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10-15-2010, 05:52 PM   #1
Ole's Avatar

Join Date: Sep 2006
Location: Copenhagen, Denmark
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Asahiflex IIb

The Asahiflex IIb had no 'IIb' model designation on the body but was just labeled Asahiflex like the first models. This camera replaced the 'Ia' model and introduced the instant return mirror which was a major breakthrough: the view finder would no longer stay black after exposure. Asahi was the first company to introduce this feature commercially. The secondary eye-level viewfinder was retained although it now thanks to the new mirror mechanism was possible to follow moving objects through the waist level viewfinder.

The Asahiflex IIb came in three versions:

* An early version which had arrows on the top plate (see the first two photos)
* A middle version with triangles on the top plate (photos no. 3 and 4)
* A late version which was basically a IIa with the slow shutter speeds removed and a plug on the front panel where the dial for the slow speeds would otherwise have been (see the last photo).

Asahiflex IIb
Also marketed as
Tower 23
Year introduced
Year discontinued
Automatic aperture stop down
No meter
Exposure modes
Shutter speeds (manual)
B, 1/25, 1/50, 1/100, 1/200, 1/500s
Shutter speeds (mechanical)
B, 1/25, 1/50, 1/100, 1/200, 1/500s
Shutter dials
One, on the top plate
Self timer
Mirror lock-up
Multiple exposures
Film advance
Flash hot shoe
Flash contact
Two: One FP and one X contact on the front
Built-in flash
TTL/P-TTL flash
Flash sync speed
Flash exposure comp
Not applicable
Viewfinder type
1) Folding waist level, 2) Galilean eye-level
Instant return mirror
Diopter correction
Exchangeable screen
Depth of field preview
Image size
24 x 26mm

The secondary (eye-level) viewfinder matched a 50mm lens

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Last edited by Ole; 10-16-2010 at 10:31 AM.
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