This K&F variable ND filter (ND2-400) is a nice budget choice filter that works good and won't break the bank. There are no hard stops on the adjustment ring and will spin either way endlessly. Other than that the filter is made well and comes in a nice case. Take note (as description states) that you will need a larger lens cap to put on the end of this filter if you plan to keep it on and want to add a lens cap. For instance I have the 72mm version of the filter and it requires need a 77mm lens cap. Yes they mention it but I think they should include the corresponding lens cap with the product based on the filter size purchased. You should also know that ND filters do not work like magic you have to understand all of your camera settings and the environment you are shooting in otherwise you may get poor results and blame it on the filter when it is actually just your settings that are wrong. It takes practice to get the proper settings for long exposure photography and every camera and lens combo will have different settings and results. I have always been happy with any K&F filter (and other products) I have purchased and this one is no different.