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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