Recently I was looking for some used 85A filters to shoot tungsten film outside. My primary consideration are ones made by Hoya because they are good quality, abundant and relatively inexpensive. But I would prefer those that have multi-coating.
Some older Hoya filters (those with older Hoya logos) have the HMC marking on them, like modern ones, but most others do not.
Any idea what type of coating do older non-HMC-marked Hoya filters have?
Hoya had many different packaging designs and several different logos over the years. Some filters have HMC marking, some don't, and some have things like "This filter is coated on both sides" written on the packaging. It's all a little confusing. Were any of the non-HMC-marked filters actually multi-coated?