In Memoriam – Charlie Russell

January 27th, 2012

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Pentax K5 In Camera Correction

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.

 

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smc Pentax A* 300 CA & Sharpness

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:

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Luck Shots & Image Stacking

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. ]

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Do you know what I am?

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!

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….

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Pentax K-5 Time Lapse Guide

January 5th, 2012

Overview

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.

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The Myth of Solarization

December 26th, 2011

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.

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“Honey, what did you buy…”

November 18th, 2011

Fractal time lapse outtakes

November 13th, 2011

Sometimes I get some spurious shots while setting up a time lapse shoot.   Here are a couples that looked sort of interesting.