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Hairy eye of Painted Lady, stereo with CamRanger and 4X obj

 
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17390
Location: Richland, Washington State, USA

PostPosted: Mon Jul 07, 2014 12:15 am    Post subject: Hairy eye of Painted Lady, stereo with CamRanger and 4X obj Reply with quote

Nothing fancy here, just a crossed-eye stereo showing the remarkably hairy eye of a Painted Lady butterfly (Vanessa cardui):



Discoloration in the eye is due to several years of drying in this old specimen.

The setup for this shot was pretty simple: just a 4X objective (Nikon CFI BE) stuck on the end of a 55-200 mm telephoto lens on a Canon T1i camera. Focus stepping by AF motor control, using the CamRanger. (I couldn't resist assembling a stack of "supporting documentation".)



Here's the entire frame. There is some vignetting because I zoomed out the telephoto in order to slightly widen the field. EXIF data reports 155mm, implying about 3X actual magnification.



Focus stepping is 71 frames at the smallest increment of the CamRanger. The small increment is required despite effective f/15 because the telephoto is front-focusing. The smallest increments of focus are very small when the telephoto is used by itself, but they advance the front of the lens by an amount that is significant compared to the roughly 50 micron DOF of an NA 0.1 objective.

The CamRanger currently only allows 50 frames per stack, so I just ran one stack of 50, then immediately another stack to get the rest of the required frames. The second stack ran into the infinity focus stop of the lens and produced a bunch of identical frames, so I truncated the stack before processing it.

ISO 100, 1/8 second. The CamRanger requires that the camera be in live view mode, so with Canon cameras that automatically implies EFSC.

Zerene Stacker PMax, no retouching. The stereo is +-2%.

BTW, I went looking for an SEM photo of the eye structure, but all I could find was a closeup of a few ommatidia and the bases of some hairs. If somebody can find one comparable to the overview shown here, I would appreciate the link. Thanks!

--Rik
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Saul



Joined: 31 Jan 2011
Posts: 718
Location: Naperville, IL USA

PostPosted: Wed Jul 09, 2014 8:49 pm    Post subject: Reply with quote

Hi Rik,
How much time takes for CamRanger to take these 50 photos using AF motor ? Very nice setup by the way, worked out perfectly Smile
Thanks,
Saul
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17390
Location: Richland, Washington State, USA

PostPosted: Wed Jul 09, 2014 11:03 pm    Post subject: Reply with quote

According to timestamps on the image files, it was 170 seconds between frame #1 and frame #50, so about 3.5 seconds per frame.

Yes, this simple setup worked very well with the camera on a stack of books. I tried also with the camera on a flimsy tabletop tripod, but that had too much undamped vibration and did not give sharp pictures unless I shot with flash.

--Rik
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