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Old Nov 26, 2004, 7:14 PM   #1
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About to purchase the Canon 20D and will get a 70-200F2.8L with a 1.4TC because it seams like a good combination forlimited size and weight (will hand hold), and distance. I know that there is a 1.6 crop factor but will this really be the same as 448mm when I print the pictures from full telephoto? (200 x 1.4 x 1.6=448. This is for sports photos and I wanted to get to about 400mm but without a tremendous amount of bulk. I have read that the 2xTC is not as good a combo with this lens.Bottom line, will this produce the same size pictures as if I was using a film camera with a 400mm lens?
many thanks!
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Old Nov 27, 2004, 11:10 AM   #2
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sportsfan wrote:
Quote:
About to purchase the Canon 20D and will get a 70-200F2.8L with a 1.4TC because it seams like a good combination forlimited size and weight (will hand hold), and distance. I know that there is a 1.6 crop factor but will this really be the same as 448mm when I print the pictures from full telephoto? (200 x 1.4 x 1.6=448. This is for sports photos and I wanted to get to about 400mm but without a tremendous amount of bulk. I have read that the 2xTC is not as good a combo with this lens.Bottom line, will this produce the same size pictures as if I was using a film camera with a 400mm lens?
many thanks!
8)8)8)8)
Well... I see that nobody has answered this one. So, I'll take a stab at it.

The EOS-20D has an 8 Megapixel Sensor. It happens to be physically smaller than 35mm film. So, it'snot using the entireimage projected by the lens. That's why you have a crop factor.

You're not cropping the sensor, you're cropping the image being projected.

So, from an angle of view perspective, you'll have just as much of your subject filling the frame with the EOS-20D, as you would by using longer focal length lenses on a 35mm film model.

But, the mediums are different (digitally stored 8 Megapixel Image, versus 35mm film). When you ask about the "same size pictures", this is not the same as the angle of view you'll have after a crop factor.

The size of your photos will depend on what size you view or print them at. What size prints are you looking for, and what will they be used for?

Chances are, you'll be very happy with the prints from the EOS-20D versus 35mm film at most commonly usedsizes (and there are downsides to enlarging either medium type too much).
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Old Nov 28, 2004, 4:59 PM   #3
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Here's another explanation:

http://www.stevesforums.com/forums/v...197800#p197800
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