I found it quite annoying when I made with my DSLR photos with screwed filters and then wanted to change the location, since I had no lens cap that fit on the lens with the screwed filter. This has brought me to the idea of constructing a lens cap that also fits with screwed-on filters. Of course, the lens cap fits only if the filter does not have a larger diameter than the lens. The lens cap is constructed for a Sigma 17-70mm F2.8-4.5 DC Macro.