Looking back a couple of months when I first purchased my Sony RX100 I said that I needed some form of adapter in order to use ND Graduate filters with this camera. As most of my work is shot in the landscape, ND graduate filters are an essential accessory for me and I just can’t work without them.
If I compare my LX5 I have an adapter tube that I can screw onto a threaded ring at the base of the lens. The RX100 however has nothing like this which is why after some searching I found the Lensmate solution. I have to admit that this is not a cheap solution and having incurred £12.50 in duty charges when it was shipment into the UK, it borders on being extortionate.
Well the adapter has arrived and it looks like just a couple of small pieces of metal and plastic. Basically there is a ring that sticks to the front of the lens using 3M double sided adhesive tape. Once in place there is a second threaded adapter that mounts onto the ring and clicks into place. This allows you to easily remove any filters with a small 90 degree twist of the adapter.
Now I have to admit that I was a little worried sticking a ring to the front of my new camera. I thought that it looks fiddly and troublesome to mount correctly. The kit does however come with a simple tool that aligns the ring e3xactly. There is a supporting video on the website and having watched this it took me less than 1 minute to attach the adapter and it was perfect first time.
So despite my complaints over price this is a very good design that works very well indeed. I have used the adapter out in the field and it’s perfect. It’s also very light and small enough so that the camera still fits inside the Sony case. If you need a filter adapter for an RX100 then this is worth looking at but beware the price is high.

Robin,
Which size of Lensmate did you buy? Did you buy ND filters from them also?
I bought the 52mm because most of my lenses for my GX1 are that size so I have plenty of adapter rings. As I do mainly Landscape photography I already have a few sets of ND grads. I use HiTech at this size. They are good value for money and most importantly neutral.