Kathy After reading one of Ansel Adams' books, "The Camera", it's pretty easy to understand. A lens of a given focal length projects the same size image on the film regardless of format or film size. In other words, if a 300mm lens projects an image 1 inch high on your film, it will be 1 inch high regardless of film size. This means that on an APS sensor, the image would be larger than the frame, but on 4x5 sheet film it would only take up 1/4 of the height of the film. So, with an APS size sensor, the "magnification" would be the same as 35mm, but your subject would take up 1.5 times more space on the film, making it the "equivalent" of 450mm in 35mm format.
Bill -----Original Message----- From: Kathleen [mailto:[EMAIL PROTECTED] Sent: Saturday, August 30, 2003 1:35 PM To: [EMAIL PROTECTED] Subject: Re: Future DSLR's Joe - Thank you for your easy-to-understand explanation. I have been so confused about this and have tried to understand it. In finally makes sense. It's about equal to what a digital zoom does on some of the cameras. It essentially is zooming in on the center of the image and is making that part of the image and enlarging it so it will fill the whole frame (thus a not-so sharp image). The only thing making me want a removable lens DSLR is that I felt I could get a 450 lens ( or thereabouts) out of my rather inexpensive Tamron 70-300 zoom. That sounded good, but to me sharpness and clarity is more important. Let me know if I am misinterpreting what you said. Thanks again. Kathy Leickly
