Sunday, April 1, 2007

May 2007 HelpLine

DPMag Published in HelpLine
May 2007 HelpLine

One thing to remember throughout these last steps is to pay attention to when you use "Save" and when you use "Save as." As you move through images, it's easy to get accustomed to using Ctrl/Cmd + S for Save, accidentally saving over a file.

Of course, you're not through with your workflow. But I'm curious what readers think. What's the last step in the workflow that I've left out? Send an e-mail, with "workflow" in the subject line, to HelpLine.

The "Oh-Really?" Factor

Q) Okay, I'm confused! I bought my son a Nikon D50 D-SLR. I understand that there's a 1.5x lens factor when using "film" lenses because the sensor size is smaller than 35mm. The real confusion comes into play when we start talking about the Nikon DX series of lenses. I'm told that they're optimized for the APS-sized sensor, so does that mean that the 1.5x factor no longer applies? Most salespeople and ads say "yes" but a few say "no." What's the real answer here?
Joe Pasquale
Lancaster, Pennsylvania

A) Before we get into lens "factors," let's talk about sensor sizes. There are "full-frame" sensors that are equivalent in size to 35mm film. There are also smaller sensors, which you've referred to as APS-sized. Actually, APS was a new consumer film format developed just before digital started appearing in the marketplace.

Before I go much further, let's deal with the term "lens factor." People have used all sorts of shorthand to talk about it, including "magnification factor," "focal length multiplier," "cropping factor" and, simply, "lens factor."

The key thing to remember is that the focal length doesn't change. The act of putting a lens on a camera body doesn't magically change the focal length. I can go on explaining how the field of view changes or how an object will appear larger in the frame, but no matter what I write, there will be those who will argue about one term or another.

I'd rather see people accept the fact that we're talking about different formats. There's a 35mm format and an APS-C-sized format. There are also 4x5 and 645 formats; someday there may be other formats.

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