kaivalagi, what is your lens's native aperture (widest)? are you using extension tubes? how close are you when taking the shots?
I am using a tripod most of the time, and have found using live view and manual focus isn't a bad combination...it helps me when there is not much depth of field acheivable to get what I want in focus nicely...but is a slower process and fish don't stand still
The lens I am using is a 100mm macro, it's mounted onto a 450D body (more than adequate), so not true 100mm but a bit higher than that because the sensor isn't full frame. No extension tubes at all.
I am taking pics fairly close to the glass, but I am not focusing to the end of the lenses capability, so I know I haven't reached the limits of the lens. It can handle focussing as close as 30cm I think. The lenses widest aperture is f/2.8, quite good...the manufacturers page for it is here:
http/www.tokinalen...afl-m100-b.html. I guess for the DOF and ISO settings I would ideally want I need more light so I can close the aperture a bit, say f/5.6, and up the ISO speed to 400...shutter speeds for that will be stupidly large, I guess 1/2 second or similar
That's why I think I just need more light from inside the tank...using external light will cause all sorts of hassle with reflections I am guessing.
What sort of parameters are you dealing with, you say 1/15th slowest shutter, ISO of 400-800, but what about f-stop?
As you can see in this pic, a small change in depth and I've lost focus at the tail end of this Geo, I need a narrower aperture I think but light is a problem for that:
@fatheadminnow, sorry for changing the topics intention, I assume that you'll find this useful too though? Or will do
As you can see the lens counts for far more than the camera body...what light levels a lens needs has a big bearing on what is achievable