• Featured Articles RSS Feed

      Published on 10-13-2012 01:32 PM
      Article Preview

      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
      Article Preview

      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 ...

      Page 7 of 15 1 2 3 4 5 6 7 8 9 10 11 12 13
    • Most Recent Threads

      Tim Foltz

      American Coot feeding it's Chick

      Thread Starter: Tim Foltz

      Canon 1DMKIII • 500 mm • 1/1250 • f/5.6 • ISO 320 • handheld manual

      Thanks for looking.


      Last Post By: Tim Foltz Yesterday, 10:19 PM Go to last post
      Glenn Pure

      Red-capped Plover

      Thread Starter: Glenn Pure

      This bird is found around Australia at both salt and fresh water sites. This one was taken in a coastal area (the Carlo Sandblow) at Rainbow Beach

      Last Post By: Tim Foltz Yesterday, 09:42 PM Go to last post
      William Dickson

      Portrait in Motion

      Thread Starter: William Dickson

      Canon 1DX
      f/4 500mm with 1.4
      ISO 800

      This is one from a couple of weeks ago when I was photographing

      Last Post By: Glenn Pure Yesterday, 06:07 PM Go to last post
      Glenn Pure

      Two giraffes

      Thread Starter: Glenn Pure

      I have quite a few giraffe shots from Africa in May and hope to share a few more before the month is out and the 'horned' theme closes. I like

      Last Post By: Glenn Pure Yesterday, 05:14 PM Go to last post
      Gabriela Plesea

      Up Close and Personal (C)

      Thread Starter: Gabriela Plesea

      Hello Friends,

      It so happens that I have had some amazing encounters with wildlife lately which I enjoyed tremendously, but not many photographic

      Last Post By: Glenn Pure Yesterday, 05:04 PM Go to last post
      Geoffrey Montagu

      American White Pelican

      Thread Starter: Geoffrey Montagu

      This pelican image was captured in southern Texas a week ago, and may or may not fit the theme, because they are found near coastlines in winter, and

      Last Post By: Glenn Pure Yesterday, 06:04 PM Go to last post
      Raybel Robles

      Copper-rumped Hummingbird

      Thread Starter: Raybel Robles

      Taken a couple of weeks ago in Tobago. I visited the same place multiple days to get this type of photo. Most days the light is never perfect, from bad

      Last Post By: Tim Foltz Yesterday, 09:44 PM Go to last post
      Joseph Przybyla

      Wood Duck (m)

      Thread Starter: Joseph Przybyla

      I captured this image at Lake Morton in Lakeland, Florida. The ducks are beginning to arrive in Florida. Comments and critique welcomed and appreciated.

      Last Post By: Glenn Pure Yesterday, 05:56 PM Go to last post

      Red-tailed hawk

      Thread Starter: arash_hazeghi

      RTH seeking breakfast, from SoCal. vehicle used as a blind

      5D4 600II + 1.4X III. ISO 2500. f/5.6 at 1/2000sec. hand held. processed

      Last Post By: Tim Foltz Yesterday, 09:47 PM Go to last post
      Isaac Grant

      Wood Duck Wings

      Thread Starter: Isaac Grant

      This Wood Duck was photographed shortly after dawn in Central Park. There are still leaves on some trees and their reflection is turning the water beautiful

      Last Post By: Glenn Pure Yesterday, 05:47 PM Go to last post
      Bill Dix

      Least Grebe Adult

      Thread Starter: Bill Dix

      This is the parent of the chick from my previous post. This was captured about four hours earlier, in somewhat better light (overcast). Estero Llano

      Last Post By: Glenn Pure Yesterday, 05:41 PM Go to last post
      William Dickson

      Red Grouse

      Thread Starter: William Dickson

      Canon 1DX
      f/4 500mm
      ISO 1250

      I took another trip to the Glen at the weekend for the Red Grouse. I was

      Last Post By: Glenn Pure Yesterday, 05:34 PM Go to last post
      Mike Poole

      Exhaling Triggerfish

      Thread Starter: Mike Poole

      I've always had a little trouble getting close at the right angle to these little Picasso Triggerfish. They've always tended to turn

      Last Post By: Jonathan Ashton Yesterday, 11:31 AM Go to last post
      Arthur Morris

      Clean, tight and graphic or wider with habitat?

      Thread Starter: Arthur Morris

      This image was created at Fort DeSoto on the morning of November 11, 2017 with the Induro GIT304L Grand Series 3 Stealth Carbon Fiber Tripod/Mongoose

      Last Post By: Glenn Pure 11-20-2017, 07:51 PM Go to last post
      Arthur Morris

      Fort DeSoto Early Winter IPT/$100 Discount for BPN Members

      Thread Starter: Arthur Morris

      Recent Fort DeSoto Images

      From bottom left clockwise back to center: Great Egret, blasting sunrise highlights; Black Skimmer, winter plumage

      Last Post By: Arthur Morris 11-20-2017, 09:05 AM Go to last post
    Web Analytics