Olympus Pen EE-3
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In 2009, Olympus introduced the PEN E-P1, a Micro Four Thirds system digital camera which the company touts as the next-generation Pen camera.
The Pen EE was introduced in 1961 and was the amateur model, with fully automatic exposure and fixed focusing. It is a true point and shoot camera, and has a 28mm f/3.5 lens. The Pen EE family is easily recognized by the selenium meter window around the lens.
The Pen EE.S, launched in 1962, is the same model with a 30mm f/2.8 and a focusing ring, made necessary by the wider aperture.
In 1966 the two cameras were slightly modified and became the Pen EE (EL) and Pen EE.S (EL) with a modification of the take-up spool to make film loading easier. EL stands for Easy Loading. You can only recognize them by a small label marked EL stuck on the front, or you can open them and look at the take-up spool.
The Pen EE.2, produced from 1968 to 1977, is nearly the same as the Pen EE with the addition of a hot shoe. The Pen EE.3, produced from 1973 to 1983, seems to be exactly the same camera.
The Pen EE.S2, produced from 1968 to 1971, is the same as the Pen EE.S with the addition of a hot shoe. EES-2's User Manual in English
The Pen EE.D, produced from 1967 to 1972, is a more expensive automated-exposure model, with a CdS meter, a 32mm f/1.7 lens and a hot shoe.
The Pen EF, launched in 1981, was the last Pen model. It is like the Pen EE.2 or Pen EE.3, but with a small built-in flash, and was only sold in black finish with white letterings.