This is a quick tutorial to add filters (UV, close-up, ND, etc.) on your Lumia 1020 or Nokia 808. I've started this with the 808, inspired by Al Reynolds (@ibat400 on Twitter) experiments.
The idea is to take a hard case (for the 808) or the grip (for the 1020) and to glue an adapter ring on it ; filters will be screwed on that adapter.
For the 808, I used a 49-->52mm step-up adapter (my filters are 52mm).
The adapter ring is glued on the case with sugru (sugru.com). Just clean your hands before touching the device, to avoid to leave dirty fingerprints
For the 1020, it's a bit different. The lens is not centered in the camera island. For macro lenses, to avoid a fall-off, one should recenter the filter on the camera lens, not the camera island. Richard Dorman (@sheridan01) has come to the same conclusion before me.
To achieve that, I've chosen the biggest diameter for the adapter ring. According to me, it's 62mm. So I have a step-down adapter for the 1020 : 62-->52mm.
Glued like this, always with sugru:
As you can see, there is an offset. 2 advantages: you can use the flash if no filter is mounted. And with macro lenses, they are as centered as possible.
One warning for the camera grip: adding that ring will stiffen the grip and removing the camera grip will become much harder. I've finally found a technique to remove it, but if I have the opportunity, I'll get another grip to have one for filters, another for P&S (with easy removal).
The filters I own are: UV, polarizer, close-up, ND. They all work great with the 808 and the 1020