Bestscope International Limited
7
．
Technical specifications BS-2090
7-1 Main specifications
Optical
system
Infinite Optical System
Viewing Tube
Compensation Free Trinocular Tube Inclined at 30;
Division ratio: 20% of Binocular Viewing and 80% of Video Viewing & Micrography
Eyepiece
Wide Field Eyepiece 10X, Linear Visual Field: 22 mm
Nosepiece
Backward Quintuple Nosepiece
Objective
Infinite Long Working Distance Plan Achromatic: 4X
、
40X
Infinite Long Working Distance Plan Phase Contrast: 10X
、
20X
Focusing
System
Coaxial Coarse and Fine Focusing System
Sensitivity and Graduation of Fine Focus: 0.002mm
Movement Range(from the surface focus of stage plate): up 8mm, down 3mm
Stage
Area: 160
（
width
）×
250
（
Length
）
mm
Mechanical
ruler
Movement Range: 120
（
width
）×
78
（
Length
）
mm
Illumination
Halogen Lamp 6V30W, Preset Center, Intensity continued Adjustable
Condenser
Long working Distance Condenser, Numerical Aperture 0.3, Working Distance 72mm
Operation
environment
Use indoor
Altitude: Maximum 2000 m
Temperature: 5
℃
~40
℃（
41
°
F~109
°
F
）
Maximum Relative Humidity: 80% at 31
℃（
88
°
F
）
, then Fall Linear.
70% at 34
℃（
93
°
F
）
, 60% at 37
℃（
104
°
F
）
,50% at 40
℃（
104
°
F
）
.
Pollution Degree:2 (refer to IEC60664)
7-2Objective Specifications
TYPE
MAGNIFICATIO
N
NUMERICA
L
APERTURE
（
N.A
）
WORKIN
G
DISTANC
E
（
mm
）
CONJUGAT
E
DISTANCE
（
mm
）
FOCUS
DISTANC
E
（
mm
）
COVER
SLIP
THICKNES
S
Infinite
Long
Working
Distance
Plan
Achromati
c
Objective
4X
0.1
25.2
∞
45
─
40X
0.6
3.2
∞
45
1.2mm
Infinite
Long
10X
0.25
11
∞
45
0.17
