Sigma 105mm EX Macro ....

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What F number does it work best at provided all the conditions and lighting are right? My 70-300mm Sigma works best at f7.1 for example.

:$ I hope that makes sense.
 
Jo,

If you're using it close up at high magnification then you should be looking at f/16 or thereabouts....the smaller aperture will give you a greater depth of focus.

Bob
 
It depends on what effect you are after ..... all in focus or just a part of the image?

Also would have thought that the lens to subject distance would come into play as well.

That's as how i understand it but i'm still at the stage of "not got a macro lens - Yet" so am probably wrong. :lol:
 
i find with my canon 100mm macro anything below f11 will give you too short a DOF , close up, even a small insect will be half in and half out of focus. so idlemonkey is right, took me ages to work that out, glad i dont use film
 
Thanks guys. I'm gonna have a play around with using different f numbers today and see what works best.
 
Hi, I have this lens, as well as sigma's 50mm macro. Use the smallest aperture you can with a workable shutter speed - not always easy when handheld. f9 for instance, shooting a grasshopper head on, will give you his head in focus but the DOF will extend only aout half way along his body. Sometimes this is good, I shot a fly at f6.3 where the DOF only covers the eyes, mouthparts and front legs, but it is a good effect. You'll find manual focus is the only possibility for real macro and at 1:1 ratio, i.e. extreme close up, focus is obtained by slight body movement back and forth (when handheld) - you can take loads and 1 out of 10 might be focused where you want! For most smaller aperture shots under natural light a tripod becomes a must. Good luck, look forward to seeing some shots!
 
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