On smartphones, the effects of many photographic filters can be fairly easily simulated by apps but if you are more of an old-school photographer who also likes to shoot with a phone, Sandmarc's new premium line of polarized ND filters for smartphone photography and video recording might just be what you have been waiting for.

The accessory maker's new models combine neutral density and polarizing functionality in one hybrid filter and are manufactured using multi-coated and anti-reflective glass for accurate color transmission. An aluminum frame should provide toughness.

The filters can be attached to Sandmarc's iPhone lenses or directly to the smartphone using the included clip. They are compatible with most recent high-end models from Apple, Samsung, Huawei and other manufacturers and come with an inner diameter of 40.6mm and an outer diameter of 55mm.

The set includes polarized ND16, ND32 and ND64 filters and be pre-ordered now for $129.99 on the Sandmarc website where you'll also find more information including a full list of compatible devices.