The Holga 120N was my entry into medium format. Prior to my return to film about 2 years ago, I knew nothing of things larger than 35mm. The Holga was an inexpensive way to learn. It features a zone focus plastic lens with symbols for Portrait, Single Person, Group, and Landscape. A switch selects different apertures for sunny or shaded, and the single speed shutter can be switched to bulb mode if you wish. Film advance is via a knob on top with a red window on the back of the camera.
I’ve found it works best with 400 ASA film, so I’ve loaded a roll of Portra 400 for the week.
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You can still buy them new. Mine came from Four Corner Store.