Answer: There is a front thread that allows another filter to be mounted to it, as long as it has the same aperture 

Answer: There is a front thread that allows another filter to be mounted in front of the black soft filter, as long as the larger 1 has the same aperture. For example, if the filter is 67mm, then you need to install 72mm 

In order to buy a lens filter, you need to know the diameter of the lens. The size is usually displayed next to the ø symbol on the front of the lens. 

The adapter will mount the lens and you will be able to use it manually. However, my copy of the adapter does not allow the lens to be fully mounted all the way until it clicks into place. It doesn't quite make it, but it's still very solidly mounted. Also, the manual aperture linkage doesn't work properly (on my copy, at least) so exposure is controlled only by shutter speed and/or ISO. You will be able to manually focus and zoom the lens but no VR, of course. It will be a frustrating experience. Instead, get a 14-140 Panasonic zoom if you can afford it! 

There is a front thread to allow another filter to be mounted in front of the Black Soft filter, as long as the larger one is of the same aperture. For example, if the filter is 67mm, you would need to mount a 72mm filter.