I found a solution to the poor quality of the photos from the original lens covers.
Of cusualidad I realized that the lens covers original is the same size as the lens covers a Iphone4
Here the tests and installed the lens covers...
With the original:
With Iphone4 lens covers:
Installed lens covers of Iphone4:
I found the lens covers in Mercadolibre with a price of $40.- (pesos argentinos) Aprox. 4 U$S