Transparent protection filter

Hoya has not been sold to a Chinese brand. It is true that they don't make all their filters in Japan; their cheapest UV filters are made in the Philippines. For protection filters, the best brands are Hoya and B+W.

Here are two great websites with advanced technical tests of various filters:

• http://camera-filters.biz/uv_filters/
  
• http://www.lenstip.com/113.4-article-UV_filters_test_Description_of_the_results_and_summary.html