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      Published on 10-13-2012 01:32 PM
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      This is the assembled Lens Align Mark II. Thanks to Michael Tapes for the image.

      Why Micro-adjust?

      It’s simple. While the images made with most rigs are sharp, in many cases, they will be that much sharper with more fine detail once a given camera body/lens or camera body/TC/lens combination has been properly micro-adjusted. While some of my rigs are spot on, others have needed front- or back-focusing corrections as high as +/- 12 units.

      The Lens Align Mk II; Micro-adjusting Magic

      Ever since the introduction of digital camera bodies that feature micro-adjustments for individual lenses, folks--including me--have been searching for a quick, easy way to make those micro-adjustments. When I was working on the 7D and the Mark IV User's Guides, I worked hard on developing a make-it-yourself cardboard rig that was a big improvement on the original version. But in reality, it did not offer the needed precision. And in addition to the extremely low cost, the rig took up lots of space--heck, it was huge, and using it was tedious.
      Published on 09-18-2012 10:19 PM
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      I was walking along a narrow path next to Little Estero Lagoon while scouting for a Southwest Florida IPT. About 50 yards ahead of me there were two American Oystercatchers foraging. The only problem was that 35 yards ahead of me a photographer was lying on his belly photographing the pair of attractive birds. They were catching big worms and the light was lovely… What to do? The guy was on the wet sand was facing away and was not at all aware that I was there. If I called to him (to ask if I could join him) I risked scaring the birds away. So I stood there for 30 minutes and watched with a bit of envy. Finally I decided that I would join him by starting my crawl from way back so as not to flush the birds.
      I advanced slowly a few yards, remaining well outside of this species usual circle of fear. I slowly and carefully got down on one knee and the birds did not notice me, but as I lowered myself to the prone position, ...
      by Published on 08-06-2012 07:27 AM

      This post is derived from my web article: http://www.clarkvision.com/articles/iso

      What is ISO on a digital camera?

      Reading manufacturer literature, review sites, and online discussions, one is led to believe that ISO changes sensitivity, and changes exposure. These ideas are both incorrect.

      Myth #1: ISO changes sensitivity. False! Digital cameras have only one sensitivity, given by the quantum efficiency of the sensor, and the transmission of the optics and filters over the sensor. ISO is simply a post-sensor gain applied to the signal from the sensor.

      Myth #2: ISO changes exposure. False! When you change ISO on a digital camera, two things are changed ...

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