>>4479752
Thank you. I understand now. That's the naming because Tiffen manufactures the filters under the wratten system.
Here's some that I researched when it comes to clear filters:
Tiffen 2A cuts out at 400-405mm.
Tiffen 2E cuts out at 415-430nm. Only 77mm seems to be available.
Kolari UV cuts out at 415nm.
B+W 010 cuts out at around 350nm. They also have 486 UV/IR Cut filter, that is stronger and cuts at around 380nm for ultravilet, but I don't think that is sufficient.
Zeiss T* UV cuts out at around 405nm.
>>4479736
>with the magic of digital editing,
I want to correct the fringing for video, so this must be done optically foremost, the tools for video aren't that readily available and cameras certainly can't correct this type of longitudinal chromatic aberration automatically.
>>4479572
Lenses usually aren't designed to focus the ultraviolet spectrum well, and because the spectrum isn't clear cut some of it bleeds into the blue region. While glass will filter out UV-B (280-315nm) spectrum, UV-A (315-400nm) is left intact. Strong coatings make for unwanted color casts, so I guess even if lenses are coated to avoid ultraviolet, it's usually not that agressive so the violet-blue colouring doesn't get destroyed. The smaller the optical system, the more pronounced these aberrations are and with strong contrast between the subject and the background they can really ruin a picture. If you want greater filtering, the solution is to get a dedicated filter. That's how I see it.
