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Tiffen 405F18 40.5mm Fog 1/8 Filter — main product image
Tiffen

Tiffen 405F18 40.5mm Fog 1/8 Filter

A light-density 40.5mm fog filter that adds a subtle dreamy glow without overwhelming image detail.

$47.50*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Tiffen 40.5mm Fog 1/8 filter is designed to introduce a controlled fog-like effect to photographs and video by subtly reducing contrast and creating a soft glow around highlights and light sources. The 1/8 designation indicates the lightest density in Tiffen's fog filter lineup, making it a conservative choice that adds atmosphere without dramatically altering the scene. This makes it particularly well-suited for portraiture, where it can soften skin and create a flattering light bloom, and for landscape or street photography, where it lends a romantic or nostalgic quality to the image.

The filter screws onto any lens with a 40.5mm front thread and is constructed with Tiffen's standard optical glass. Because the fog effect is created optically at the time of capture, it interacts naturally with the lens's rendering of highlights, flares, and depth of field in a way that software-based fog effects often struggle to replicate. Photographers should note that the effect is permanent in the captured image, so it is best used intentionally when the mood of the scene calls for it rather than as a leave-on filter. The 40.5mm size is commonly found on compact mirrorless lenses and some vintage manual-focus lenses.

Key Features

Creates a Fog-Like Effect to Image

Maintains Sharpness and Minimizes Flare

Dramatically Lowers Contrast

ColorCore Technology

Specifications

Brand
Tiffen
Model
405F18
Filter Type
Fog
Density
1/8 (Light Grade)
Filter Size
40.5mm
Effect
Soft Glow and Flare, Reduced Contrast and Sharpness
Application
Portraiture, Landscapes, Dreamlike Atmospheres

Pros & Cons

👍 Pros

  • The 1/8 density provides a very subtle fog effect that enhances mood without making the image look artificially processed
  • Creates a natural-looking glow around highlights and light sources that is difficult to replicate precisely in post-processing
  • Compact and lightweight 40.5mm size adds no noticeable bulk or weight to smaller lenses
  • Standard filter threading allows it to remain on the lens while using a lens cap or stacking with other filters

👎 Cons

  • The 40.5mm thread size limits compatibility to smaller lenses, which are less common on full-frame camera systems
  • The 1/8 density effect is very subtle and may be barely noticeable in evenly lit scenes without strong highlights
  • The fog effect is baked into the image and cannot be removed or adjusted in post-production
  • Single-density design means you need to purchase additional filters if you want stronger or weaker fog effects

Frequently Asked Questions

The 1/8 density is the lightest grade in Tiffen's fog filter range. It produces a very subtle softening effect and gentle glow, particularly around highlights, without heavily obscuring detail or contrast.
This filter fits lenses with a 40.5mm front filter thread. Check your lens cap or lens barrel for the thread size marking before purchasing.
Yes, it has standard threading that allows stacking with other 40.5mm filters such as UV or polarizers, though stacking multiple filters on wide-angle lenses may introduce vignetting at the frame edges.
Fog filters specifically reduce contrast and create a glow around light sources to simulate atmospheric haze, while diffusion filters primarily soften fine detail and skin texture. The fog effect is most visible in scenes with strong highlights or backlight.

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