Apexel 18 mm wide angle lens Review and samples with Mi 5

Apexel 18 mm wide angle lens

Specifications:
Brand: APEXEL
Magnification Ratio: 0.63X
Lens Coatings: Multi-layer broadband ar
Lens Construction: 5 elements in 4 groups
Resolution(axis): 250 LP/MM
Resolution(corner): 150 LP/MM
TV Distortion <0.5%
Dimensions(main body): 1.38inch (diameter) x 1 inch (length)

Package Includes:

1 x 18MM 0.63x wide angle lens
1 x universal clip
1 x Lens cap
1 x storage case
1 x Lanyard
1 x user manual

with retail box

Review:

It does its job perfectly.

Pro:
1. Super wide angle view. (Attached Images Before/After)
2. Good build quality of body and clip
3. Nice lens glass quality.
4. Less distortion5. No fear of lens falling.

Cons:
A Black boundary in images in my Xiaomi Mi5 camera.

Samples:

Before/After