Qadding Up The Bytes

I recently bought a 4GB CompactFlash card for my Nikon D70, and the control panel tells me that I have 1.1K exposures. What's up? Bill Greene

Elizabethton, TN

A The camera estimates how many exposures you can make on the card, according to the jile size you've set up for your pictures. The "1.1K" is shorthand for 1,100 frames—your card will record more or less when you switch between RAW and JPEG, and so on.

Qold flash, new camera

I've received conflicting advice on whether I can use my Nikon SB-25 Speedlight on my Nikon D80,1 understand that the DSO's TTL feature will not work.

got a question?

E-mail us at [email protected] bonnier cotp.com or visit the Tech Support forum atfoiums.Pop Photo.com.

but do I risk damaging the DSO's electronics? Dennis F. Hayes Via e-mail

A Fire away. The SB-25 will not prouide TTL automation, but will offer old-style auto/lash, manual operation, multipop/Iash, and second-curtain sync. Note to readers with similar questions: Compatibility issues are usually detailed in instruction manuals, often near the back of the booklet If you've misplaced yours, most manufacturers offer free PDF downloads o/them—discontinued gear included—on their websites.

What Should I Buy?

Mike Hutchinson of Sarasota, FL, wants to replace his 28-70mm f/2.8 Sigma EX zoom with a tens that can go wider on his Pentax K10D—possibly Sigma's 17-70mm f/2.8-4.5 DC Macro AF. Or, he asks, should he opt for the newer 17-70mm f/2.8-4 Sigma DC OS? As our test in this issue (page 88) shows, the older tens actually performed a notch better than the newer optic on many measures, though the new lens has exceptional image stabilization and the silent HSM focusing motor. But, if price were no object, we'd spring for Pen-tax's own 16-50mm f/2.8 DA* iens ($1,029 street), which combines sharp optics and a fast, constant aperture in a world-cfass build.

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