard eyepieces, objectives, and accessories, and are available with coarse focusing only or with coarse- and fine-focusing mechanisms. |
 | Microscope Body Accessories: Melles Griot microscope body accessories include adjustable and angular eyepiece holders, a turrent and lens mount, focusing stages, and a microscope mounting plate. |
 | Microscope Eyepieces: An eyepiece, or ocular lens, magnifies the image from a microscope objective and relays this image to the observer. There are two types of eyepieces: the Huygens (negative) eyepiece and the Ramsden (positive) eyepiece. Because of their design, Huygens eyepieces can b e more thoroughly optimized for chromatic aberration than their Ramsden counterparts |
 | Reticles: Reticles are placed at the focal plane to assist in pointing and measuring. Melles Griot reticles are precision photochrome reproductions, deposited on a polished BK7 glass plate. |
 | Microscope Objectives: Most microscope objectives are optimized for the same object-to-image distance. This allows objectives to be interchanged without refocusing. Most Melles Griot objectives have an object-to-image distance of 195 mm because long focal lengths are required to maintain both the same image plane (150 mm from the mounting shoulder) and good image quality. All objectives are achromatic and have industry-standard microscope threads for cross compatibility.
The visible, infrared, and infinite-conjugate microscope objectives from Melles Griot are achromatic (i.e., color corrected at 656.3 nm and 486.1 nm). The RMS mounting thread (0.8 inch, 36 TPI) matches the industry standard making these objectives compatible with non–Melles Griot microscopes. Color coding makes identifying objective power easy when numerical markings cannot be seen. Visible objectives are antireflection coated for 400 to 700 nm; infrared objectives are antireflection coated for 1300 to 1500 nm.
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 | Microscope Objective Holders: Microscope objectives are frequently used as focusing lenses in laser systems because of their convenience. These microscope objective holders provide a simple method of mounting microscope objectives or other components with an RMS thread (0.8 in., 36 TPI) to mirror mounts and positioners. |
 | Resolution Test Targets: These test targets were designed to evaluate the performance of optical systems and photographic processes by assigning a numerical tolerance to the performance. The resolution of the system is determined by clearly identifying the smallest element (two target patterns of three lines each, at right angles to each other). |
