Etude dio-projector. Made by FED.
They were the list expensive projectors for standard size frame. And they were most famous from only few models what was available for armatures. Etude projectors were very simple. Totally mechanical with only ON/OFF switch. Frame can hold 2 slides. So you can see one slide while changing another. Casing was made from cast metal, and virtually indestructible. Condenser and lens made from real glass, and they can operate with 150 watts bulb on screens up to 3m in diagonal.Very important they were small in size and portable. So you can take them to show pictures to your friends and relatives. Quality of the pictures was OK at the best, and when you change slides you always have risk to burn fingers, but fun to show slides developed by hands was limitless!
They were the list expensive projectors for standard size frame. And they were most famous from only few models what was available for armatures. Etude projectors were very simple. Totally mechanical with only ON/OFF switch. Frame can hold 2 slides. So you can see one slide while changing another. Casing was made from cast metal, and virtually indestructible. Condenser and lens made from real glass, and they can operate with 150 watts bulb on screens up to 3m in diagonal.Very important they were small in size and portable. So you can take them to show pictures to your friends and relatives. Quality of the pictures was OK at the best, and when you change slides you always have risk to burn fingers, but fun to show slides developed by hands was limitless!