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2.8  CF Lens and Protective Window 
The optional  CF  lens  allows  the  measurement  of very 
small objects  and can be  used  in combination  with  all 
LT, 1M, 2M, 3M and 4M models. The minimum spot size 
depends  on  the  used  sensing  head.  The  distance  is 
always  measured  from  the  front  edge  of  the  CF  lens 
holder or laminar air purge collar.  
The installation on the sensing head will be done by turning the CF lens until end stop. To combine it with the 
massive housing please use the version with external thread M12x1. 
 
Versions Overview: 
CF lens for installation on sensing head [LT] 
CF lens for installation on sensing head [1M/ 2M/ 3M] 
CF lens with external thread for installation in massive housing [LT] 
CF lens with external thread for installation in massive housing [1M/ 2M/ 3M] 
 
For protection of the sensing head optics a protective window is available. The mechanical dimensions are 
equal to the CF lens. It is available in the following versions: 
Protective window for installation on sensing 
head [LT] 
Protective window for installation on sensing 
head [1M/ 2M/ 3M] 
Protective window with external thread for 
installation in the massive housing [LT] 
Protective window with external thread for 
installation in the massive housing [1M/ 2M/ 3M] 
Typical Transmission values* if the 
protective window is used (average 
values): 
LT    0,83 
1M/ 2M/ 3M  0,93 
4M    0,92            * deviations possible 
Typical Transmission values* if the CF lens is 
used (average values): 
 
LT  0,78 
1M  0,80 
2M  0,87 
3M  0,92 
4M  0,93     * deviations possible 
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information@itm.com1.800.561.8187