50X Infinitely Long Working Focus Flat Field Achromatic Objective
Lens Product specification: Item Number | Product name | Specification | CCW-20XD | 20X Large N.A Objective | 20X Plan achromatic objective,Parfocal distance
95mm,W.D.20.68mm,focal Length 10mm,N.A 0.42 depth of focus
1.6μm,resolutions 0.7μm,FOVφ1.2mm(φ24Eyepiece),focal depth 3.3μm | CCW-50XD | 50X Large N.A Objective | 20X Plan achromatic objective,Parfocal distance
95mm,W.D.20.68mm,focal Length 10mm,N.A 0.42 depth of focus
1.6μm,resolutions 0.7μm,FOVφ1.2mm(φ24Eyepiece),focal depth 3.3μm
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Microscope objectives are the most important component of an
optical microscope, as they are responsible for primary image
formation and play a central role in determining the quality of
images that the microscope is capable of producing. The objective
lens is also a tool for determining the magnification of a
particular sample and the resolution of the lower fine specimen
details that can be observed in the microscope. In most laboratory microscopes, achromatic objectives are used. It
is brought into a single common focus; These objectives correct for
axial chromatic aberrations at two wavelengths (approximately 486
and 656 nm, blue and red, respectively). In addition, the
achromatic objective is corrected in the color green spherical
aberration (546 nm; See Table 1). The limited correction of
achromatic objectives can lead to significant artifacts when
examined and imaged with color microscopy and microphotography of
specimens. If the focus is selected in the green region of the
spectrum, the image will have a red magenta halogenation (often
called a residual color). Achromatic objectives produce the best
results through a green filter for light (usually an interference
filter), and are used when these objectives are used for
microphotography of black and white film. The lack of a correction
field (or flat field curvature) further hampers achromatic
objectives. In the past few years, most manufacturers have begun to
offer flat field corrections for achromatic objectives and give
these corrected flat field achromatic objectives the name.
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