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 Split-Image / Micro-Prism Focusing screen function explaim:  
A. MF-Lens:Using the manual focusing lens can assistance focusing. 
 B. AF-Lens: 
- Can check from the viewfinder window whether AF focus is accurate or not.
 - When Auto focus Fails can assistance focuse:
 - Low contrast / Solid color subjects.
 
 - Extremely backlit and reflective subjects.
 
 - Overlapping near and far objects.
 
 - Repetitive patterns.
   
  
  
    | Screens style  | 
    Picture  | 
    The camera of using  | 
    Central Construct  | 
    Matte  | 
    Note  | 
   
  
    | Ec-A | 
     
  | 
    CANON 1Ds/1D/1DMK2/MK3/1Dx  | 
    Micro Prism  | 
      Precision Matte  
      | 
    Canon Made      | 
   
  
    | Ec-B | 
     | 
    CANON 1Ds/1D/1DMK2/MK3/1Dx  | 
    Split-image  | 
    Precision Matte 
      | 
    Canon Made  | 
   
  
    | Ec-L | 
     | 
    CANON 1Ds/1D/1DMK2/MK3/1Dx   | 
    Cross Split-image  | 
    Precision Matte 
      | 
    Canon Made  | 
   
  
    | Ec-R | 
     | 
    CANON 1V/1NRS  | 
    
      Laser Matte 
      *AF lens uses 
      | 
    
      Laser  Matte 
      *AF lens uses 
      | 
     | 
   
  
    | F6-A | 
     | 
    NIKON F6  | 
    Split-image  | 
     New Hexagon Matte  | 
    Nikon Made  | 
   
  
    | F6-J | 
     | 
    NIKON F6  | 
    Micro Prism  | 
     New Hexagon Matte  | 
    Nikon Made  | 
   
  
    F6-L          | 
     | 
    NIKON F6  | 
     45 Degree Split-image  | 
    New Hexagon Matte  | 
    Nikon Made  | 
   
  
    | K-3 | 
     | 
    NIKON FM3A  | 
     | 
    Hexagon Matte  | 
    Nikon Made  | 
   
  
    | FSB | 
     | 
    N  | 
     | 
    Tradition Matte  | 
     N   | 
   
  
    | FSL | 
     | 
      | 
    
      45 Degree Split-image 
      Microprism 
      | 
    Tradition Matte  | 
      | 
   
  
    | FSX | 
     | 
      | 
     | 
    Tradition Matte  | 
      | 
   
  
    | A TYPE  | 
      | 
    CANON  | 
    
      AF standard matte  
      *AF lens uses 
      | 
    
      AF standard matte 
      *AF lens uses 
      | 
    Canon Made   | 
   
  
    | S TYPE  | 
      | 
    CANON  | 
    
      Super precision matte 
      Eg-S 
      | 
    Super precision matte  | 
    Canon Made   | 
   
 
  
Various focusing screens focuses image : 
1.Ec-A Focusing Screen 
  
<P.1>Lost focus image.
(The focus  in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image
(The focus  in the hand.) 
  
  
<P.4>The central image enlarges. 
  
2.Ec-B Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
3.Ec-L Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
4.Ec-R Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
5.F6-A Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
6.F6-J Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
7.F6-L Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
8.K3 Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
9.FSB Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
10.FSL Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
11.FSX Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
12.A Type Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
13.S Type Focusing Screen 
  
<P.1>Lost focus image. (The focus in the house of back.) 
  
  
<P.2>The central image enlarges. 
  
  
<P.3>Focus Image (The focus in the hand.) 
  
  
<P.4>The central image enlarges. 
  
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