Linux: /etc/nslcd.conf gets re-written and LDAP stops working

August 15th, 2013 googlefood, Howto

Googlefood. Not interesting to most people.

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OpenLDAP 2.4: Adding overlays

June 2nd, 2013 googlefood, Howto

Mostly googlefood, since I spent way too long looking for this.

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Ubuntu: Boot fails with message “Can’t load firmware file bnx2/bnx2-mips-”

March 16th, 2012 googlefood

Googlefood article; just documenting the solution I eventually found.
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ssh, PAM, and radius

March 13th, 2012 googlefood

Yawn, googlefood.

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Extension Tubes and Ring Flash?

January 30th, 2012 Experiments, Photography

A reader asks on my Comparing macro lenses to extension tubes page whether or not hot-shoe or ring flash will work with extension tubes, or whether the working distance is too close.

Answer #1: I don’t know. Answer #2: Let’s find out.

I set up a tripod, put a 6 mm extension tube on a 16 mm lens, and asked Uiharu to model for me. The crinkled paper was intended to give a bit of light bounce from the room lights, but I ended up shining a flashlight into the paper to push up the brightness.

Extension Tube Test Setup.

Setup for the extension tube test.

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