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The OPTITEST line offers a comprehensive choice of reticles to meet any
conceivable application. Custom glass reticles made to your specification
also can be supplied in our instruments. The reticle combination used in
an optical instrument is depends on application and the experience of the
user. However some general rules and recommendations presented below are
intended to help the user to solve this problem.
General rules and recommendations
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A bright cross reticle is especially suitable for applications where the light conditions are not optimal e.g. small reflector for autocollimation, long distance between autocollimator and reflector, AR-coated surfaces, etc. For any other applications a dark cross reticle is preferred.
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For same application, the use
of instruments with longer focal length (smaller numerical aperture)
will worsen the light conditions. Therefore always use cross
reticles with thicker lines when focal length
increases. |
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The accuracy of reading
increases when between two superimposed reticles (in symmetrie
position) a small bright gap is left. The thickness of a
dark/bright cross or a single/double cross combination should be
selected correspondingly. |
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The use of bright cross
reticles (known also as dark field reticles) in eyepiece is not
recommended since the observation of the collimator reticle is
difficult. |
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In the instruments with 90°-viewing using reticles with scales, the correct (errected) position of the scale numbers depends on the working position i.e. horizontal or vertical assumed by the assembly of the instrument. Therefore the working position of these instruments must be specified when ordering.
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Cross line (hair) reticles
Applications
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Alignment of mirrors and
optical systems |
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Precision measurement of
angles in combination with eyepiece micrometers
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Radius measurement of cylindric surfaces |
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Measurement of centration
errors |
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Ideal for PC-controlled angle
measurements
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Recommendations
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Eyepiece reticles: double
cross line |
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Collimator reticles: single
cross line |
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Preferred
combinations:
RET-24/RET-02
RET-24/RET-12
RET-24/RET-13
RET-02/RET-12
RET-22/RET-01
(f?300mm)
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Single Cross Line(Hair) Reticles
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| CODE |
Type
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Line width
(mm)
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Dia.
(mm)
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| RET-01 |
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0.010
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12
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| RET-02 |
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0.020
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| RET-04 |
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0.040
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| RET-82 |
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0.020
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25
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| RET-85 |
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0.050
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| RET-11 |
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0.010
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12
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| RET-12 |
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0.020
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| RET-13 |
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0.030
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| RET-15 |
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0.040
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| RET-86 |
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0.020
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25
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| RET-87 |
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0.050
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Double Cross Line (Hair)
Reticles
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| CODE |
Type
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Clear
space
(mm)
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Dia.
(mm)
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| RET-22 |
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0.020
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12
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| RET-24 |
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0.040
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| RET-26 |
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0.060
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Reticle with angle
graduated scales
Applications
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Tilt measurement in
conjunction with a reflector attached to the object under test |
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Angle measurement of optical
components like prisms, windows, etc.
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Recommendations
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Eyepiece reticles: angle graduated scales |
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Collimator reticles: single
cross line: RET-02 (RET-01, RET-12, RET-04)
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Preferred combinations: Angle
graduated scales/RET-02 |
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Angle graduated scales
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| CODE |
Range of graduation
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Smallest division
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Estimation
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Designed for
instrument
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| RET-30 |
±75min
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60sec
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20sec
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ACM100
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| RET-31 |
±50min
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30sec
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15sec
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ACM150
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| RET-32 |
±30min
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10sec
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ACM200
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| RET-33 |
±25min
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ACM300
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| RET-34 |
±12.5min
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15sec
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5sec
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ACM500
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| RET-39 |
±7.5min
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5sec
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1.5sec
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ACM1000
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Reticle with special angle
graduations
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| CODE |
Range of graduation
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Smallest division
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Estimation
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Designed for
instrument
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| RET-40 |
±20¯
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1¯
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0.5¯
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ACM100
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| RET-42 |
±12¯
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0.5¯
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0.2¯
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ACM200
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1¯=1/6400 of full circle
Reticle with angle
tolerances
Applications
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Fast checking of wedges and
plane-parallel plates |
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Alignment of optical systems |
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Measurement of radii of
curvature
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Recommendations
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Eyepiece Reticle: RET-50, RET,
51 |
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Collimator Reticle:pinhole with cross RET-53...59 |
Preferred
Combinations
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RET-50/RET-59 |
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RET-51/RET-53...RET-58 |
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| CODE |
Type
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Range of
graduation
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Designed for
instrument
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| RET-50 |
9 concentric circles graduated for TILT
measurement (positive type)
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1, 2, 3, 4, 5, 7.5, 10, 15, 30 min
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ACM200
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| RET-51 |
9 concentric circles graduated for WEDGE
measurement (positive type)
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| RET-53 |
pinhole with cross for WEDGE measurement
(negative type)
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30/60sec
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| RET-54 |
1/2min
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| RET-55 |
1.5/3min
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| RET-56 |
2/4min
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| RET-57 |
2.5/5min
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| RET-59 |
pinhole with cross for TILT measurement
(negative type)
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30/60sec
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ACM200
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Resolution Tests
Applications
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Testing image quality of optical systems
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Adjustment and setting of optical instruments |
Recommendations
The resolution tests are always used as collimator reticle. When used in autocollimators, the eyepiece reticle should be a single cross.
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| CODE |
Type
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Dia.
(mm)
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| RET-61 |
Siemens Star 2x36 segments Resolution 8.7µm
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12
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| RET-62 |
Siemens Star with crossline 0.02mm 2x30
segments Resolution 10.4µm
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| RET-63 |
USAF Resolution Test lpm 0.504...0.0044
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| RET-67 |
Siemens Star 2x36 segments Resolution 8.7µm |
25
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| RET-68 |
Siemens Star 2x36 segments Resolution 8.7µm
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Further resolution tests are available on request.
lpm=line pairs
per mm
Scales in mm and
further reticle patterns used in optical testing
Applications
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Measurement of optical
parameter:
focal length: RET-73, RET-74, RET-91
centration
errors: RET-71, RET-90
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Alignment of optical systems:
RET-76, RET-77, RET-92 |
Recommendations
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Eyepiece Reticle: mm scales |
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Collimator Reticle: Porro
plates, slits patterns,
etc. |
Preferred
combinations
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RET-71/RET-13(RET-02) |
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RET-91/RET-13 (RET-02, RET-86) |
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RET-02/RET-73
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| CODE |
Type
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Dia.
(mm)
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| RET-71 |
Crossed ±4 mm scale.Range ±4mm Division 0.1mm
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12
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| RET-73 |
Porro plate. Distance between line pairs:
2/4/6/8mm
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| RET-74 |
4 slits pattern, negative type.Width:
0.24/0.8mm Distance: 2.4/8mm
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| RET-75 |
2 slits pattern, negative type. Width 0.08mm,
Distance:0.5mm
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| RET-76 |
Circle with cross, negative type.Diam. 0.8mm,
crosslines: 0.02mm
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| RET-77 |
Pinhole with positive cross, Dia. 0.5mm,
crosslines: 0.01mm
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| RET-78 |
Cross with circle, positive, Dia.: 1mm,
crossline: 0.02mm
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| RET-90 |
Crossed ±5 mm scale.Range ±5mm Division 0.1mm
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17
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| RET-91 |
10mm Scale in 500 divisions. 1 div.: 0.02mm
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15
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| RET-92 |
Cross with concentric circles. Dia.: 1, 2, 3,
4, 5, 7.5, 10, 12.5 and 15mm. Linewidth: 0.015 mm
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25
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Products > Autocollimators and visual optical instruments > Reticles
