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Pentax Interchangeable Viewfinders

The Pentax LX features a complete system of interchangeable viewfinders. The fact that the camera features IDM metering leads to three very desirable consequences:

All viewfinders show the entire viewing screen as well as the information LEDs on the right side.

Table 1. Pentax LX Interchangeable Viewfinders.
Viewfinder Catalog
Number
Magni-
fication
Diopter
Range
Eyepoint
(mm)
Weight
(g)
Laterally
Correct
Image
Visible
Aperture
Flash
Hotshoe
FA-1 Eye-Level Finder 30961 0.90 -1.5 ~ 0 15.8 95 yes yes yes
FA-1W Eye-Level Finder 30963 0.80 ~ 0.88 -3 ~ +1 15 95 yes yes yes
FA-2 Eye-Level Finder 30962 0.90 -1.5 ~ 0 15.8 86 yes    
FE-1 Magni-Finder 30965 1.35 -5.0 ~ +4.0 20 152      
FF-1 Waist-Level Finder i 30966 1.05 -1.1 15 72      
Viewfinder Base ii Catalog
Number
Magni-
fication
Diopter
Range
Eyepoint
(mm)
Weight
(g)
Laterally
Correct
Image
Visible
Aperture
Flash
Hotshoe
FB-1 System Finder Base 30964 131
Viewfinder Eyepiece iii Catalog
Number
Magni-
fication
Diopter
Range
Eyepoint
(mm)
Weight
(g)
Laterally
Correct
Image
Visible
Aperture
Flash
Hotshoe
FC-1 Action Eyepiece iv 30981 0.55 -0.95 60 131 yes yes  
FD-1 Magni-Eyepiece 30982 0.95 -4.5 ~ +3.5 15 143 yes yes  
FD-2 Standard Eyepiece 30983 0.84 -1.0 15 43 yes    

i = When not in use, this viewfinder can be folded up almost completely flat.
ii = The viewfinder base must be used in conjunction with one of the viewfinder eyepieces.
iii = The viewfinder eyepieces must be used in conjunction with the viewfinder base.
iv = This eyepiece can be turned at 180°, thus useful both as a waste-level and eye-level finder.