Lady Beatle

[OldClicker]

I've been trying different macros in my little light box set up and cannot seem to get any sharper than this. This is about a 100% crop. Are there techniques I am missing or am I lens limited at this point? Any critique welcome.

Sony A350
Minolta 35-70mm f/4
Min focus= 12" (macro switch - manual focus only)
Tripod (cheap) using the timed shutter release to minimize shake
ISO 100, f/5.6 & 1/10 sec.

TF

EDIT: Sorry about the spelling of beetle. Generational problem, I think. :-)