I have looked at TS's photos and am intrigued enough to post the following question. Why were some elements out of focus? Was it too slow a shutter speed or too big an aperture setting? Taking pictures of crew moving about in cabin lighting- what would be optimal f no and aperture? would only the use of flash prevent blurring? Is there a combination of f no and shutter speed without flash that would result in sharp photos? Would flash guarantee non-blurriness on such an occasion? Hope you could kindly enlighten me. Thanks.