hey there.... I have just recently purchased my first dslr, a pentax k100d and am having some troubles getting the sharpness I expected. I am using a sigma 70-300mm dg apo zoom lens in macro mode on a tripod with a remote shutter release and a 2 second delay (flicking up the mirror before the picture is taken) but am still getting streaking. Shot with PENTAX K100D at 2007-07-16 The shots were taken repeatedly in an inside environment without any wind of any kind using a flash and each time an almost identical blur/streak in the same direction was captured. The other settings are (1/180, f5.6, 0.0 ev, iso 200). Does anybody know how i could possibly be going wrong here? any help is of course much appreciated... camm.