今年5月7～8日,德国照相协会在科隆召开了会议,讨论的问题主要涉及银盐和非银盐照相材料,并对传统的银盐照相材料的前景进行了探讨。专家们提出了15篇论文。会议还讨论了窄电影胶片和电视胶片的不同优点。 7日晚,该协会向美国照相工艺理论家Jach W.Mitchell博士、美国电子闪光灯发明家和革新家Hazold On 7 and 8 May this year, the German Photographic Association held a conference in Cologne to discuss silver silver and non-silver photographic materials, and discussed the prospect of traditional silver salt photographic materials. Experts put forward 15 papers. The meeting also discussed the different advantages of narrow and film films. On the evening of the 7th, the association sent a letter to Dr. Jach W. Mitchell, a photographic art theorist from the United States, Hazold, an American flashlight inventor and innovator,