This is a good thread

. We are really getting into it now!!
I thought cheap tiffin filters were for protection. Not to be used during exposure. There “UV” filter is uncontested and like 7-10 bucks. Maybe 20.
There are filters Co.’s out there that have more strict standards for production, but cost more.
You get what you pay for!
I still use drop in series 6 filters on Zeiss Ikon Nettar. Uncoated triplet, where I machined a slip on step up filter ring to bridge the smaller dia. Of the Nettar, to series 6 drop in. It also has a lens shade.
It’s all the same to me.
However for my 67mm filters for LF. I have and do use a B+W multi coat. But I only bought one. I just buy lenses that have a 67mm . Fujinons. 210,250,300L,420L
But these lenses are all single coated.
One half dozen, or “six” to others???? Doesn’t make a real difference to me.
But then again, I just might have low standards, or poor quality of judgement and discernible taste.
Maybe somebody needs to take me to school. And show me “the real way” to make exposures

