Use a tripod with a remote control, or do your best to hold completely still when taking photos.  On chilly evenings, be sure to breathe in or hold your breath when you take your photo.  This eliminates any strange, “smoky” mists that might just be your breath.  Of course, do not smoke while taking photos! 

If you can take a photo without using your flash, this also helps eliminate strange lights caused by the camera.  (On digital cameras you can use the ‘P’ feature.)  Taking a few photos at a time can also help to give perspective and rule out things like dust, bugs, pollen, etc.  If you have access to more than one camera, try taking pictures with multiple cameras.  Additionally, always use the highest resolution possible.  In order to do this, you may want to invest in some extra memory cards.  Save your photos without compressing them so that they will be easier to analyze at a later time.

When you are using a digital camera, you should be able to enlarge the image and inspect it right away.  In the case that you see something unusual, take more photos from different viewpoints and angles so that you will later be able to tell if it was a camera issue or truly paranormal activity.

Look carefully through all of your photos to make sure you have not missed anything.  Careful inspection can yield great results and finds that may have otherwise been missed.  If you have captured images on film, make sure you tell the developer that you would like all of your pictures returned to you, even those that are dark or abnormal.

Most people find that they capture the best images of paranormal activity at night.  Some feel that this is because the darkness allows orbs to show up better in the photos.  If you plan to go out for a photography session in the dark, it is wise to bring someone along.  Also, always make sure it is legal for you to be on any property where you plan to take photos.  Courtesy and etiquette in places like cemeteries is always appropriate and helpful as well.  As long as it is done safely and intelligently, taking paranormal pictures can be a very interesting and exciting part of the world of photography.