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Hanging on Lunch

 
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Dalantech



Joined: 03 Aug 2008
Posts: 368

PostPosted: Thu Apr 23, 2009 12:11 am    Post subject: Hanging on Lunch Reply with quote

Solitary Bee actively feeding -gave me all of three frames.

Tech specs: Canon 40D (F13, 1/250, ISO 100) + a Canon MPE-65mm macro lens (@1x) + a diffused MT-24EX macro twin flash (-2/3 FEC).

Link to a larger version -just click on the link to expand it. I also blogged about this, and a few other photos, in a post called Difficulty and Deception.


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Last edited by Dalantech on Thu Apr 23, 2009 5:00 am; edited 1 time in total
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augusthouse



Joined: 16 Sep 2006
Posts: 1195
Location: New South Wales Australia

PostPosted: Thu Apr 23, 2009 2:39 am    Post subject: Reply with quote

John,

Fascinating series of images.

You've outlined the technique for this series on your blog; but for the benefit of viewers who don't happen to click through; could you briefly summarise the use of the flash as your shutter aspect?

Craig
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Dalantech



Joined: 03 Aug 2008
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PostPosted: Thu Apr 23, 2009 4:31 am    Post subject: Reply with quote

augusthouse wrote:

You've outlined the technique for this series on your blog; but for the benefit of viewers who don't happen to click through; could you briefly summarise the use of the flash as your shutter aspect?

Craig


Excellent question Craig!

Kinda tough to sum it up in just a few words though.

At life size magnification, F11, ISO 100, and 1/250 of a second for the shutter there is very little natural light getting though the lens and onto the image plane (the sensor in the camera). If the flash does not fire, then the resulting image is going to be almost completely black -only the most reflective objects in the scene are going to get recorded (barely). At higher magnifications the image will be totally black if the flash doesn't fire.

Since the flash is the only significant light source being recorded by the camera it becomes a "virtual shutter" and the short duration of that light can be used to freeze motion. We've all seen images of a balloon in mid pop, frozen in time by a short burst of light from a flash (if you haven't then look here). The same principles that apply to high speed stop motion photography, freezing motion with a flash, apply to macro -IMHO macro is just one form of stop motion photography.

In my experience the shorter the duration of the flash the sharper a macro image will be. So getting the flash close to the subject, and using a good diffuser (one that actually diffuses the light and not just block it) is key to getting high quality macro photos.

If you'd like, in another thread, we can get into the difference between diffraction and what I call "macro motion blur" induced by a flash duration that's too long to freeze the motion in a scene.
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augusthouse



Joined: 16 Sep 2006
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PostPosted: Thu Apr 23, 2009 5:33 am    Post subject: Reply with quote

Dalantech wrote:
Quote:
If you'd like, in another thread, we can get into the difference between diffraction and what I call "macro motion blur" induced by a flash duration that's too long to freeze the motion in a scene.


Yes Please!

Craig
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gpmatthews



Joined: 03 Aug 2006
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Location: Horsham, W. Sussex, UK

PostPosted: Thu Apr 23, 2009 6:19 am    Post subject: Reply with quote

Quote:
Since the flash is the only significant light source being recorded by the camera it becomes a "virtual shutter" and the short duration of that light can be used to freeze motion.


This is pretty much how flash photomicrography works - I use continuous illumination that is adequate for manual viewing, but will produce a black field at the camera settings used with flash, if the flash is not fired. Hence the flash duration governs the exposure time.
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Dalantech



Joined: 03 Aug 2008
Posts: 368

PostPosted: Thu Apr 23, 2009 12:23 pm    Post subject: Reply with quote

Will do Craig -what forum do you want it in?
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rjlittlefield
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA

PostPosted: Thu Apr 23, 2009 2:44 pm    Post subject: Reply with quote

Dalantech wrote:
Will do Craig -what forum do you want it in?

Macro and Micro Technique and Technical Discussions

--Rik
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Dalantech



Joined: 03 Aug 2008
Posts: 368

PostPosted: Fri Apr 24, 2009 2:12 am    Post subject: Reply with quote

rjlittlefield wrote:

Macro and Micro Technique and Technical Discussions

--Rik


Done Smile
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