You can think of the Spotmatic F as the "Spotmatic Final." Released in 1973, it represents the culmination of the Spotmatic line of cameras. There was only one other Spotmatic to come along, before the advent of the K-mount cameras, the stripped-down Spotmatic 1000 of 1974.
Pentax really didn't have too much to improve upon by the time they got to the end of their Spotmatic series. The Spotmatic F retains all the excellence of the Pentax Spotmatic II with minor improvements; you won't find anything earth-shatteringly new in this camera. The most prominent of these upgrades is the Spotmatic F's ability to meter full aperture with the SMC Takumar lenses that Pentax had recently introduced. The new SMC Takumars had little tabs in the lens mount that communicated aperture info to the camera's meter, thus, no longer requiring stop-down metering... though, this was still necessary to do with the older Pentax lenses, even on the Spotmatic F.
In short, the Spotmatic F can be summed up by the saying, "If it ain't broke, make it a little bit better," and that's exactly what Pentax did.
Pentax Spotmatic F
There is beauty in simplicity.
Be it simplicity of design or simplicity of function, the Pentax Spotmatic F is a beautifully simple camera. Lack of complexity does not correlate to a lack of capability. The crafty and creative and competent photographer can go a long way with a Spotmatic F in hand.⠀
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Be you a purveyor of the beautifully simple or the simply beautiful, lend some attention to the Spotmatic cameras.
za/sd
Pentax Spotmatic F and the M42 Lens Mount
Meet the M42 lens mount, or at least meet a Pentax Spotmatic F which helped popularize this thread-based lens mount.
The early Pentax cameras so celebrated this mount that many call it the "Pentax Screw Mount", while in fact the M42 was introduced in the late 1930s by Carl Zeiss and later picked up by Praktica for their cameras, being called the "Praktica Screw Mount" for awhile.
Modern lenses use a bayonet style of mounting where the lens is rotated a fraction of a turn and locks in place. The M42 lenses literally screw into the body of the camera. Because of it's long history and universal appeal to a variety of lens and camera manufacturers (for awhile also being called the "Universal Thread Mount") you can find a huge array of optics available in M42, from early Zeiss to Takumar to Olympus and even Soviet and Russian lenses like this Jupiter-9 85mm f2, shown here on the Spotmatic body.
One last thing to point out about M42: as it is one of the smallest SLR mounts, you may adapt it to virtually everything else - from Nikon to Canon to mirror-less digital and beyond.