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> Tripod stability hanging weight |
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#1
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Tripod stability hanging weight
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"Tea is surely the king of all drinks. It helps against the cold, it helps against the heat,against discomfort and sickness, against weariness and weakness". Heinrich Harrer. |
#2
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Thanks for posting, interesting test results that make sense to this engineer, albeit will surprise many people.
Has to be said though that I agree with one of the comments on the article, main purpose is to stop your rig blowing or getting knocked over by wind. |
#3
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I once made a Benbo-type tripod out of quite large diameter aluminium tubing, to use with a home-made 5x4 camera. It didn't seem ultra-stable, so I balanced a sherry glass filled with water on top of the front standard, to check for vibrations. When I fired the shutter, water rippled in the glass. Not good. So I tied a 7lb bag of potatoes to the tripod, and repeated the test. the water still rippled.
I concluded that adding the weight to the tripod made no difference because the tripod itself was made from what guitar makers call a low damping material. Just rapping the tripod leg with a knuckle would set the whole thing off vibrating. What is needed to stop vibrations is a high damping material. Carbon-fibre fits the bill here. So does wood, though some woods are higher damping than others. With my carbon-fibre tripod, a simple but fairly hefty ball and socket head, and a home-made wooden 5x4 camera made from high-damping wood, I can apply the sherry glass test and get no water ripple at all when the shutter is fired. Alan |
#4
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Quote:
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"Tea is surely the king of all drinks. It helps against the cold, it helps against the heat,against discomfort and sickness, against weariness and weakness". Heinrich Harrer. |
#5
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Norm, I think your idea to use whisky instead of water is an excellent one.
If you send me a bottle, I will definitely give it a try.... Alan |
#6
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Sorry Alan, tried the stability test; after several experiments the whiskey is all gone and I am definitely un-stable and my results are inconclusive. Maybe water is the way to go
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"Tea is surely the king of all drinks. It helps against the cold, it helps against the heat,against discomfort and sickness, against weariness and weakness". Heinrich Harrer. |
#7
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Norm, in the name of scientific integrity you simply must carry on as you were. Changes in any one variable will only lead to more confusion. Whiskey it was, so whiskey it must be.
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Regards, Svend |
#8
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Having read and reread the article I still can't work out whether the centre column was fully extended or not. I always prefer to have the centre column as low as possible and use the tripod legs to get the height.
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#9
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That tripod testing website is a strange one. The guy mentions not long after he started it that he would show how all the various tests he conducted related to image sharpness in real life. And then he didn’t do it - at least I couldn’t find another post about it.
So there’s all this information about torsional rigidity, oscillations, stability, damping, etc, with tripods rated against each other but no proof that any of it matters from a practical viewpoint. Do the measurable differences in testing make any difference to the sharpness of a print? If there are little to no demonstrable real-life differences between tripods then it’s all just geekery as far as I can see. Unless I just missed the post that tied it all together. Sent from my iPhone using Tapatalk |
#10
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I wonder if the old masters used to think about all this ? Or did they spend their time just making great images .............
Neil.
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"The aim of art is to represent not the outward appearance of things, but their inward significance." Aristotle Neil Souch |
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