While the torsion test is an excellent tool, it would be useful to have a test that more directly relates to the sharpness of images coming out of the camera.  I am going to duplicate the razor blade mtf test developed by Jim Kasson.  This test takes an image of a single back-lit razor blade, […]

## Deflection of Test of RRS TFC-14

In the last post I described how to make a deflection measurement on a tripod, and here we will do just that.  I am going to test the same Really Right Stuff TFC-14 tripod used in the torsion spring frequency test, which will allow us to compare and contrast the two methods.  The basic idea […]

## Deflection Testing

I have a series of posts going on using the vibration frequency of a tripod to measure the stiffness and damping characteristics.  I am now going to lay the groundwork for a related but different type of test, the deflection test.  I have found this test used, albeit somewhat dubiously, by one tripod manufacturer.  The […]

## Consistency of the Torsion Test vs Inertia

In order for the torsion spring test described here to be meaningful, it must be both repeatable and applicable over a broad range of conditions.  In this post, we will look at the results of stiffness and damping measurements over a range of inertial masses placed on top of the tripod.  With more inertial mass, […]

In previous posts I described modeling a tripod as torsion spring, and demonstrated the validity of that approach.  In those posts though, I was only looking at vibrations about the vertical axis, corresponding to the camera pointing left and right.  Here I want to take those same methods and look at tripod rigidity about a […]

## Measuring the Stiffness and Damping of a Tripod

In the previous post, I discussed the rationale behind modeling a tripod as a torsion spring.  Here, I am going to measure the stiffness (spring constant) and damping of a tripod and discuss in detail the methods and assumptions made.  As a warning, math will be involved for complete clarity of the procedure.  It is […]