burb72 Junior Member 20 posts Joined Oct 2008 More info | Oct 28, 2008 19:47 | #1 I took about 60 shots with each on a tripod at night indoors using the same prime and the xt would gather more light using different f stop ranges, the xsi did focus better. Sometimes the xt would hunt a little more than the xsi. Just wondering if i got a bad copy or is it standard deal that the xt gathers more light?
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gjl711 Wait.. you can't unkill your own kill.  57,730 posts Likes: 4065 Joined Aug 2006 Location: Deep in the heart of Texas More info | Oct 28, 2008 19:58 | #2 You sure that the XT didn't meter hotter? I've had both and it seemed that the XT over exposed by about 2/3 stops and the XTi under exposed by about 1/3 stop but if you manually set the ISO, speed, aperture, it was pretty much the same. Not sure why, but call me JJ.
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bacchanal Cream of the Crop  5,284 posts Likes: 22 Joined Jan 2007 Location: Fort Wayne, IN More info | Oct 28, 2008 20:01 | #3 burb72 wrote in post #6580340  I took about 60 shots with each on a tripod at night indoors using the same prime and the xt would gather more light using different f stop ranges, the xsi did focus better. Sometimes the xt would hunt a little more than the xsi. Just wondering if i got a bad copy or is it standard deal that the xt gathers more light? thanks I'm not sure if this applies to the xt/xsi, but I believe at one point Canon was understating their ISO values by about 1/3 of a stop (ISO100 was really ISO125 equivilant and so on). This was around the 20D/30D timeframe. On the more recent cameras they corrected this so ISO100 in camera is now really closer to the ISO100 standard. This may be what you are seeing.
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basroil Cream of the Crop  8,015 posts Likes: 2 Joined Mar 2006 Location: STL/Clayton, MO| NJ More info | Oct 28, 2008 20:02 | #4 Yes, it's well documented that all canon cameras up to the 30d/5d were underrated by a third of a stop. when the camera is at iso 800, it actually is as bright as an iso 1000 camera should be. It's not that the XSi is darker, it's that the XT is brighter. The hunting is normal, XSi has the same AF system as the 20d, the XT only has that of the 10d. I don't hate macs or OSX, I hate people and statements that portray them as better than anything else. Macs are A solution, not THE solution. Get a good desktop i7 with Windows 7 and come tell me that sucks for photo or video editing.
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Oct 28, 2008 20:25 | #5 I used a 1.8 prime, had both set at iso100, both set to same shutter speed, changed f stops. Tested at 1.8 and also at 2?, 4? and started to change iso and speed. At every same setting, the xt produced a brighter image. Thanks for your help, question answered. If my xt could focus better might keep the xt.
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basroil Cream of the Crop 8,015 posts Likes: 2 Joined Mar 2006 Location: STL/Clayton, MO| NJ More info | Oct 28, 2008 21:02 | #6 Both are set at iso100. Answer solved. As I said before, the sensor is more sensitive than it should by a third of a stop. The metering system is the same, so changing the setting for both won't help. I don't hate macs or OSX, I hate people and statements that portray them as better than anything else. Macs are A solution, not THE solution. Get a good desktop i7 with Windows 7 and come tell me that sucks for photo or video editing.
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