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Daan B Offline Image Upload: Off p.1 #1 · 40D/50D vs D300: outer AF points The Canon 40D/50D have crosstype outer AF sensors. The Nikon D300 has 15 cross type AF sensors grouped in the middle of the frame. The sides of the D300's frame (or bottom and top of the frame in portrait mode) have single axis AF sensors. So, I am curious: which camera will give more accurate/reliable AF WHEN using the outer AF points in portrait mode to focus on an eye at relative close distances using a medium tele lens? I am talking about selecting one single outer AF point and using One Shot/Single Shot. In theory the 40D/50D should do better in this particular situation... If you have used both the 40D/50D and D300 can you tell me if this is true in practice as well? Thanks FYI I have also posted this thread in the Nikon forum. Jan 08, 2009 at 12:16 PM

prof_fate Offline Image Upload: Off p.1 #2 · 40D/50D vs D300: outer AF points Hard to say unless you are experienced at using both bodies under similar circumstances, and not many people will be so experienced. I did shoot 20/30D and moved to mulitple 40Ds and shoot weddings - low light conditions where the difference matters most. There is NO comparison - the 20/30D only had the cross at teh center point and in low light the outer points were about useless, and even in good light they'd not focus on a say a person's cheek where there is little contrast. The 40's outer sensors work every bit as well as the center ones on teh 20/30 bodies. I'm constantly amazed at what I can focus on how that I spent years being frustrated by. BTW, I use the joystick to select my focal points and don't do the focus-recompose game. Jan 08, 2009 at 02:44 PM

Daan B Offline Image Upload: Off p.1 #3 · 40D/50D vs D300: outer AF points prof_fate wrote: Hard to say unless you are experienced at using both bodies under similar circumstances, and not many people will be so experienced. I did shoot 20/30D and moved to mulitple 40Ds and shoot weddings - low light conditions where the difference matters most. There is NO comparison - the 20/30D only had the cross at teh center point and in low light the outer points were about useless, and even in good light they'd not focus on a say a person's cheek where there is little contrast. The 40's outer sensors work every bit as well as the center ones on teh 20/30 bodies. I'm constantly amazed at what I can focus on how that I spent years being frustrated by. BTW, I use the joystick to select my focal points and don't do the focus-recompose game. Yeah, it will be hard... Although there are some switchers around About the 40D outer AF points... Do you use them in both One Shot and AI Servo? If so, any difference? Also, do you use the 40D in low light with the aid of a flash/AF assist lamp? I think that might improve accuracy. I have heard some Nikon users saying that the outer AF points of the D300 AF system are not particularly reliable/accurate, especially not in low light. I am just wondering how much it differs from the 40D/50D's AF system... Jan 08, 2009 at 02:57 PM

Yakim Peled Offline Image Upload: On p.1 #4 · 40D/50D vs D300: outer AF points I once had the opportunity to try a friend's D300 with Nikon 17-55/2.8 AFS and 105/2.8 VR AFS. I used AI servo and tried locking on people walking slowly in a dimly lighted room. Due to the limited time I had I only tried the linear AF points (leftmost and rightmost). I later repeated that with my 40D, 17-55/2.8 IS USM and 100/2.8 USM. Later I went out and tried the macro lenses on a twig moving in the wind. The results of the Nikon setup were - in a word - embarrassing. It simply struggled to lock focus and constantly had a serious lag. The 40D setup had no problems whatsoever. I simply can't understand why Nikon did not made all AF points cross type. Happy shooting, Yakim. Jan 08, 2009 at 03:24 PM

dhphoto Online Image Upload: Off p.1 #5 · 40D/50D vs D300: outer AF points I recently shot a series of a flying pelican with my new 40D and a 70-300IS using AI servo with all AF points enabled. The pelican moved right accross the screen and was in focus every time, using every AF point (except one frame where the bird wasn't over any points). I was very impressed David Jan 08, 2009 at 04:54 PM

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