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1.5x magnification? or crop???

rickmark

Otis, US
174 posts

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rickmark Registered since 05th Mar 2006
Mon 13-Mar-06 03:59 PM

Hi -

OK - Best Buy just shipped my D200, might get here tomorrow. Can't wait.

However - I'm still trying to sort out this business of lens equivalency and multiplying focal length on a lens by 1.5.

It's never sounded quite right to me that the digital camera could actually increase the magnification of a lens. Why would that be?

Now I see on another message thread the explanation that makes more sense. Since the digital image sensor is smaller than my old familiar 35mm film frame, all that's happening when I take a digital picture is that I get an image that's cropped down (compared to film).

So the full-frame image from the digital camera would be exactly like a zoomed-in image (cropped) from my old film camera. Is this right?

To cut to the quick - if I take a picture of a little birdie that's 50 feet away and it takes up a small portion of my 35mm film frame and then I crop that image and blow it up, it sounds like I'll get essentially the same result if I take the same picture with the same lens at the same distance with my digital. But I won't have to crop quite so much.

Does that sound right? Or am I confusing you too?

Another way to look at it. If I take a wide-angle shot with, say, a 28mm lens on digital, I'll get a field of view that's the same width as a 42mm lens on a film camera. But the objects in the image will not be any larger in the digital, will they?

Thanks,
Rick



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