Starting with a Kodak Series V push-on filter holder on my Hawkeye Brownie, I have added several step-up rings to get to 58 mm, which is the size of many of my screw-on filters. If the filters are too big, they block the viewfinder excessively. The filters have the same effect they would on other cameras, e.g., yellow has a modest effect and red has a dramatic effect. My Brownie Cresta II can also take a push-on filter holder though the Cresta has a built-in yellow filter. The Cresta, while similar to the Hawkeye, has the advantage of natively using 120 film.