The camera filters, are an excellent value, compared to many similar Tiffen and Hoya Multicoated camera filters; Sunpak DHG filters are made of solid optical glass in Japan. The rings on the DHG filter products are as good as any world class filter maker. Quality has always been very important to us, at The Filter Connection / 2filter.com. We think Sunpak DHG camera filters are worthy of your comparison. The Tech People at 2filter.com