I just accessed Amazon, by clicking-on the affiliate link at the main Cameralabs page, and ordered a Canon Macrolite 67 Adapter. I found that I can use my Macro Ringlite on my EF 35mm f/2 IS, with the adapter, without vignetting in the corners. As my two adapters stay on my macro lenses, I ordered another adapter, that can remain on my 35 IS, for convenience, and to protect the filter threads, functioning as a short hood. There is no hood packaged with 35 IS, anyway, and I do believe in using hoods for protection of the front of the lens.
Last week, I traded, two well-liked, but recently little-used lenses, toward a Nikkor 35mm f/1.4G lens, at a local camera store. This was the first time I had traded lenses that I had used to capture some memorable images, but, ultimately, they had been sitting, largely unused, in the recent past, and I had to trade or sell something to add another lens. While shooting in low light, with a Nikkor AF 35mm f/2D, the flare and ghosts had been bothersome, and there were times I found myself wanting to open the aperture a bit more. Plus, the 35/1.4G is weather-sealed, whereas the 35/2D is not sealed at all. The 35/1.4G remedies the second and third of those three issues, and might mitigate the flaring and ghosting. (The 35/1.4G, in spite of its "pro" build and high price, has no ED elements.) Ergonomics are most certainly improved, on the D3s, as a wide, shallow groove on the lens body is perfectly placed for my left thumb and fingers to grasp the lens firmly while shooting.
Canon 5Ds R/7D2/7D/5D/40D/1D2N; Nikon F6/D3s/D700/FM3A/Coolpix A. Lens selection undergoing changes; some favorites: Zeiss 2/135 APO Sonnar, Canon 100mm f/2.8L Macro IS and 135L, Nikkor 14-24/2.8G and 200/2 VR.