chuck -

<p>It sounds like you inserted the CF card while the power was on - probably not a best practice, but OK by Canon. You should be able to remove the card and re-boot the camera; a 5D will advise that no card is present. If that fails, I would suspect a bad battery. Otherwise, I would try another CF card ASAP, as you don't want a dead short cooking the internals of the camera.</p>

<p>The only way I know how to change it on a MkII is with the EOS Utility software. On-camera, all you can do is view it or delete it (go to Clear Settings and press Info).</p>

<p>I should have added in my earlier post that the file folder/number alterations in the second Canon only occur if you start taking pictures - if you immediately format the card upon putting it in the second camera, there are no issues. I shuffle a number of cards among my Canons with no problems, as long as you make a practice of immediately formatting a card upon putting it in any camera. Hope that clarifies...</p>

<p>Further to Siegfried's line of thought: I once took a formatted but EMPTY card from one Canon DSLR and put it in another Canon DSLR (from a 20D to a 30D, or from a 30D to a 5D - I can't remember which). The recipient camera began numbering new shots where the other camera had left off! Apparently, the formatting process includes file & folder info from the internal memory of the formatting camera - at least Canon does. The recipient camera then imbeds the new file numbering into internal memory. This pretty much hoses using file numbers as an indication of shutter actuations...</p>

<p>I'm not real familiar with Nikons, but is it possible that you are merely viewing "thumbnail previews" on the camera? I have heard of other camera systems having problems with corrupt full-blown images (JPG and/or RAW), yet the thumbnails can still be viewed.<br>

Lots of good suggestions in this thread - good luck!</p>

<p>I've had great results with Maha (PowerX) Imedion ultra low discharge 2400 mHa rechargeables - both long storage, and fast recycle times. Same concept as the Eneloops.</p>

<p>Kathleen- 1800 X 1200 would be a ratio of 1.5:1, or 3:2, or 6:4, etc. So your problem is not there. I think Bob Atkins probably has it right, with the printers deliberately over-sizing the print to avoid getting a white edge from time to time. In fact, many home printers offer this as a setup option.</p>

<p> </p>

<p>+1 Charles - Canon FTb QL w/50mm 1.4 "chrome nose" lens. Bought it in 1973 and still have it...</p>

<p>I can't speak for the Tamron, but I've had the Canon 17-55 for several years, usually mounted on an old 30D. It is extremely sharp, with excellent color rendition - it is my "go to" combo for landscape pics. I have a great copy, anyway!</p>