The Yashica DF-10S is a great snapshot 35mm camera from the Yashica/Kyocera era. It's quite unique in that it offers a two lenses in a 'focus-free' configuration.
Here's how the focus-free design works:
In daylight, subjects at 1.5 meters and beyond should be in focus with the wide angle lens (2 meters and beyond for the telephoto mode). For daylight flash photos, this table gives you the ideal focus:
Yashica/Kyocera sold a nearly identical camera called the DF-10 which omitted the self-timer mode.
This camera requires two AA batteries (not included).
Condition Notes We film tested this camera and it delivered sharp, correctly exposed photos. We saw slight light leakage on the film sprocket edges but we decided against adding baffling because it was nowhere near the image area. The overall cosmetic condition is good except for some paint wear (see photos). The original case is included.
Lens: Yashica lens, 35 mm F5.6 at wideangle, 55 mm F8.5 at telephoto (motorized automatic switchover).
Lens Barrier: Opens and closes with lens barrier lever.
Shutter: Electronic Shutter (1/125 sec. ...wideangle, 1/60 sec.... telephoto).
Shutter Release: Electro magnetic release.
Focusing: Fixed focus, 1.5 m—oo shooting range at wideangle, 2.0 m—oo at telephoto.
Exposure Control: Normal exposure ... F7.2 at wide-angle, F11 at telephoto.
Flash photography (ISO 100)... F5.6 at wideangle, F8.5 at telephoto.
Exposure Metering: CdS cell. An underexposure warning lamp turns on in dim light (under about EV 10.5, ISO 100).
Film Speed Setting: Automatic with DX films (ISO 100—400). The film speed is automatically set to ISO 100 with non-DX films.
Viewfinder: Albada type bright-frame finder, automatic magnification switchover by switching lenses.
Display in Viewfinder: Picture area frame (with parallax correction marks).
Display Panel: Exposure counter and flash mark
Film Loading: Automatic loading (the film automatically advances to the first frame).
Film Advance: Automatic.
Film Rewind: Auto return/auto stop. The film can be rewound in the middle of a roll with a manual rewind button.
Exposure Counter Auto resetting, additive type. Built-in Flash: Flash mode set with the mode button, fixed flash head; about 1—2.5 m flash range at wideangle. about 1.2—2 m at telephoto (ISO 100); about 4 sec. flash recycle time (with new alkaline-manganese batteries, at normal temperature — according to Yashica testing standards).
Batteries: Two 1.5 V AA-size batteries provide power for exposing about 25 rolls of 24-exposure film when 50% of the pictures are taken with flash (with new alkaline-manganese batteries, at normal temperature — according to Yashica testing standards). Nickel-cadmium batteries cannot be used.
Dimensions & Weight: 124(W) x 75.5(H) x 49(D) mm, about 280 g. (Without Battery)
Self-timer (for DF-10Sonly): Electronic self timer with about 10 sec. delay; self-timer lamp: cancelable in mid-run.