www.photomacrography.net :: View topic - nice stereo of doli
www.photomacrography.net Forum Index
An online community dedicated to the practices of photomacrography, close-up and macro photography, and photomicrography.
Photomacrography Front Page Amateurmicrography Front Page
Old Forums/Galleries
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
nice stereo of doli

 
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Technical and Studio Photography -- Macro and Close-up
View previous topic :: View next topic  
Author Message
BugEZ



Joined: 26 Mar 2011
Posts: 769
Location: Loves Park Illinois

PostPosted: Thu Jul 04, 2019 6:04 pm    Post subject: nice stereo of doli Reply with quote

Here is a nice stereo of a doli with lovely stripes on the ommatidia.

I used my 10 X oly on my 200mm Pentax prime, Pentax K-01 mirrorless, LED lighting.

I collect ~ 15 images per minute on my rig. So the stacks of ~150 images require about 10 minutes each. After turning the RAW files into JPG's I run them through Zerene, and create a left, right and center image for stereo.
Each processed stack is a combination of PMAX and DMAP. I went after some dirt on the sensor with Photoshop. Processing is the bottleneck as I spend about an hour per stereo image. I pass my stereo images through StereoPhotoMaker to let it do its magic and apply borders.

Still, the tiny bug (~ 2.5mm in length) is lovely and worth the effort.



full size on Fllickr here...

stereo 2a by Keith Short, on Flickr

Keith
Back to top
View user's profile Send private message
mawyatt



Joined: 22 Aug 2013
Posts: 2076
Location: Clearwater

PostPosted: Thu Jul 04, 2019 7:05 pm    Post subject: Reply with quote

Keith,

Great stereo image, it just "jumps" out at you Very Happy

Best,
_________________
Research is like a treasure hunt, you don't know where to look or what you'll find!
~Mike
Back to top
View user's profile Send private message
BugEZ



Joined: 26 Mar 2011
Posts: 769
Location: Loves Park Illinois

PostPosted: Thu Jul 04, 2019 8:20 pm    Post subject: Reply with quote

Mawyatt wrote
Quote:
..just sort of jumps out at you!


Yes, a good stereo image is a source of joy.

Years ago I made these the hard way by rotating the bug by a few degrees between stacks. Then I discovered how to make “synthetic” stereos using Zerene. Much easier and better results with Zerene.

The males Sympycnus lineatus are only around in my bushes for a few weeks early in the summer then disappear. The females live a bit longer. They have larger mouth parts and a bit of face between the eyes. Females are around most of the summer.

A female here

CDCD1E00-4D1B-4B8E-BD6F-0F35314E498E by Keith Short, on Flickr

K
Back to top
View user's profile Send private message
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 19887
Location: Richland, Washington State, USA

PostPosted: Thu Jul 04, 2019 11:03 pm    Post subject: Reply with quote

Wonderful pictures, Keith.

I'm hoping you can refresh my memory. What's a quick review of what's known (and not known!) about these unique eyes?

--Rik
Back to top
View user's profile Send private message Visit poster's website
BugEZ



Joined: 26 Mar 2011
Posts: 769
Location: Loves Park Illinois

PostPosted: Fri Jul 05, 2019 3:35 am    Post subject: Reply with quote

Rik asks
Quote:
...what’s known and unknown about these unique eyes?


1. The color we see comes from a layered interference filter on the surface of each ommatidium. This has been imaged on sectioned eyes using electron microscopes in the ‘60s. The spacing between layers tunes the filter, changing the color.

2. Each ommatidium retina has 8 rhabdomes (light sensor’s)arranged in a grid pattern. Looking in from the cornea you can see 7. Rh8 is stacked below Rh7. And Rh7 and Rh8 are in the center position of the array. Rh7 and Rh8 are the color sensing cells, Rh1-6 are light/motion sensing, but not color. There are several types of sensor found in the color positions, each sensitive to a different spectral frequency range, blue, green and UV. The different Rh7-8 sensors scattered at different ommatidium in the compound eye provide color vision. This was studied in the 70’s through early 2000’s.

3. The eyes of lab fruit flies have less spectacular contrast between ommatidium filter colors and the colors are arranged stochastically (random). The color of the cornea filter is matched to the sensor type of the underlying Rh7-8 color sensor cells. Studied in early 2000’s. We humans also have stochastic patterning in our color vision cells.

4. The color sensing cells in doli are matched to the corneal filter. This was determined at NYU around 2013. In striped eye doli where the corneal array has ‘errors’ in the stripe pattern, the sensor cell array has matching errors.

5. Some doli genera have stochastic eye patterns, not all are striped.

6. Some doli genera have quasi-striped eyes. Stripes with so many errors that they nearly look stochastic. In Hawaii Chrysosoma globiferum (accidental from Taiwan) and Condylostylus longicornus (accidental from California) one with striped eyes and one with quasi striped eyes both frolic on the same landscaping and apparently flourish.

7. Some doli have the sensor stripes with little patterning observable in light photos. Tachytrechus vorax, a doli that inhabits sandy beaches near the Great Lakes in the US has no visible stripes but striped sensor cells. A related fly T. angustipennis has weakly visible stripes and striped patterning of the color sensors.

8. The striped eye Dolis inhabit a wide range of ecological nitches. I have watched adults feed along shallow puddles catching tiny worms and larvae. Others hang out on green leaves (like the hosta in my yard) eating aphids and springtails and catching small midges on the wing. They are visual hunters, and acrobatic flyers. They often have elaborate courtship with wing waving and flight displays. They hunt during the day. Some are most active in morning and evening, others during the mid day. They thrive in the tropics and in colder climates like I have in northern Illinois.

The advantage of striped patterning is not clear, but the filters no doubt tune the eyes to provide the contrast needed find mates and meals.

Hope this helps!

Keith
_________________
Aloha
Back to top
View user's profile Send private message
BugEZ



Joined: 26 Mar 2011
Posts: 769
Location: Loves Park Illinois

PostPosted: Fri Jul 05, 2019 3:55 am    Post subject: Reply with quote

A great article...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5263225/

K
Back to top
View user's profile Send private message
rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 19887
Location: Richland, Washington State, USA

PostPosted: Fri Jul 05, 2019 8:04 am    Post subject: Reply with quote

Perfect -- thanks!

--Rik
Back to top
View user's profile Send private message Visit poster's website
sunitapr



Joined: 05 Aug 2019
Posts: 1

PostPosted: Mon Aug 05, 2019 11:43 pm    Post subject: Stereo Image Reply with quote

What a great stereo image. Those perfect unique eyes inspired me a lot to learn more of this field.
Back to top
View user's profile Send private message Visit poster's website
BugEZ



Joined: 26 Mar 2011
Posts: 769
Location: Loves Park Illinois

PostPosted: Tue Aug 06, 2019 3:07 am    Post subject: Reply with quote

sunitapr wrote:
Quote:
These perfect unique eyes inspire me to learn more of this field
.

Glad to be of help on the inspirational side. There certainly is more to learn!

Keith.
_________________
Aloha
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Technical and Studio Photography -- Macro and Close-up All times are GMT - 7 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group