<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]Hi schweepes,
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]welcome to the forum!
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]Originally Posted by schweepes
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]It appears that you are thinking in reverse, 1.8 is a wider aperture than you currently have and it can really try your patience. More on that in a minute, first a quick explanation of aperture settings. The lower the number the wider the lens opens to let in more light. The numbers also do not go in a straight progression. For example, f/2.8 is a wider aperture than f/4.0, but, in fact it (f/2.8) allow in twice as much light as the f/4.0 setting. One major advantage to the wider aperture (lower number, ie. 1.8) is that by allowing more light to hit the sensor you can take pictures in lower ambient lighting with out a flash, or as much flash.
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]Now to the patience trying part: although there are some tremendous creative uses for the wider apertures, the have a lot shallower depth of field. What this means in the simplest of terms -- for your immediate purposes -- is that even the most minor of out of focus (OOF) will result in a "soft" (less than sharp) picture. You may never be happy with f/1.8 on your T2i because the slightest mis-adjustment between the camera and lens will appear less than sharp focused. Canon knows about these tolerances and the solution they have is in the non-Rebel series cameras -- AF Microadjustment. What this feature does is allow you to dial the exact setting for a specific camera/lens combination. You may need to shot at f/4 or higher to obtain desirable results in your images. What scalesusa was suggesting was to try f/5.6 of f/8 as the smaller aperture, which they are. The down side is that you will need more light and/or higher ISO settings to get yopur images.
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]What the AL Servo does is adjust the focus using an algorithm to compensate for movement, very useful with a toddler. []<span style="font-family: comic sans ms,sans-serif;"]You should set to that setting if it is not currently your default.
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]Can't argue with that! []
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]Good Luck,
<span style="font-size: small;"]<span style="font-family: comic sans ms,sans-serif;"]Chris
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