Nexcope NE620T, Manual

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START-UP AND OPERATION
4
4.6. Optical design
NIS infinity plan objectives can provide high contrast and very flat image up to wide field
22 mm view. With FN 22 wide field eyepieces, the optical system always brings you sharp,
excellent resolution and high signal to noise ratio imaging.
• Plan objective
By using infinity plan achromatic objectives (NIS60 – 4x, 10x, 40x, 100x), flat image with
higher imaging reduction degree over the entire field of view could be achieved.
NE620T achieves the wide field of 22 mm view with 10x eyepieces for a more compre-
hensive observation content and faster sample observation. The eyepiece adopts a flat field
distortion-free design to prevent the edge of the field from being imaginary and stray light.
• 40x LWD objective
2
1
Illustration 019: 40x LWD objective of NE620T.
LWD = long working distance
The working distance (1) of 40x objective (2) can be up to 1.5 mm, avoiding the erosion
from residual immersion oil and water when converted from 100x to 40x objective.
40x LWD objective is included in the delivery.