Blurry edges are often the result of the Xenvo lens not being accurately centered over the device’s camera.
By carefully positioning the Xenvo lens so that your device’s camera is precisely in the center of the Xenvo lens, you can often greatly reduce or eliminate edge blurriness.
Looking at the camera through the front of the Xenvo lens while you are positioning it on your device makes it easier to see when the Xenvo lens is properly centered. We have added a crosshair to the circular base of the lens clip to aid in getting the lens quickly and accurately aligned.
Another factor to consider is that the macro lens has a very shallow depth-of-field. This means that there is a very small range of distance from the lens where things will be in focus and as an object gets farther away from this distance, it will become out of focus very rapidly.
Shallow depth-of-field is inherent to macro photography and serves to create strong distinction between the sharply in-focus subject and the very out-of-focus background. Another way to say this is that it causes your subject to really pop out from the background. However, it can also present challenges in composing your shots that require experimentation and varying camera position until you achieve a desirable result.
Galen Michel