The sun spoiled these shots to an extent, blowing out the yellow markings on it's back and shading the foreparts. Unfortunately, fill flash makes this animal shake itself violently back and forth, thereby making for a long wait between shots - so it was not used; too, the spider's body is very prone to specular reflection, QED.
Two shots to look at:
Shot I with Sigma SD1 Merrill and Sigma Contemporary 17-70mm at approx 50mm f/13. Not quite enough DOF for my taste but commendably sharp for a zoom here and there. Poor choice of background, legs almost invisible.
Shot II with Sigma SD1 Merrill and Sigma 50mm Macro @ f/16 for more DOF. Much better focus and DOF, IMHO. Interestingly, what looks like pixelation on the web strands is actually blobs of sticky stuff.
Both processed in Sigma Photo Pro 5.5.3 then exported 16bit TIFF to RawTherapee and given a serious working over on the acutance front, cropped, re-sampled 50% and saved as sRGB, JPEG Y'CbCr 4:4:4, 90% quality.
Comments welcome.