Mon 07-Jan-13 01:17 AM | edited Mon 07-Jan-13 01:20 AM by mkbee1
Steve; What is the detail needed that is not shown in the posted photo? Is the iris not dilated enough? Are you trying to see deep into the eye, like the retina?
IIRC, there is or used to be, a lens...the Micro Medical Nikkor...that would probably do what you wish. But,it is likely very expen$ive.
In your stable of lenses, there are at least two that will help you achieve what you want.
While neither are Macro, your 18-105 and 70-210 can get you close at minimum focusing distance, maybe close enough.
If not, a good-quality and relatively inexpensive "Close up" diopter can get you close enough, with a bit more working distance. Buy it for your largest lens diameter, and invest in step-up rings for the others.
Amazingly sharp, but you have to keep them clean. Next, comfortable seats for your subject, patient, victim,...choose one...and yourself!
Tripod,and the MLL3 Ir release,or a copy.
Dimly-lighted room, not dark, to promote better eye dilation, and a well-diffused flash. Small aperture, at least f/11, to provide enough DOF. Focus carefully.
Orient the seats so windows, doors, etc. ,don't leave a reflection in the eye. Then experiment, so the flash doesn't do the same.
People get antsy: so...like in debate, Be Brief, Be Brilliant, BEGONE!