Archive for January, 2012

In Memoriam – Charlie Russell

Friday, January 27th, 2012


Pentax K5 In Camera Correction

Thursday, January 19th, 2012

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.



smc Pentax A* 300 CA & Sharpness

Thursday, January 19th, 2012

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:


Luck Shots & Image Stacking

Sunday, January 15th, 2012

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. ]


Do you know what I am?

Thursday, January 12th, 2012

One of our profs gave me one of these, then one turned up in the DPR Pentax SLR forums.     Confirming my theory that some thing spread like viruses, and some like a fungus.   The latter being the “yesterday I was unaware they existed, today they are everywhere” emergency pattern.

Uber Tripod Lives!

Friday, January 6th, 2012

After some minor repairs, the uber tripod is ready for action.   Its sort of an engine block suspended on aluminum flag poles….


Pentax K-5 Time Lapse Guide

Thursday, January 5th, 2012


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.