The A Series filter holder and filters fit all 35mm SLR camera lenses with 36 thru 62mm diameter filter threads and Hasselblad (R) mount. A Series Filters require the use of the A Series Filter Holder. Pastels. The pastel filters (086 and 078) can be used to add delicate pastel hues to your subject. All you need is a pleasant subject, a backlit scene or a simple tree landscape. You can also combine these filters with others for that certain look.