Is there a local store at which you can try one out? I ask because in my quest for lens cases, the Lowepro Lens case 1W specifications state a 100mm internal diameter, but my EW83J lens hood, which measures ~107mm in diameter, slides down into the case reasonably well (tight, but I didn't have to force it). I just brought the hood into the camera store (which charges double what Amazon does for the case). When the case (which I bought from Amazon) arrives on Wednesday, I'll try the whole lens. My point is that the measurements are 'approximate' and the flash may, in fact, fit.