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Eye of a Fritillary butterfly

 
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17872
Location: Richland, Washington State, USA

PostPosted: Sun Aug 12, 2007 9:45 pm    Post subject: Eye of a Fritillary butterfly Reply with quote



In an earlier posting, I mentioned that the eyes of many butterflies have numerous fuzzy dark spots that appear to move, following the movements of the observer.

The fuzzy dark spots are what's shown here, although you'll have to take my word about the movement part. With the butterfly under a stereo scope, the dark spots appear to be deep within the eye (because each of my eyes sees them at a different position) and they definitely track my viewing angle.

By the way, the small dark spots and the sharply edged dark spots are also optical effects. They are apparently caused by small sharp irregularities in the curvature of the compound eye. Under the scope, it's like watching fuzzy dark spots move behind a lens that is spotted and streaked with water.

The subject is a live Fritillary butterfly, genus Speyeria. It's S. zerene, I think, but this group is a bit troublesome.

--Rik
Technical: Canon 300D with Olympus 38mm bellows lens at f/16, aggressively sharpened to compensate for diffraction blurring. Dual fiber halogen illumination, Kleenex diffuser. The subject is live, restrained in a wing clamp used for feeding.
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Ken Ramos



Joined: 27 Jul 2006
Posts: 6947
Location: lat=35.4005&lon=-81.9841

PostPosted: Mon Aug 13, 2007 3:00 am    Post subject: Reply with quote

Pretty nice image there Rik. I was wondering how you kept a live subject like this still enough for a shot or two, then I saw the "wing clamp" thing at the bottomm of your post. Very Happy
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Ken 2014
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17872
Location: Richland, Washington State, USA

PostPosted: Mon Aug 13, 2007 8:27 am    Post subject: Reply with quote

Ken,

Butterflies often get quite passive when their wings are held and there's nothing around for them to try reaching with their feet. This was a 1.3 second exposure!

With luck, I can get some eggs from this little gal. I haven't had any of them to work with since stacking became practical. I'll be very interested to see what they look like.

--Rik

Reference: The rearing methods I use are those of Mattoon et.al., described in this paper: REARING TECHNIQUES FOR SPECIES OF SPEYERIA (NYMPHALIDAE), published in Journal of the Lepidopterists' Society, 1971-25(4)247. The paper can be accessed by visiting http://www.lepsoc.org/ and searching for speyeria rearing. As of today, it'll be the first hit. The URL of the full paper is http://research.yale.edu/peabody/jls/pdfs/1970s/1971/1971-25(4)247-Mattoon.pdf , but you'll have to copy and paste it into your browser's address bar because the parentheses do not play nicely with the forum's [url] tags.
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Walter Piorkowski



Joined: 14 Aug 2006
Posts: 647
Location: South Beloit, Ill

PostPosted: Mon Aug 13, 2007 10:42 am    Post subject: Reply with quote

Very interesting subject matter and image Rik. I learn somthing new every time I enter this form. I'll have to check this out myself sometime.

Walt
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jmlphoto



Joined: 10 Aug 2007
Posts: 269

PostPosted: Mon Aug 13, 2007 11:06 am    Post subject: Reply with quote

now thats some detail great job, the eye is fantastic.
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beetleman



Joined: 04 Aug 2006
Posts: 3578
Location: Southern New Hampshire USA

PostPosted: Sun Aug 19, 2007 5:33 am    Post subject: Reply with quote

An excellent photo Rik.
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