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Roman's notes

Filters

This page covers screw-in filters for stills and video: neutral density (ND), circular polarisers (CPL), combined designs, and a few creative / look filters. Use it for buying checks and short product notes.

Choosing screw-in filters

Section titled “Choosing screw-in filters”
Topic What to check
Thread size Match the lens Φ marking (e.g. 67 mm, 77 mm). Wrong size needs step rings or the wrong filter.
Stack height Thick rings or stacking filters can vignette on wide angles. Thin profiles help.
Variable ND On wide lenses, “X-pattern” uneven darkening can appear at strong ND settings; many filters limit the rotation range to avoid it.
CPL + ND combo A 2-in-1 saves one stack position; you still rotate one ring for polarisation after setting density.

Neewer 2-in-1: variable ND + CPL

Section titled “Neewer 2-in-1: variable ND + CPL”

Neewer 2-in-1 variable ND (ND2–ND32) and CPL: knurled metal ring, green multi-coated glass, retail box with ND range diagram

Overview

Section titled “Overview”

NEEWER 2 in 1 Variable ND Filter ND2–ND32 & CPL Filter — one ring that combines variable ND roughly ND2–ND32 (about 1–5 stops) with a circular polariser. After setting the ND, rotate to dial in polarisation (water and glass reflections, sky saturation).

Specifications

Section titled “Specifications”
Type Variable ND + CPL
Density range ND2–ND32 (~1–5 stops)
Threads 37, 43, 46, 49, 52, 55, 67, 72, 77 mm
Glass HD optical glass; nano coatings (water/oil/dust resistance, lower reflectance)
Frame CNC aluminium; slim profile (~7.6 mm frame depth excluding thread height)

Field notes

Section titled “Field notes”

Neewer documents a limited rotation range on variable NDs to reduce cross-pattern artefacts and heavy vignetting on wide glass — still test on your widest lens. Confirm thread size from the lens Φ stamp before ordering.

In the box

Section titled “In the box”

Filter, pouch, cleaning cloth.

PolarPro Portra Filter

Section titled “PolarPro Portra Filter”

PolarPro Portra Filter — creative screw-in (and Helix system) filter that targets a Portra 400–inspired colour response in camera, not in post. Optically it mixes warm/natural tone, subtle white mist diffusion (PolarPro describes it as 1/4 strength), and a rotating chroma polariser for glare control and richer separation.

Sample collage for PolarPro Portra Filter: warm portrait look and contrast with untreated digital
Intent Film-inspired warmth, creamy skin, softer highlight roll-off
Polarisation Adjustable “chroma” polariser (rotate for reflections)
Threads (screw-in) 49, 67, 77, 82, 86 (c), 95 (c) mm — confirm Φ on each lens
Also Helix drop-in variant for quick swaps in the field
Section titled “Related”

Sources

Section titled “Sources”