once again, i am having troubles lol. playing around some more with the sigma 70-300 lens (aka "the cheapy" as my wife calls it). i am finding myself getting what i want but most of the pictures have this bluing glow type thing to them. here are some pics i just took now to show. mind you they were hand held at night under medium fluorescent lighting, but the glow happens a fair bit in different situations, even with tripod/remote stillness. example 1 cactus spines iso 200 f/5.6 263mm 1/20sec used flash. example 2 cactus seeds. iso 200 f/5.6 263mm 1/20sec used flash....thinking this has to do with the problem...? cropped another question. i used a white lit box (used for growing seedling plants) and took a pic of various cactus....i used tripod/remot and mirror lockup and took dozens of pics and still not super fine detail.....i am at a loss now i see some excellent pictures of say a bumble bee, and the hairs are in nice detail on said bee....but i cannot (with this one lens) seem to get that kind of detail. example iso 100 f/6.3 1/25sec any thoughts as to what im doing wrong?