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sharpness: my perpetural struggle

bobpilot

Washington, US
3834 posts

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"RE: sharpness: my perpetural struggle"

bobpilot Silver Member Nikonian since 08th May 2007
Tue 29-Jan-13 10:54 PM | edited Wed 30-Jan-13 03:55 AM by bobpilot

>
>My copy of the 2008 Gitzo catalog shows the Series 3 tripods
>suitable for lenses up to 300 mm focal length. Series 4
>tripods are rated for 400 mm, and Series 5 for 500 mm. The
>chart does not extend to 600 mm focal length. These limits
>are a function of torsional rigidity.

Does this mean that my 3500 is not adequate?

>
>The Nikon 300 mm lens weighs 6.4 pounds, and the 600 mm F/4.0
>weighs 11.2 pounds. Add the weight of the D3S camera (2.75
>pounds) and the RRS pano system to the 600 mm lens, and your
>are probably at something over sixteen pounds or so, which is
>well within the maximum load limits for the Gitzo Series 3
>tripods: 26.4 pounds for aluminum legs, and 39.6 pounds for
>the carbon fiber legs.

OK, so my tripod is adequate. I'm confused.


>
>As mentioned above, torsional rigidity may be an issue here,
>particularly if the tripod is extended to its full height. Is
>the tripod a three or four section leg model? The 600 mm lens
>has a field of view (FX format) of 4.17 degrees. If you can
>examine the original image above to see if the apparent
>movement is lateral, we may have narrowed the issue down to
>possible torsional movement.


My tripod has three section legs. Is the halo caused by vibration?
>
>Before you purchase another heavier tripod, can you repeat the
>test with the configuration on a concrete slab?

the last shots, not yet posted, was on concrete, subject was a ruler.

>Is your location subject to heavy truck, bus, or other vehicle
>traffic? Our house backs up to a fairly busy arterial road
>and I can feel the vibration in the floor when a heavy truck
>goes thundering by.

steady ground

>
>If this exercise is inconclusive, we may have to look at focus
>issues. I assume that this issue has occurred with the 600 mm
>lens only, correct?

Well, that is another test I need run; try another lens. I had focus issues with my 600 in Zion last month, but I attributed that to my technique. Last fall, I shot a Civil war reenactment, guys in battle, and got some sharp and some not sharp images. (600mm lens)


How should I post the images? my web page, which I can share here via a private link. I can crop tight, but I can't tell if the crop is a 1:1. I will also post some examples here.

This is a hot, active topic! sharpness: my perpetural struggle [View all] , bobpilot Silver Member , Tue 29-Jan-13 06:19 PM
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     Reply message I don't think it's your tripod Bob....
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     Reply message RE: I don't think it's your tripod Bob....
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          Reply message Shoot a ruler at 45 degrees Bob...
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     Reply message There's no need for this...
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     Reply message Post them here Bob...
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          Reply message RE: Post them here Bob...
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               Reply message Sorry, shoot wide open Bob...
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          Reply message f/4 2000 ISO; 1/800
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               Reply message Focus looks pretty good to me Bob...
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Reply message Bob, did you re-shoot that bolt?
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