Canon T 90 - Manual (Page 201)

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2 )
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Notes
“ o o " is displayed.
lens from “A” mark.
In the case of out-of-metering range warning
(low) and underexposure warning, the maxi­
mum aperture of the lens in use blinks in the
viewfinder. When the FD 200 mm f/2,8 is
used, “2.8” will blink in the viewfinder,
When using a lens with a minimum aperture
of f/16 such as the FD 50 mm f/1 2L, the aper­
ture displays of “16'' and “19" also indicate
overexposure warning. In this case, please
note that the aperture does not blink in the
viewfinder.
When using a lens with a minimum aperture
of f/32 such as the FD 135 mm f/2, exposure
will be correct even if the aperture display of
"27” is blinking in the viewfinder. When “32"
starts blinking, however, your picture will be
overexposed.