I've bought filter holders made up of rings for every common lens diameter, making them an excellent choice for handling square filters and with all lenses. The filter holder It's pretty easy to use, if you already wear the ring on the lens it's no problem to place it or filters in adverse circumstances, e.g. B. on the beach or on the mountain, where it can be difficult to deal with the equipment in the backpack. The quality price is ok. All the reviews say it's excellent... The truth. Shoot with no controls while moving around with the equipment already attached to the camera, either because you want a different frame (which is already on a tripod) or because you want to carry everything assembled from the start ( not recommended). -Do not use with side wind. The rubbers that hold the crystals with some manipulation of the camera or when the previous filter is removed (allows 2) if you lose it moves and light enters. Take care of this aspect so you don't get a flare when you arrive at the computer. Filter holder itself 2 stars Filters itself, great for the price. No dominant appreciation of color, they are resistant, good materials, excellent. 2 can be used at the same time without any problems. Presentation, very good. There are already many reviews of it. I hope it's useful.