Praktica's final B-bayonet SLR — the BX20s, aperture-priority auto, LED finder, electronic, 1990.
The Praktica BX20s is a 35mm film SLR from Pentacon in Dresden, Germany, from around 1990, a revised version of the BX20 and one of the last cameras of the Praktica B bayonet system as East German production wound down around reunification. It sat near the top of the B range as a late refinement of the electronic bayonet Prakticas.
It is a Praktica B bayonet SLR with an electronically controlled vertical-travel metal focal-plane shutter. The BX20s offers aperture-priority automatic exposure with through-the-lens open-aperture metering and manual operation, and displays exposure information via an LED readout in the pentaprism finder. Being electronically timed, it depends on its battery to fire and meter correctly.
The BX20s suits students, general users and enthusiasts wanting a late, fuller-featured B body with aperture-priority auto and an LED finder. It handles conveniently with open-aperture metering and modern controls; as with the rest of the B line, the lighter construction and the narrower B lens range are the trade-offs against the older all-metal M42 cameras.
On the used market, treat this as an electronic camera: test with a fresh battery across auto and manual, since a flat cell can stop it firing or misexpose. Confirm the LED finder display works, inspect foam light seals and mirror-damper foam for perishing, and check the meter and aperture-priority auto respond sensibly. Examine the prism for desilvering, verify the bayonet contacts are clean, and test film advance, rewind and screen condition.