History. Zeiss, now known for lenses, made cameras until the 1970s. Their medium format folding cameras were mostly sold under the name Ikonta starting before World War II. There were many different formats and lens options over the years. Certo6, who restores folding cameras, has an excellent introduction to the different models.
The Super Ikonta III and IV were the last models produced, from the mid-50s until around 1960. The IV is a III with a built-in light meter.
I found an Agfa Isolette at a local vintage store which I restored and used. I like the size and the quality of the pictures. I didn't like the "guess the distance" zone focusing. I sold the Isolette and bought a restored Super Ikonta III. I've been using it for five years, and like it so much I bought a second two years ago.
I'll talk about my particular camera - with a a 3-element Novar lens, and Synchro-Compur shutter - in this review. Because there were many variations over the years individual models may have different features or specs.