The Kora is a lute harp common to west africa, hope this helps!
        
             
        
        
        
Answer:
An OLED is an abbreviation for Organic Light-Emitting Diodes.
Explanation:
It is basically a type of light-emitting diode or LED that has an emissive electroluminescent layer that acts as a film of organic compounds and is responsible for emitting light when an electric current is applied.
 
        
             
        
        
        
1- use sharpest aperture
2- switch to single point focus
3- lower iso
4- use a good quality lense
5- remove lense filters
6- check sharpness on lcd screen