TESTING TELESCOPES FOCUS ADJUSTABLE – WITH 90°-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. The following figure shows the set-up of a focusable telescope with 90° viewing. In contrast to a telescope with straight viewing the image appears upright and laterally reversed.
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:
■ 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 instrument.
■ The nomenclature of the focus adjustable testing telescopes with 90°-viewing is as follows:
Important: Please specify reticle when ordering. Please specify direction of use if reticles with lettering are used so that the lettering will be right-side-up.
Small-size Apertures
Art. No.
Description
FL (mm)
CA (mm)
TE (mm)
FOV
Distance Range
A
L
227 541
FRV 90/40/14.7/±6
90
16
±6
6.0°
-∞...-1.25 m
+1.40 m...+∞
60±6
176,5±6
227 542
FRV 90/40/14.7/+12
90
16
+12
6.0°
+0.80 m...+∞
54+12
170,5+12
227 543
FRV 90/40/14.7/-12
90
16
-12
6.0°
-∞...-0.60 m
66-12
182,5-12
227 544
FRV 140/40/14.7/±6
140
28
±6
4.0°
-∞...-3.10 m
+3.30 m...+∞
60±6
176,5±6
227 545
FRV 140/40/14.7/+12
140
28
+12
4.0°
+1.70 m...+∞
54+12
170,5+12
227 546
FRV 140/40/14.7/-12
140
28
-12
4.0°
-∞...-1.40 m
66-12
182,5-12
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
227 547
FRV 300/65/14.7/±25
300
50
±25
2.0°
-∞...-3.40 m
+3.80 m...+∞
220
245
140±25
227 548
FRV 300/65/14.7/+50
300
50
+50
2.0°
+2.10 m...+∞
220
270
115+50
227 549
FRV 300/65/14.7/-50
300
50
-50
2.0°
-∞...-1.50 m
220
220
165-50
227 550
FRV 500/65/14.7/±50
500
50
±50
1.0°
-∞...-4.50 m
+5.40 m...+∞
310
360
165±50
227 551
FRV 500/65/14.7/+100
500
50
+100
1.0°
+3.00 m...+∞
310
410
115+100
227 552
FRV 500/65/14.7/-100
500
50
-100
1.0°
-∞...-1.50 m
310
310
215-100
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
227 556
FRV 1100/105/14.7/±50
1100
78
±50
0.5°
-∞...-23.70 m
+25.80 m...+∞
161±50
227 557
FRV 1100/105/14.7/+100
1100
78
+100
0.5°
+13.20 m...+∞
161+100
227 558
FRV 1100/105/14.7/-100
1100
78
-100
0.5°
-∞...-12.00 m
161-100
CA = Clear Aperture FL = Focal Length TE = Tube Extension FOV = Field of View