S2 paraxial camera, and Konica Auto
S2 uses a 45mm
F1.8 lens. This lens is a lens with double Gaussian symmetry structure and belongs to a large aperture high-speed lens. At that time, it did not have imitation ability, so four sets of 5mm
F2.8
Tessar lenses were used. The structure is simple, the central part has a very high resolution, but the resolution around it drops sharply, and there is a focus drift phenomenon under different apertures. This kind of lens can take very good photos with a small aperture, but the imaging under a large aperture is poor.
I have used two 25s, namely, Phoenix 25B (Phoenix 25 and Seagull 25 come from the same door and have the same structure, only the manufacturers are different) and Seagull 25, and the films produced by the two cameras are similar. Patching a small landscape has a good image quality, but the overall resolution is low, so the photos can't be magnified and scrutinized, and it is difficult to create a blur effect of large aperture and shallow depth of field. In addition, paraxial shooting has a focus parallax, which requires a while to master the shooting skills.
Generally speaking, this camera, as a witness of the development of camera industry in China, is memorable, but it is not very useful to take pictures.