nikonians

Even though we ARE Nikon lovers,we are NOT affiliated with Nikon Corp. in any way.


Sign up Login
Home Forums Articles Galleries News Workshops Shop Recommended
members
All members Wiki Contests Vouchers Apps Newsletter THE NIKONIAN™ Magazines Podcasts Fundraising

sharpness: my perpetural struggle

HBB

Phoenix, US
8642 posts

Click to send email to this author Click to send private message to this author

"RE: sharpness: my perpetural struggle"

HBB Moderator Hal is an expert in several areas, including CLS Awarded for his excellent article contributions to the Resources. Charter Member
Tue 29-Jan-13 10:13 PM | edited Tue 29-Jan-13 10:15 PM by HBB

Bob:

I think Craig may be onto something.

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.

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.

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.

Before you purchase another heavier tripod, can you repeat the test with the configuration on a concrete slab? Then capture a series of identical images (same subject and subject to lens distance, etc.) with the tripod legs at different extensions, from the shortest, collapsed configuration, to fully extended. Start with all sections fully extended, then collapse them one at a time until they are all collapsed. Examine the images at 100 percent (actual pixels) on screen and see if you can identify the configation that begins to show image blur. And, is it blurred in roll, pitch, or yaw? (It may be difficult to distinguish between roll and yaw.)

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.

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?

Regards,

HBB in Phoenix, Arizona
Nikonian Team Member

Photography is a journey with no conceivable destination.

This is a hot, active topic! sharpness: my perpetural struggle [View all] , bobpilot Silver Member, Tue 29-Jan-13 07:19 PM
Subject
ID
Reply message RE: sharpness: my perpetural struggle
1
Reply message RE: sharpness: my perpetural struggle
3
Reply message RE: sharpness: my perpetural struggle
2
Reply message RE: sharpness: my perpetural struggle
4
     Reply message I don't think it's your tripod Bob....
5
     Reply message RE: I don't think it's your tripod Bob....
6
          Reply message Shoot a ruler at 45 degrees Bob...
7
     Reply message RE: sharpness: my perpetural struggle
8
     Reply message There's no need for this...
9
     Reply message RE: There's no need for this...
10
     Reply message Post them here Bob...
11
          Reply message RE: Post them here Bob...
13
               Reply message Sorry, shoot wide open Bob...
15
     Reply message RE: There's no need for this...
14
          Reply message RE: There's no need for this...
16
               Reply message RE: There's no need for this...
19
     Reply message RE: sharpness: my perpetural struggle
12
          Reply message f/4 2000 ISO; 1/800
18
               Reply message Focus looks pretty good to me Bob...
21
                    Reply message RE: Focus looks pretty good to me Bob...
22
     Reply message RE: sharpness: my perpetural struggle
23
Reply message RE: sharpness: my perpetural struggle
17
Reply message RE: sharpness: my perpetural struggle
20
     Reply message RE: sharpness: my perpetural struggle
24
     Reply message RE: sharpness: my perpetural struggle
25
          Reply message RE: sharpness: my perpetural struggle
26
          Reply message RE: sharpness: my perpetural struggle
27
               Reply message RE: sharpness: my perpetural struggle
28
                    Reply message RE: sharpness: my perpetural struggle
29
     Reply message RE: sharpness: my perpetural struggle
31
          Reply message RE: sharpness: my perpetural struggle
32
               Reply message RE: sharpness: my perpetural struggle
33
               Reply message RE: sharpness: my perpetural struggle
35
               Reply message RE: sharpness: my perpetural struggle
34
                    Reply message RE: sharpness: my perpetural struggle
36
                    Reply message RE: sharpness: my perpetural struggle
37
Reply message RE: sharpness: my perpetural struggle
30
Reply message Bob, did you re-shoot that bolt?
38
Reply message RE: Bob, did you re-shoot that bolt?
39
     Reply message RE: Bob, did you re-shoot that bolt?
40
          Reply message RE: Bob, did you re-shoot that bolt?
41
          Reply message RE: Bob, did you re-shoot that bolt?
42
Reply message RE: sharpness: my perpetural struggle
43
Reply message RE: sharpness: my perpetural struggle
44
     Reply message RE: sharpness: my perpetural struggle
45