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Several months ago, Sony released a new user-changeable 2K optical low pass filter for their F5 and F55 cameras. The filters are incredibly easy to swap out by loosening just a single Philips screw in the upper right hand corner (yellow arrow in first picture above) of the filter. Simply slide the 4K filter to the right, and pull it away from the camera. The 2K filter then snaps right in, slides to the right, and is held in place with the same Philips screw.

Normally, a low pass filter is used to reduce the effects of moiré and aliasing. The F5 and F55, however, don’t suffer as much from these effects due to their much smaller pixel pitch. The main use for an optical low pass filter in this case is to soften the image, giving it a more “filmic” look – what Sony refers to as “softer, organic images.”

The cameras use the sensor in three different manners: you can use the entire sensor and every pixel for 4K recording, the entire sensor for oversampled 2K and HD recording, and center-cropped for 2K and HD. Below are some examples of all three sensor modes with the 4K filter and with the 2K filter for comparison.

Edit: The 2K OLPF’s main use is to improve the image quality of 2K High Frame Rate Recordings and 2K Full Frame Mode, but it also has the added benefit of providing a more filmic look to the 4K recorded images. This filter is not a required accessory, but it is helpful for certain highly detailed scenes.

4K Image Scan

2K Full Scan

2K Center Scan

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