The FTb was primarily intended to be a camera for the advanced amateur photographer, offering many of the same features and same build quality as the F-1, but without the option of interchangeable prisms, focusing screens, or motor drives.

Finally, a shutter speed display was added in the lower left hand corner of the viewfinder.

It is fully coupled to shutter speed dial and aperture ring on FD lenses in the match needle style.

While these batteries are obsolete, modern replacements include the Wein zinc-air cell PX625, available at large online retailers.

Alternative options for replacement are to use a 1.5 volt silver battery either through a voltage dropping adapter or recalibrating the meter.