PRISMS & LENSES
 
Dove Prisms  

These prisms have an interesting property If looked through the prism and rotated about its longitudinal axis, the image rotates through an angle twice as much as that of prism.

 
 

Specifications  
Material BK-7
Tolerance
dimensions 0.2mm
angle 3 arc mins
pyramid 5 arc mins
Surface finish
quality 60/40
flatness /2
Coating Entrance and exit surface may be provided with AR coating if desired.
   
Size(mm)
Product No.
A B C D
10.00 42.25 10.00 14.15 75237
18.00 76.00 18.00 25.45 75238
25.00 105.70 25.00 35.40 75239



   
45 REFLECTION PRISMS  

These prisms are five sided prisms. They reflect light rays through an angle of 90 by reflections. They do not invert or revert the image. The reflecting surfaces are aluminised.These prisms also shorten the length of an instrument.

Specifications
Material BK-7
Tolerance
dimensions +0.2mm
angle: + 5 arc mins.
Surface
quality 60/40
flatness /2
Coating

Larger reflecting face aluminised with SiO2 over coating and protected by black paint. Entrance and exit surfaces may be provided with AR coating if desired.

   

Size(mm)
Product No.
A B C
19.00 19.00 32.50 75242
40.00 25.00 43.00 75243

 








 
30 -60 -90 Littrow Dispersion/reflection Prisms  

These prisms have 30 -60 and 90 angles and, when uncoated,are used to disperse white light into spectrum . These are also used to reflect the beam by 60 angle without inverting or reverting the image when the larger surface is coated.

 
 

Specifications
Material BK-7
Tolerance
dimensions +0.2mm
angle + 5 arc mins.
Surface finish
quality 60/40
flatness /2
Uncoated Used to disperse white light into its spectrum.
Coating

Surface B is coated with AlSiO and protected with black paint. It diverts the beam by 60 angle without inverting or reverting the image.

Size(mm)
Product No.
A B C Ucoated coated
12.70 21.90 12.70 75292 75301
22.00 37.90 22.00 75293 75304




   
   
 
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