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Little Worm...

 
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Ken Ramos



Joined: 27 Jul 2006
Posts: 7048
Location: lat=35.4005&lon=-81.9841

PostPosted: Sat Apr 26, 2008 8:04 am    Post subject: Little Worm... Reply with quote

No not me...this! Laughing



T'was a lazy Saturday, spring morning. Clouds rolling in from the west promising rain and adding a slight overcast light though there was still a measure of morning sun. This was in partial shade and I just happened to come across it. I was looking intently for subjects but still just luck that I noticed this little creature. Very Happy

Canon EOS 20D
Manual mode, hand held
1/60 sec. @ f/6.3 ISO 100
Canon EF-S 60mm f/2.8 Macro USM
Canon 430EX Speedlite ETTL @ -1, off camera
PP: Photo Impact 6 Very Happy
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jmlphoto



Joined: 10 Aug 2007
Posts: 269

PostPosted: Sat Apr 26, 2008 11:38 am    Post subject: Reply with quote

great shot ken, caught him in the act. just wondering why its has that black shadow on the back.
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Jordan L. photo southern california.
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Ken Ramos



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

PostPosted: Sat Apr 26, 2008 12:19 pm    Post subject: Reply with quote

Jordan asked:
Quote:
just wondering why its has that black shadow on the back.


Could be the due to the translucent skin of the worm being viewed edge on. Think

Thanks Jordan Very Happy
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rjlittlefield
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA

PostPosted: Sat Apr 26, 2008 7:17 pm    Post subject: Reply with quote

Is this flashed from the upper right? If so, maybe a flash shadow. Confused

--Rik
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Ken Ramos



Joined: 27 Jul 2006
Posts: 7048
Location: lat=35.4005&lon=-81.9841

PostPosted: Sat Apr 26, 2008 7:26 pm    Post subject: Reply with quote

Rik asked:
Quote:
Is this flashed from the upper right? If so, maybe a flash shadow.


The flash was centered up and over the lens and pointed slightly downwards on this one. Very Happy
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acerola



Joined: 13 Dec 2006
Posts: 251
Location: Hungary

PostPosted: Mon Apr 28, 2008 2:05 am    Post subject: Reply with quote

I think that dark outline is come from the two different light source. There is an ambient light you capture with 1/60 s and the flash. If you take this picture without the flash, the worm will be dark. The camera close by cast a shadow to the worm.
So the dark outline is this darker worm. The camera moved a little to the right (if it was second curtain) and at the end the flash freeze a second more sharper image.
I use this two light source technique very much, but I like the under exposition of the ambient light with 2 EV. I then get a darker background (I did mot like black very much). It is emphasize the subject and this dark outline is almost not visible.
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Péter


Last edited by acerola on Mon Apr 28, 2008 6:17 am; edited 1 time in total
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Ken Ramos



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

PostPosted: Mon Apr 28, 2008 3:32 am    Post subject: Reply with quote

Well, I guess that answers that! Laughing I did not know, thanks Péter Very Happy
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Harold Gough



Joined: 09 Mar 2008
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Location: Reading, Berkshire, England

PostPosted: Mon Apr 28, 2008 5:02 am    Post subject: Reply with quote

It looks like a sawfly larva.

Harold
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Ken Ramos



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PostPosted: Mon Apr 28, 2008 4:25 pm    Post subject: Reply with quote

I Googled "sawfly larvae" there Harold, appears that you are right. Thanks for the ID. Very Happy
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Harold Gough



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Location: Reading, Berkshire, England

PostPosted: Tue Apr 29, 2008 2:00 am    Post subject: Reply with quote

Watch out for some species doing this kind of thing when alarmed by your approach (scroll down to first post):

http://www.wildaboutbritain.co.uk/forums/insects/12851-sawfly-caterpillars.html

I find one such species on rose leaves in my garden.

Harold
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Ken Ramos



Joined: 27 Jul 2006
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PostPosted: Wed Apr 30, 2008 4:33 am    Post subject: Reply with quote

Couldn't find out much about this "defense mechanism." Seems to be often referred to as "easy bleeding," a secretion of hemolymph. Must be quite distasteful to predators, unlike the strong alkaloid secretions of other caterpillars which are irritants or harassing agents I believe. Think

Thanks Harold Very Happy
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rjlittlefield
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Joined: 01 Aug 2006
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PostPosted: Wed Apr 30, 2008 8:06 am    Post subject: Reply with quote

I'm confused. I thought the article was talking about tails-in-the-air posture. Didn't notice anything in there about secretions, maybe I overlooked it? Confused

I haven't seen many sawfly larvae, but I've had a soft spot in my heart for them ever since they were one of my great "Oops!" experiences. I found a batch, assumed they were moth larvae, and spent quite a long time trying to run them through the identification keys......before happening to back up and try it from the beginning. Then I discovered that I had failed to notice the prolegs...too many and too soon! Oops! But a memorable experience. Laughing

I notice this one is solitary. The others I've seen came in bunches. Were there more of these around?

--Rik
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rjlittlefield
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PostPosted: Wed Apr 30, 2008 8:12 am    Post subject: Reply with quote

Peter, thanks for that explanation. It took me several readings, but finally I caught on. The explanation is very clear, by the way -- purely a case of my head running slow, and in the wrong direction! Laughing

--Rik
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Ken Ramos



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

PostPosted: Wed Apr 30, 2008 3:24 pm    Post subject: Reply with quote

Rik asked:
Quote:
I notice this one is solitary. The others I've seen came in bunches. Were there more of these around?


Nope, this little feller was all by his lonesome. I never considered that though, you're right. All the reference images I came across showed them aggragated. Think
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