• This filter uses our standard B W F-Pro filter mount, which has a front accessory thread and is made of brass.
• Truly Neutral Gray design
• Manufactured from Water-White Schott Glass

The neutral gray half of this filter transmits 50% of the incoming light, so that it darkens the respective portion of the subject by one f-stop without altering its colors. For example, when the sky is too bright in relation to the landscape, this is an ideal amount for good detail rendition in the clouds and for preventing the sky from being "washed out" by over-exposure.