April | 2012 | Ask Ludwig

Microsoft released a preview version of the app “SkyDrive for Windows” that adds SkyDrive to Windows Explorer and allows accessing SkyDrive as if it were just another folder on the computer.

It is just a simple download and a quick install. This works for Windows 7 and Windows 8.

Here is the download site:

Download SkyDrive for Windows

Click the above link, you will next see the download banner. Click Run. Sign in to your Microsoft Account and follow the dialogs.

In about a minute there will be a SkyDrive listing in Windows Explorer, in the Favorites section as shown in the illustration above.

Presently that entry cannot be expanded like other folders, however it works the same in the main pane.

It takes a bit to synchronize Windows Explorer with your SkyDrive – there is still the Internet download and upload delay – but shortly SkyDrive will work like any other folder.

And, yes, you can now drag and drop folders, including contents and sub-folders, right into SkyDrive.

Do keep in mind that your Internet connect speed will affect how quickly this takes place.

This is a much needed improvement and will make SkyDrive a much more useful feature.

.:.

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The full inquiry stated that the dark spots were usually seen in the sky part in photos and sometime they were almost indistinct, other times very noticeable. Spots in photo The camera used was a DSLR and the lens kept clean.

Here are samples of such spots. These five photos (these are enlarged sections) show the same sky and tree at right. They were taken at different aperture settings, as indicated.

You can see that for large apertures (small f/number) the spots are larger and lighter. In the photos at even larger apertures the spots were not noticeable.

This explains the mystery of sometimes getting spots and not at other times – the aperture will, of course, be different for different photos. So sometimes, with a small aperture (large (f/number), the spots are there, and they are not visible in photos taken at large apertures.

These spots are made by very tiny dust flecks on the rear of the lens. Indeed, this dust was almost invisible to the naked eye. When the lens is stopped down the light bundle forming the image at any one spot is very small and even the tiniest dust particle can cast an appreciable shadow onto the sensor.

It is very easy to miss cleaning the rear of a lens. It is not exposed to the elements except when changing lenses, so you might not think about it. Normally we keep the rear caps on, so there are but a few seconds when dust can get on the rear of the lens. Unfortunately, that is time enough. So be sure to not only keep the front lens surface clean, but the rear of of lens as well.

(Oh, yes, I intentionally got dust on the rear element of a lens to take these photos – the things one has to do to investigate readers’ mysteries!)

.:.