The Seagull 4B cameras are a series of TLRs made by Seagull. The actual model 4B-1 supports 6×6 and 4.5x6 format and is Seagull's entry level TLR. It has just a knob for film advance.

Chinese TLRs (and "pseudo TLRs")
Bedfordflex | Binaflex | Cangle | Dalian | Eastar
Emei | Five-Goats | Halina A1 | Halina Prefect
Halina Viceroy | Hongmei-5 | Hua Ying
Hua Zhong | Mirroflex II | Mudan | Pearl River
Qingdao SF-2 | Rainbow | Seagull 4
Seagull 4A | Seagull 4B | Seagull 4C
Seagull 4D | Shanghai | Splendidflex
Temple of Heaven | Tianjin Eastar | Traveller
Wuhan Youyi | YC-75X100
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It features a sports finder, focusing loupe and horizontal split-image focusing aid. Transport and shutter cocking are independent of each other, making double exposures easy. Film transport is controlled via two red-eye windows, each for the respective taking format. The windows open simultaneously.

Shutter speeds range from 1/1-1/300 and B. Features a cold shoe and a PC sync port.

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