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Old Mar 17, 2011, 10:19 PM   #11
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Both the .31m and the .48m settings can be used for general purpos photography, but to focus closely, for 1:1 macro, you need to use the .31m setting (.31m is about 12 inches, btw.) The .48m setting is for situations when you don't need to focus closely and just want to use the lens as a conventional medium telephoto lens. The .48m setting limits the range that the lens can focus, so it will focus more quickly.
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Old Mar 17, 2011, 10:33 PM   #12
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What do the ratio numbers mean? ...i.e. 1:1?

Last edited by Organizedkhaos; Mar 17, 2011 at 10:33 PM. Reason: spelling
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Old Mar 17, 2011, 10:34 PM   #13
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Thank you Tcav!!! That helps a lot. Thanks Shoturtle for always trying to answer my questions
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Old Mar 17, 2011, 10:34 PM   #14
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1:1 is a ratio that the subject is register to the sensor. At 1:1 if the subject is 20mm, it would take up 20mm of the sensor space. That is the quick and dirty of 1:1
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Old Mar 17, 2011, 10:36 PM   #15
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With .31m focus is slower the at .48m. As the lens have more focus travel if it goes from .31m to infinity. So it is quicker to shot general photography stuff at .48m instead.

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Thank you Tcav!!! That helps a lot. Thanks Shoturtle for always trying to answer my questions
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Old Mar 18, 2011, 12:04 AM   #16
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what do you mean, if the subject is 20mm?
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Old Mar 18, 2011, 12:17 AM   #17
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At 1:1 it is a direct capture of the subject. If something you are shoot is 20mm long, it will take up 20mm of the image space on the sensor. So if you are shooting something that is 10mm in diameter it will take up 10mm diameter on the sensor.
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Old Mar 18, 2011, 12:42 AM   #18
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I appreciate all the responses. I assure you... I'm not asking simple questions just to give up the moment it gets too hard.

I am persistent and am determined to make good on every shred of info you share with me.
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Old Mar 18, 2011, 12:48 AM   #19
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no problems,

with 1:1, since the senor is so small, and it register the exact size of the subject. When you convert it to 4x6, 5x7 or 8x10 you get a really up close and detail heavy image.
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Old Mar 18, 2011, 10:02 AM   #20
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flash choices are easy actually with canon. The 3 big options are canon, metz and nissin. All work the same, just a little different interface.

If you want serious power on a flash, canon 580exII, Metz 58 AF-2, and Nissin di866.
Good power Metz 50 AF-1, Canon 430exII, and Nissin di622.

I would not go smaller.
When I did my flash research, I decided to go with the Nissin di866. While the flash is excellent, I do have one complaint: it's incredibly noisy. As it adjusts to the focal length on my 24-70mm lens, it makes a terrible grinding/gear sound that is very distracting. I contacted Nissin about this thinking it was a defect and they told me that it is a standard characteristic of the flash. It wouldn't be an issue on a macro, but it something to take into consideration if stealth is important in your shoots.
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