MP-E 65mm Tables

<p>I have put together some tables showing working distances for the MP-E 65 mm as well as distance to the lens ring (a proxy for the location of the camera). These were primarily for my own benefit, but I thought others might find them useful. Charts at: <br>

http://gobnat.wordpress.com/2009/11/16/mp-e-charts/<br>

Regards<br>

Brendan</p>

<p>I wonder why don't you measure the distance from the film/sensor plane: every camera has a film/sensor plane mark on the body, that's what it is for...</p>

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<p>why don't you measure the distance from the film/sensor plane</p>

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<p>Because Brendan is measuring WORKING distances, not FOCUSING distances. <br>

At macro magnifications, working distance is more useful.<br>

Regards</p>

 

<p>Michael:<br>

I was measuring by marking off distances on a piece of dowel. My film plane mark is off to the side on the body of the camera and I thought it would be less accurate to measure from there (having to estimate parallel to the object plane offset from the center, compared to centrally to the plane at the top of the lens). I pushed the dowel against the tripod mount to do the measurement. <br>

I found when working on a tripod that the distance from the front of the lens wasn't necessarily all that helpful (as the front of the lens moves with changes in magnification). I was particularly interested in the relative change of position of the camera to achieve focus at different magnifications and to determine that I only needed any fixed point on the camera/lens.<br>

Cheers</p>

<p>No, no, no, nothing wrong with your method and in many ways it is more practical than the standard "working distance" (front of the lens to the focus point) measurement, but the film/sensor plane marker is a better IMO "reference point" than any other part of the camera body: to achieve the min. focusing distance at a given magnification one would normally focus the lens to its closest focusing distance at that magnification and move the camera body (on rails, if possible) to actually get the subject in focus. (Changing the lens focusing distance actually changes the subject magnification.)</p>

<p>Hi Michael<br>

For your reference, I measure the distance from the front of the tripod mount to the film plane indicator at 70 mm (I would guess about +-1mm).</p>

<p>Photo of 6mm white spider on salad bowl (hope this works):</p>

<p> </p><div></div>

<p>Fortunately every day I learn something new<br>

Regards</p>