oredith wrote in post #6227720
it's a sub 100% crop of a bigger pic, so some of it was compressed. It's really not a show of a "good picture" as much as an example to help frame my question.
this was taken with natural/ambient light.
should i have gone with the flash, stopped down to gain more dof? what's a good ISO to shoot macro at?
MF (especially since the AF on the tamron 90 is really horrendously slow and hunts a lot.. ) The shot was taken with other people's suggestion of holding the focal length, and shifting my body in until the focus beep comes on. makes it pretty difficult to hold still for the shot though.
If you crop, you're going to lose some quality. The best eye detail shots, IMHO, are taken when you are as close as you can possibly be to the subject of course - maximum quality. Go out early in the morning when the insects are least active and you can get really close and practise more shots.
Flash - yes. I always use flash. I know there are some great natural light shots, but fill flash is just more forgiving. Set your camera manually as you did - f/9-f/11 for 1:1 shooting, shutter speeds around 1/200-1/250, and adjust ISO from 100-400 say to get more or less ambient background in. Let the flash take up the difference.
Stop down more for better DoF? Sure - but not too much. Keep below f/13-f/16 if you can. f/16 and over you'll start seeing diffraction softening.
My rule of thumb, derived from Brian's posts and personal testing, is for 1:1 f/11, 2:1 f/9. I'm still playing with higher mags on the MP-E 65. Keep in mind that with your macro lens, if you're not shooting at it's minimum focus distance, you're not shooting 1:1 and since you're a touch further away you can probably get away with slightly wider apertures for similar DoF.
MF technique you mentioned is the way to go IMO. Focus on the eyes, move forward until the eyes go just out of focus, then come back until they are in focus again. This ensures the in focus DoF is maximised on the eyes or whatever you're focusing on.
It's just practise. Sounds like you're doing all the right things. 