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Hold that pose

 
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jaharris1001



Joined: 29 Jun 2007
Posts: 319
Location: Deltona Florida

PostPosted: Thu Apr 24, 2008 5:45 pm    Post subject: Hold that pose Reply with quote

a coopertive subject Wink


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Jim

"I'm growing older,, but not up " Jimmy Buffett
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Roy Patience



Joined: 05 Aug 2006
Posts: 213
Location: Sourthern California

PostPosted: Fri Apr 25, 2008 12:38 am    Post subject: Reply with quote

Jim,

This really grabs your attention. I really like the sharpness of the dragonfly and the contrast between it and the background.

What focal length and aperture? I'm trying to decide between and new 150 mm and 180 mm.

Thanks for sharing.

Roy
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jaharris1001



Joined: 29 Jun 2007
Posts: 319
Location: Deltona Florida

PostPosted: Fri Apr 25, 2008 8:23 am    Post subject: Reply with quote

Roy Patience wrote:
Jim,

.

What focal length and aperture? I'm trying to decide between and new 150 mm and 180 mm.

Thanks for sharing.

Roy

Thanks Roy,, this was shot using a Sigma 105mm macro lens with a f11 aperture. Thanks for looking and commenting,, good luck with your new lens Wink
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Erland R.N.



Joined: 07 Aug 2006
Posts: 335
Location: Kolding, Denmark

PostPosted: Fri Apr 25, 2008 12:19 pm    Post subject: Reply with quote

A nice photo of the female Blue Dasher, showing the heat-reducing obelisk posture.
I would have preferred a bit more blurred background, which could have been achieved by a slightly larger aperture, or a bit less distance to the dragonfly (or a longer lens like the 150 mm). But to be honest I think the dragonfly still stand out clear from the background.

Erland
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jaharris1001



Joined: 29 Jun 2007
Posts: 319
Location: Deltona Florida

PostPosted: Fri Apr 25, 2008 3:11 pm    Post subject: Reply with quote

Thanks Erland,, how do you tell the males from the females ? I feel as you do on the backround,, like you said if I used a larger aperture I think it would have been better,, and that big stick on the bottom left is disstracting too,, I do like the dragon and her pose though,, thanks for commenting,,

Jim
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Jim

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Erland R.N.



Joined: 07 Aug 2006
Posts: 335
Location: Kolding, Denmark

PostPosted: Fri Apr 25, 2008 4:38 pm    Post subject: Reply with quote

jaharris1001 wrote:
Thanks Erland,, how do you tell the males from the females ?
Jim

Jim, in many of the dragonflies (like this species) the appendages at the end of the abdomen, differs in appearence between males and females.
The males got two long upper appendages, and they are rather long and close to each other.
The females appendages are often placed with some more distance between them (seen clearly in this picture), and they are in many species somewhat shorter.

Males always got a third appendage: the inferior one (lower), below the two supperior (two upper) appendages. The male use those three appendahes to grab the females head, so the mating wheel can be formed.

The females two appendages serves no function.

Also males got the secondary genitalia at the other end of the abdomen, under the 2nd segment.

Many females have what is called a vulvar scale (like the species here), where eggs will exit when laid, while other species have a functional ovipositor, the is like a needle that is stuck into plants etc. when eggs are laid. Both vulvar scale and ovipositor is placed under the 8/9th segment, that is quite close to the tip of the abdomen.

In many species females have a thicker abdomen.

In many species colours can tell which sex it is, as the males mature to a different colour.

In your previous picture of a male, I could see it was a male, because blue colour was forming on the upperside of the abdomen.

I got a page comparing two very similar dragonfly species, and here you can see females and males, and some of the differences I mentioned above:

http://home1.stofanet.dk/erland_refling/odo_striolatum_vulgatum_uk.htm

Hope this makes sence

Erland
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