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Reflections on shooting dark birds if flight: 150-600mm zooms vs FF length and FF vs APSc.
#11
 First off; the ticket in the boat window has been sitting in the south facing sun for some years and is faded, but I was showing comparative shots rather than reference images, so I wouldn't worry so about the depth of blacks here.

 

  The lens is composed of 11 elements in nine groups with an additional  protective front element of which 3 are ED.  Earlier manual models were around nine elements.

 The latest VRII model weighs 720 gms less and has an optical formula of 16 elements in 12 groups with 3 ED elements, extra nano-coatings.  In short there has been optical improvements over the last 20 years, since the introduction of my version.   

 

 

  The lens came with it's valise and a review of the day from "Chasseurs D'images" which I've photocopied here, it shows that according to their tests the center of the lens is as sharp as it gets already by F4, and it only nearly reaches very good values, although softer at the edges, at  F5.6 it's as good as it can do across the frame and F8 drops a little further. Personally, I would say that those figures are a little pessimistic.

 

 

  Exposure was 1/2000 F4 at ISO 250 at least for the second shot.

 

   The fact that the Tamron G2 does so well is testimony to the recent advances in tele-zoom lens design in terms of sharpness flare and contrast and has to much extent made the 500mm F4 lenses less expensive on the S/H market. 

 

  It just needs to let in more light!

  


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Reflections on shooting dark birds if flight: 150-600mm zooms vs FF length and FF vs APSc. - by davidmanze - 07-25-2017, 11:07 AM

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