Unfortunately, Digicam manufacturers use 35mm format as a reference for their lenses. So, a 34-102 Canon G2 lens is in actual fact a 7-21mm lens. My Dimage 7 has a 28-200 Zoom, but in actual fact it's a 7-50mm lens.
Jeff ----- Original Message ----- From: "Mishka" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, May 20, 2002 8:55 PM Subject: Re: OT: Digital camera or scanner for macro photography? > > From: Rob Studdert > > Subject: Re: OT: Digital camera or scanner for macro photography? > > Date: Mon, 20 May 2002 15:30:29 -0700 > > -------- > > On 20 May 2002 at 10:56, Mishka wrote: > > > > > I think (pardon my ignorance), macro is the area where the brute > > > pixel count is all-important. More pixels == higher magnification, > > > that simple. > > > > The relationship is nothing of the sort. Magnification is related to > > lens focal length vs sensor dimensions. Your analogy equates to film > > grain deciding macro magnification. > > I have to admit, I have done very little macro myself. But, unless I am > missing something very basic, the magnification is related to the image > size vs. object size. It should have very little to do with the focal > length alone (ducking for cover). 100mm 6x7 lens allows to get to the > same magnification as 100mm 35mm lens -- not on the negative, of > course, but on the final print. > Having 2 images, one with the subject 10 pixels wide, and another 1000, > I'd say, the second one has higher magnification. Wouldn't you? > And, yes, I do think that the film grain and lens resolution determines > the magnification. You think it doesn't? > > > > Now could someone please explain me, what is that "added DOF of > > > digital cameras"? > > > DOF is depth-of-field IOW the depth of acceptable focus, digital > > cameras most often afford a greater DOF than their 35mm counterparts > > for the same magnification ration due to their smaller sensor size > > and their correspondingly shorter lens focal lengths. > > Again, I am at loss here. Why not shoot with 20mm lens at 35mm, crop > the venter of the frame, and have the same DOF? But it doesn't make > sense, does it? > LAUNCH - Your Yahoo! Music Experience > http://launch.yahoo.com > - > This message is from the Pentax-Discuss Mail List. To unsubscribe, > go to http://www.pdml.net and follow the directions. Don't forget to > visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
