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日产幸福牌G70型彩色放大机,在国内已拥有众多用户,并担负着大量的放大任务。然而,因它原属于业余型机种,采用100W灯泡为光源,亮度较弱,对于大量加工的中等幅面照片,曝光时间嫌长、工效较低。为了提高工效,用135底片放制为数较多的10英寸及10英寸以下的照片时,宜采用F75mm镜头,同样光圈时,其亮度将比采用F50mm镜头高出一倍,曝光时间即缩短一半。小画面底片用较长焦距镜头时,正利用其最佳结象部位工作,因此画面照度均匀性大为改善,例用f5.6的光圈,就能取得F50mm镜头f8光圈的效果。随着彩色摄影应用范围的迅速扩大,目前,放制大幅照片的社会需求,日益增长。G70型放大机135底片全幅投影,在机台平面只能放至20英寸照片。如果放20英寸以上照片,必须倒转机身向地面投影,或者向墙壁投影。该机转身之后,其操作板
Nissan happiness card G70-type color amplifier, has many users in the country, and is responsible for a large number of amplification tasks. However, due to its original amateur aircraft models, the use of 100W light bulb as the light source, the brightness is weak, for a large number of medium-format photos processed, the exposure time is too long, low efficiency. In order to improve ergonomics, with 135 negatives to produce a larger number of 10 inches and 10 inches below the photos, it is appropriate to use F75mm lens, the same aperture, the brightness will be twice as high than the F50mm lens, exposure time is reduced by half. Small-screen film with a longer focal length lens, is using its best part of the junction work, so greatly improve the illumination uniformity of the screen, for example f5.6 aperture, you can get f50mm lens f8 aperture effect. With the rapid expansion of the range of color photography applications, there is a growing social need to release large photos. G70-type amplifier 135 film full projection, the plane can only be put in the plane to 20-inch photos. If you put more than 20 inches of photos, you have to flip the fuselage to the ground projection, or to the wall projection. After turning the machine, its operating panel