The Pentax K-5 includes the ability to perform in-camera correction for geometric distortion and lateral chromatic aberration. Here is an example of both enabled / disabled for the 18-55mm kit lens at 18mm where both distortion and CA are abundant.
Just a quick testimony to old Pentax primes… This is a quick comparison of center and and edge… ( Click on the images to see them full sized. ) First here is the target:
I often see people stacking small numbers of photos in an attempt to improve image quality. Sometimes this works as expected, and other times…. not so much. One of the major issues with this technique is that it can actually yield lower image quality when the individual frames are subject to atmospheric distortions or occasional vibrations in the camera and mount system itself.
[ Left to right: One of the less blurry stills, 100 image stacked, one of the more blurry stills. ]
After some minor repairs, the uber tripod is ready for action. Its sort of an engine block suspended on aluminum flag poles….
The Pentax K-5 is an extremely competent camera, and offers an APS-C sensor with best of class low light performance. As is typical with Pentax, there are many in-camera processing and shooting features which can be used in combination, maximizing the flexibility of the K-5. The K-5 includes 3 axis image stabilization, in camera HDR, flexible bracketing, in camera LCA and geometric distortion correction when used with Pentax lenses. It makes an excellent instrument for time lapse work for a number of reasons, but it also presents some difficulties which can make it somewhat more difficult as well. The aim of this guide is to cover these features broadly and how these fit into the usual aspects of time lapse.
Solarization of modern films while in the camera is largely a myth. Evidence for this is all around you if you have been shooting film. Look at the leader on ANY negatives you’ve had processed, which would have been exposed to the light since it was sticking out of the canister. Its black. Here is an example…
The negative on the left was handled in typical way, so perhaps 2-5 minutes of cumulative exposure to ambient light. The one of the right sat on a shelf in my office for 14 months, fully exposed to the sun for about 2 hours per day! There is no noticeable inversion, only a slight difference in light leakage past the felt.