Quality Loss

The Skylighfilter be intended for outdoor photography in the day as the standard filter and protection. For wide-angle shots of landscapes with no special offers Details of filters at magnifications up to A5 size no abnormalities. However, once at the telephoto end specific detail relevant subjects are photographed (eg. Wildlife photography), a very noticeable loss of sharpness can be determined. For me, the filter is absolutely unacceptable in the telephoto range with requirement to detail.
Conclusion:
- Filter quality as bad as sharpness result is reduced too much, used that (Blur rub eg Vaseline) to me only as an effect filter. For this kind of "creative use" but too expensive.
No purchase recommendation!