
Something's doesn't seem right here...not you or your shooting, but just the picture in my mind regarding how much/little light you had that you couldn't see through the VF well enough to focus, whether AF or MF....
it seems to me that @ ISO 1000 shooting at 100@ F4, if that was the correct exposure, you should have had plenty of light for AF
I'm posting a couple of shots here from a family gathering, all shot under ugly florescent tubes...... even at ISO 1000 1/40 and 1/45 sec @ F4.5 it seems plenty bright...even at a full stop darker it was bright enough for AF without flash assist....Please understand, I'm not posting them so much for the quality of the pix as for the quality of the light...


Kit a hint when under those tubes shoot at 1/15, 1/30, 1/60, 1/125. Something to do with the frequency the tubes fire at. I shoot in those kind of lighting conditions all the time and it makes a big dif.