CPL for video. Should I spend $70-100??

I really cant justify spending that much money for a CPL. Id honestly rather buy an external monitor or a few cheap vintage lenses.

So im finding my self in a dilemma. Does it really make a difference for video specifically whether you have a cheap or expensive CPL???

I tried looking for comparison videos on youtube but no luck.

I just dont understand why some CPL filters are better than others. I dont really care about build quality, as long as the filter does what its supposed to.

Cheap filter=blurry image.

Some differences you will see in 'somewhat challenging' circumstances, some you might not notice unless you bothered with a formal comparison!

Flare outdoors: when sun is casting light directly onto the filter surfaces, you can tell a cheap filter with cheap coatings vs. a quality filter with quality coatings
Flare indoors: when you have a bright light source seen by the lens within the Field of View, against an otherwise dark background, you can tell a cheap filter with cheap coatings vs. a quality filter with quality coatings
Distortions: I have seen a polarizer acting like a PRISM, and as you spin the polarizer the scene shifts around!
Effectiveness and loss of light: Polarizers use a 'foil' to do the polarization. Foils come in different qualities of effectiveness, and some foils can cause greater or lesser amounts of fundamental attentuation of light (even ignoring the polarization effects)

You can look at test results and see that foils vary in their ability to cut of undesired light.
https://www.lenstip.co​m/index.php?art=139

Look into “fixed” filters and stack them as needed. Personally, I didn’t like using a cpl, couldn’t put the sun shade on the lens. Lots that I didn’t like about shooting video with a dlsr.

Hows this one?

https://www.bhphotovid​eo.com …_Circular_Polar​izing.html

My apologies. I used a variable ND filter, not a CPL. I didn't care for the filter because I didn't have access to it while the lens shade was on, or maybe I couldn't even put on the lens shade.

I have several Hoya HD CPLs. From what I can read, the HD series offers thinner filters with higher tensile strength. Overall, can't go wrong with Hoya as a brand. There are more expensive models that can have special coatings and thinner profiles to eliminate any potential vignetting with wide angle lenses.

PJmak wrote in post #18549673
Hows this one?

https://www.bhphotovid​eo.com …_Circular_Polar​izing.html

The one you linked is an UNCOATED Hoya filter...which would be the cheapest in their line-up. Hoya also makes single coated, double coated, multicoated, and supermulticoated filters.
Stay away from uncoated and single- or double-coated. Even those uncoated and single- or double-coated with the Hoya name!

CPLs are good. Don't cheap out. Get one of these: B+W 72mm F-Pro Kaesemann High Transmission Circular Polarizer MRC Filter. Or if you are using an ultra wide angle lens, one of these.

I would not bother getting a CPL for any lens with an ultrawide AOV...the fact that included sky spans such a widely diverse angle relative in position to the sun will result in very uneven effect of the polarizer seen in different parts of the sky! A 24mm focal length on FF sees 75 degrees horizontally...if you change direction that the polarizer points by 75 degrees, you will see a very visible difference in the darkening of the sky, a bothersome effect when captured in a single photo.

Wilt wrote in post #18550308
I would not bother getting a CPL for any lens with an ultrawide AOV...the fact that included sky spans such a widely diverse angle relative in position to the sun will result in very uneven effect of the polarizer seen in different parts of the sky! A 24mm focal length on FF sees 75 degrees horizontally...if you change direction that the polarizer points by 75 degrees, you will see a very visible difference in the darkening of the sky, a bothersome effect when captured in a single photo.

CPLs have other uses besides darkening skies, e.g. reducing reflections.

Pippan wrote in post #18550331
CPLs have other uses besides darkening skies, e.g. reducing reflections.

Very valid point. OTOH, how many times does someone shoot a product photo (needing to get rid of reflections) with a UWA?!
And while it can reduce reflections off water, then one has the requisite sky above the water, showing darkening effects in portions of the photo.
that brings us back to my earlier statement, "I would not bother getting a CPL for any lens with an ultrawide AOV"

Pippan wrote in post #18550331
CPLs have other uses besides darkening skies, e.g. reducing reflections.

For me, cutting reflections is the main use for a PL. It decreases certain daylight reflections and results in more saturated colours where the reflections are coming from - often really improving vegetation in landscapes. I don’t use it on (U)WA specifically because of the non-uniform sky effect. PJmak: If getting rid of those reflections would improve the kind of video you shoot, then get a good one

Me too. I use one most of the time--those high transmission B+W ones I recommended. Only cost slightly over a stop of light.

YES. Good luck finding someone to suggest a cheap filter.