TESTING TELESCOPES FOCUS ADJUSTABLE – WITH STRAIGHT VI EWING
An adjustable focus telescope allows the distance between reticle and telescope objective to be adjusted for measurements made at other than infinity. Additionally, infinity can be set for different wavelengths of light.
Application examples:
■ Adjustment of optical and mechanical systems
■ Qualitative testing of image quality of optical elements and systems (additional collimator required)
■ Testing at different wavelengths of light
Notes on ordering:
■ Testing telescope eyepiece is commonly f=14,7 mm but can be equipped with eyepieces f=25 mm or f=10 mm on request.
■ One reticle and one eyepiece are included in the standard instrument.
■ The nomenclature of the focus adjustable telescope with straight viewing is as follows:
Important: Please specify reticle when ordering.
Small-size Apertures
Art. No.
Description
FL (mm)
CA (mm)
TE (mm)
FOV
Distance Range
L
227 501
FGV 90/40/14.7/±6
90
16
±6
6.0°
-∞...-1.25 m
+1.40 m...+∞
77±6
227 502
FGV 90/40/14.7/+12
90
16
+12
6.0°
+0.80 m...+∞
71+12
227 503
FGV 90/40/14.7/-12
90
16
-12
6.0°
-∞...-0.60 m
83-12
227 504
FGV 140/40/14.7/±6
140
28
±6
4.0°
-∞...-3.10 m
+3.30 m...+∞
77±6
227 505
FGV 140/40/14.7/+12
140
28
+12
4.0°
+1.70 m...+∞
71+12
227 506
FGV 140/40/14.7/-12
140
28
-12
4.0°
-∞...-1.40 m
83-12
CA = Clear Aperture FL = Focal Length TE = Tube Extension FOV = Field of View
Mid-size Apertures
Art. No.
Description
FL (mm)
CA (mm)
TE (mm)
FOV
Distance Range
A
B
L
227 507
FGV 300/65/14.7/±25
300
50
±25
2.0°
-∞...-3.40 m
+3.80 m...+∞
220
245
173±50
227 508
FGV 300/65/14.7/+50
300
50
+50
2.0°
+2.10 m...+∞
220
270
148+50
227 509
FGV 300/65/14.7/-50
300
50
-50
2.0°
-∞...-1.50 m
220
220
198-50
227 510
FGV 500/65/14.7/±50
500
50
±50
1.0°
-∞...-4.50 m
+5.40 m...+∞
310
360
198±50
227 511
FGV 500/65/14.7/+100
500
50
+100
1.0°
+3.00 m...+∞
310
410
148+100
227 512
FGV 500/65/14.7/-100
500
50
-100
1.0°
-∞...-1.50 m
310
310
248-100
CA = Clear Aperture FL = Focal Length TE = Tube Extension FOV = Field of View
Large-size Apertures
Art. No.
Description
FL (mm)
CA (mm)
TE (mm)
FOV
Distance Range
L
227 667
FGV 1100/105/14.7/±50 MDD
1100
78
±50
0.5°
-∞...-23.70 m
+25.80 m...+∞
202±50
227 668
FGV 1100/105/14.7/+100
1100
78
+100
0.5°
+13.20 m...+∞
202+100
227 669
FGV 1100/105/14.7/-100
1100
78
-100
0.5°
-∞...-12.00 m
202-100
CA = Clear Aperture FL = Focal Length TE = Tube Extension FOV = Field of View