thoughts on upgrade to 40D from Rebel XT

[Cozen]

I agree. I checked the comparisons before. My lens at f8 and 135mm seems quite sharp tho.

[Garrett-Grimsley]

Those are some nice shots. What kind of lens are you using?
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Those were taken with the Canon 85mm f/1.8 USM and the Sigma 15-30mm f/3.5-4.5 lenses.

[District_History_Fan]

My son has an XT and I have a 40D. One thing no one has mentioned is High ISO noise. You'll be at least a stop better on noise control with the 40D.





The 40D is a much better made, more responsive camera than the XT. Everything from its LCD to the improved menu system will be an upgrade. You are in for a treat if you get a 40D.

[DavidEccleston]

At 70mm f/8, the square has lots of chromatic aberation. The horizontal lines leading into it are a bit blurred, and the vertical lines are fairly blurred. The numbers are blurry too. The diagonal stripes are blurred. The 70-200 F4 IS blows it away, even at F4.


At 135mm f/8, the top circle and numbers, and the middle section are sharper, but still not as sharp as the 70-200. The bottom part of the image still has all the blurriness issues 70mm has, and going up to f/11 or f/16 doesn't completely clear it up.


So, yeah, for 100% crops, which is good for birds, etc. that you can't get too close to, certain lens will produce much cleaner images. I'm sure the 28-135 lens is great for general use, but if you're interested in 100% crops, it's not the best of lenses.