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Thread started 28 Mar 2006 (Tuesday) 05:40
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Measuring your bugs

 
BigAl-SA
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Mar 28, 2006 05:40 |  #1

I thought of this when I was taking pics of a tape measure while testing various combinations of extension tubes.

Take a pic of a tape measure at the lens magnification (eg 1:1) with the required tubes in place. Copy this pic and paste it as a new layer on an *uncropped* pic of the bug. Reduce the opacity of the tape layer until both the bug and the tape are visible. Rotate the tape layer until it is aligned with the bug.

IMAGE: http://bigal-sa.smugmug.com/photos/61906074-M.jpg

Here we have a small fly body length 3mm and body + wings 4mm. This can be reasonably accurate if the bug's body is parallel to the plane of the sensor.

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Omri ­ Alon
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Mar 28, 2006 05:47 |  #2

That is a great idea! The problem is when they are not parallel to the sensor.

edit: they = the bugs


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LordV
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Mar 28, 2006 06:57 |  #3

Neat Idea Al,
I almost do a similar thing- having got an Idea of the FOV widths at the various magnifications I use, I just take measurements off the PC screen with a ruler and ratio them.
eg at 1.5:1 FOV width= 14.7mm
If bug is 5cm on screen and screen width is 20.7cm then bug length= (5/20.7)*14.7= 3.55mm. Problem comes when you are not shooting at minimum focus :)
Brian V.


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Omri ­ Alon
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Mar 28, 2006 07:14 as a reply to  @ LordV's post |  #4

LordV wrote:
Neat Idea Al,
Problem comes when you are not shooting at minimum focus :)
Brian V.

That's not a problem for me :lol: I alway want more magnification!


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Action_Man
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Mar 28, 2006 08:53 |  #5

Most times i just visually estimate the size, i start with imperial then convert to metric :) ...




  
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Measuring your bugs
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