ted_kahn

<p>Windows 7 Home Premium can only address 16 GB of RAM. To go higher you need to buy Windows 7 Professional, Enterprise, or Ultimate (if you can still get them), or Windows 10. From the Microsoft website:</p> <h2>Physical Memory Limits: Windows 7</h2> <p>The following table specifies the limits on physical memory for Windows 7.</p> <table summary="table"> <tbody> <tr><th scope="col">Version</th><th scope="col">Limit on X86</th><th scope="col">Limit on X64</th></tr> <tr> <td data-th="Version">Windows 7 Ultimate</td> <td data-th="Limit on X86"> <p>4 GB</p> </td> <td data-th="Limit on X64"> <p>192 GB</p> </td> </tr> <tr> <td data-th="Version">Windows 7 Enterprise</td> <td data-th="Limit on X86"> <p>4 GB</p> </td> <td data-th="Limit on X64"> <p>192 GB</p> </td> </tr> <tr> <td data-th="Version">Windows 7 Professional</td> <td data-th="Limit on X86"> <p>4 GB</p> </td> <td data-th="Limit on X64"> <p>192 GB</p> </td> </tr> <tr> <td data-th="Version">Windows 7 Home Premium</td> <td data-th="Limit on X86"> <p>4 GB</p> </td> <td data-th="Limit on X64"> <p>16 GB</p> </td> </tr> <tr> <td data-th="Version">Windows 7 Home Basic</td> <td data-th="Limit on X86"> <p>4 GB</p> </td> <td data-th="Limit on X64"> <p>8 GB</p> </td> </tr> <tr> <td data-th="Version">Windows 7 Starter</td> <td data-th="Limit on X86"> <p>2 GB</p> </td> <td data-th="Limit on X64"> <p>N/A</p> </td> </tr> </tbody> </table> <p>In any event, the 12 GB you had before should have allowed your computer to run well, so that can't explain why it slowed to a crawl. You seem to be saying that when you cleaned out some of the dust the computer did speed up to some extent. That might mean you need to clean it more thoroughly. Also, as long as you have the case open, turn on the computer and check to make sure all the fans are running. In particular, if the fan that exhausts the case or the fan on the CPU cooling fins isn't running, the CPU may overheat, causing it to automatically slow down. Of course there are many other things that can cause a computer to slow down. It's a good idea to use the Task Manager to see if there's a process that's using a lot of resources. I've also found that if an update for the operating system or for a browser such as Firefox has been downloaded but not yet installed, that can make the computer very slow.</p> <p> </p>

<p>Is it possible this only happens when you change lenses under bright lighting conditions? With no lens on the camera, light may be entering the front of the camera, bouncing around inside, and reaching the film somewhere.</p>

<p>You need to be viewing a collection or a folder to be able to create a custom order. Is that what you're doing, or are you viewing all photographs?</p>

<p>This seems like a perfect situation for having two catalogs. You won't be able to search across all your images (professional and personal) at the same time, but it doesn't sound like you want to be able to do that anyway. By the way, you can export presets from one catalog and import them into another. You can also export and import lists of keywords, but I guess you wouldn't be using the same keywords for both catalogs since they'll contain very different images.</p>

<p>I imagine you've already checked this, but in case you haven't -- you should print a nozzle check pattern and examine it closely to make sure it's perfect. Even a small dropout in one color can cause banding.</p>

<p>Focal plane shutters are extremely delicate. Because they have to accelerate and decelerate very rapidly the shutter curtains need to have very low mass. They're essentially made out of metal foil. If you touch a sensor with your finger it just means you'll need to clean the sensor, but if you touch the curtains of a focal plane shutter with your finger you'll probably need a new shutter.</p>