“is this one good for Sony A7iii with FE 50MM f1.8 lens? thank you”
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From my research you would need a 49MM lens filter thread size for use with this lens. When you see the MM figure in the description, in this case 50MM, they are referring to the focal length of the lens. That "loosely" gives you an idea of the "magnification" of the lens. That number should not be confused with the "lens filter thread size". Yes it is confusing! In this example the "FE 50MM f1.8 lens" is a 50MM lens but it uses a 49MM threaded filter! For confirmation of what filter thread size is required for you (or anyone looking for a filter for their specific lens). You should search for the required "lens filter thread size" in the specifications for your camera model or its lens. Fixed lens cameras would only require one size filter. Some cameras cannot accommodate a filter because their lens may retract into the camera when you turn it off. If you purchase a camera with removable lenses, you will probably require a different lens filter thread size for each of your lenses. Different focal length lenses usually require different lens filter thread sizes because when the focal length of the lens increases the lens diameter usually increase too. If you want to save some expense when getting specialty filters at the risk of less convenience you have an alternative. If you use specialty filters that can be very expensive and you have more than one lens, I suggest you purchase the expensive filter that fits the thread size of your largest lens. You can then purchase a very inexpensive threaded adapter that will allow you to use the larger filter on your smaller lens. For example if you need a filter to fit your larger 55MM threaded lens you would buy a 55MM filter. Then if you also have a lens that uses a 50MM thread size filter you would purchase an inexpensive 55MM to 50MM reducing adapter that allows you to use the larger filter on the smaller lens. I highly recommend that you add an appropriate filter to all of your lenses immediately to any camera lens that will accommodate one! The biggest reason is because the unfiltered lens is exposed to everything! Any salt spray from the ocean or environmental dust will certainly find its way onto the optics of your new lens! There is no way that you can clean it from the lens without causing damage that will only get worse every time you try to clean your lens! It also offers greater protection from bumps and scratches. Most cameras and lenses can be quite costly and in my life I have never had to repair or discard an expensive lens due to physical damage. However I have had to replace some filters that were damaged but at the same time they protected the lens itself. If you are giving a lens or camera as a gift or you are a first time camera buyer, do yourself a favor and use a filter!
Sorry, there was a problem. Please try again later.This filter will fit a variety of products just make sure the mm size is the same on your lens. If you dont know the mm size you can check manufacturer or simply look on the inside of the lens cap the size should be listed there. hope that helps
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