this lens cap works well
see in the pic there is a seperate ring? that is supposed to screw into the filter thread and the cap is a snug pop on or off fit its snug enough that by not bothering with their supplied ring the cap will fit tightly over the outside diameter of the filter.
they actually also work quite well for custom white balance too even in mixed lighting and are much more convenient than a grey card
If it fits snugly without falling off on a 82mm slim filter, I'd rather get this than a expensive XS-Pro ... but I didn't quite understand the concept of this cap ... do you use this? how does it work?
yeah its easty to use
with the cap on the lens flick it over to mf
point camera at scene you are going to shoot with AWB enabled
take a pic
set that pic as custom white balance pic
flick AF switch back to AF (annoying when you forget this part)
carry on shooting
Sorry, I think I didn't ask the question correctly ... I am not talking about the WB ... what I wanted to know was how does the cap fit, because you said:
"see in the pic there is a seperate ring? that is supposed to screw into the filter thread and the cap is a snug pop on or off fit its snug enough that by not bothering with their supplied ring the cap will fit tightly over the outside diameter of the filter"
I am a bit confused, do I need to attach the separate ring in order to fit the cap snugly on to my 82mm slim filter?
I am not interested int the custom WB part as I already have a Rogue ExpoDisc and a WhiBal ... I am only interested in the cap for my 82mm slim filter.
oh it fits because you just forget about the mounting ring it comes with and it snuggly fits over the filter itself
ie the inside diameter of the cap = the outside diameter of the filter
5D MK III, 16-35/2.8 L II, 24-70/2.8 VC, 24-105/4 L IS, 70-200/2.8 L IS II, 100/2.8 L IS, 40/2.8, 50/1.4, 85/1.8, 150-500 OS, 600EX-RTx2, ST-E3-RT, Rokinon 24/3.5 T-S, D7100+18-300 VR, YN568EX, 055CXPRO4+468MGRC2, 190CXPRO4+322RC2, Gorillapod Focus+496RC2, CamRanger, B+W filters, Konova K3/31.5 etc