steep price, but it is necessary

Because a filter in front of the lens at least makes me a peace of mind when I think of the contamination of the lens from dust grains and flying particles that need to remove it.
So I think it's imperative before my lenses to wear protective filter to the danger from resulting cleaning scratches least the budget for substitute significantly reduce.

For this filter, I must say that the purchase is worthwhile even in this proud purchase price and I can continue to have a clear conscience.
The filter impairs the recordings and their quality on Canon 70-200mm f4 L IS USM in any way.
The colors are not washed out and the focus does not suffer from the filter attachment.

At the filter itself, everything is meticulously crafted. The thread is accurate and that the wording of the glass wobbles no, everything budge.