PolarPro Iris Filter Expansion (3-Pack)

The Iris Expansion filter set includes an ND64 (6-stop), ND128 (7-stop), and ND256 (8-stop). We designed this expansion set for Iris users who film in bright, outdoor lighting. Typically, these filter densities will be needed to get the shutter speedSHUTTER SPEEDAperture, shutter speed and ISO form what is known as the exposure triangle in photography. Shutter speed is the length of time that a single frame is exposed for, more specifically how fast the shutter opens and closes to permit light entering the lens, to reach the sensor. A slow shutter speed means a longer exposure time useful for motion blur like the silky look of flowing water, whereas a fast shutter speed means a shorter exposure time useful for freezing the appearance of motion in images like a hummingbird in flight. It is measured in seconds starting at 1 second and halving our doubling in time. For example: 1/2s, 1/4s and 1/8s are all fractions of a second with 1/2s being the longest exposure time, 1/4s half of that and 1/8s another half etc. to 1/50th with an ISO ISO Exposure is controlled by three elements: Aperture, Shutter Speed and ISO. The ISO speed determines how sensitive a camera's sensor is to incoming light. A higher ISO speed absorbs more light, resulting in a brighter exposure, however, a higher ISO also results in more digital noise in low-light conditions. Cameras with larger sensors (like full-frame cameras) typically have higher ISO speed capability and produce less digital noise at high ISO settings. Digital cameras include a control for adjusting ISO speed, some of which can be set to adjust automatically in combination with certain other exposure settings. ISO is indicated in numbers usually starting at 100 and going upward (200, 400, 800, 1600 etc.) doubling in sensitivity each time. Most cameras also indicate 3rd stop intervals (100, 125, 180, 200 etc.)of 100 on iPhone cameras. Each filter has 8 layers of coatings on each side to reduce ghosting and severe flaring, all on top of our production-grade Cinema Series glass.

Top features

• Includes ND64, ND128 and ND256 filters only (Iris Filter System sold separately)
• Cinema Series glass provides outstanding colour neutrality and sharpness
• Ideal for filming in very bright/outdoor lighting conditions
• Machined aluminium grip for easily changing filters without getting fingerprints on the glass

ND64-6 stops

ISO: Low

Use: Shooting a very bright scene under harsh lighting

ND128-7 stops

ISO: User preference

Use: For long exposureEXPOSUREExposure is controlled by three elements: Aperture, Shutter Speed and ISO. Achieving the correct exposure is similar to collecting rain in a bucket, up to an optimum level. The rate of rainfall is out of your control (light), yet you can control these three factors: the bucket’s width (lens aperture), the duration you leave it in the rain (shutter speed), and how effective your bucket is in collecting rain (ISO). These three elements work together to control the amount of light per unit area, preventing underexposure (too dark) or overexposure (too bright), giving you a natural looking image. photography, blur motion natively-in-camera

ND256- 8 stops

ISO: User preference

Use: For long exposure photography, blur motion natively-in-camera