Macrolens reveals details of the eye of a fly invisible to the naked eye (Bosrandroofvlieg)

The Sony 90mm macro-lens reveals details invisible to the naked eye. I was lucky to discover the fly 'Bosrandroofvlieg' Neoitamus cyanurus sitting on a wooden fence. It's a predatory insect which preys on flying insects. A strategy similar to dragonflies. The animal kept returning to the same spot on the fence after short flights. Luckily, it wasn't too afraid of my camera. I could come rather close to it. It cooperated just enough to take high quality pictures. 

Bosrandroofvlieg; Common Awl Robberfly; Neoitamus cyanurus
image 3x scaled down (but blogger will resize it again)

 

Luckily it was not sitting on a leave. The notorious disadvantage of leaves is that they nearly always move even when there is hardly any wind. That's a big annoyance for macro-photographers.

The quality of the original was good enough to show the individual lenses of the compound eye:

same picture (original 600x600 pixels)

enlarged detail of the above picture

These are really big eyes! Most part of the head consists of eyes. By the way: a surprising effect appears when step wise reducing the display size of the picture on a computer screen:

example screen capture (enlarged)

 

example screen capture (enlarged)

These patterns appear dynamically depending on the zoom factor. It's really fun to experiment with it. Because the effect is dynamical, the patterns could disappear when blogger displays them. So, I made screen-shots of two different zoom factors in the image viewer (above). To see the dynamical aspect I made this video:

 video produced by SimpleScreenReader 0.3.6

You have to watch the video in full screen mode.

A requirement for the effect is that the original picture of the eye of the fly is in focus. When even slightly out of focus the effect disappears. I was fascinated by the effect and wondered whether I could reproduce it with any artificial design on my computer. So, I created this mega chessboard:

chessboard 800x800 pixels, 160x160 squares

To see the full effect, you can download the chessboard from my website and view it in your image viewer. Watch different zoom settings in your image viewer. Amazing patterns are produced. They seem to appear out of nothing. The specific patterns and the order in which they appear seem to be unpredictable.

screen capture 1

screen capture 2

Do you see them too? By the way: a completely different effect appears when slowly scrolling up or down in the browser (especially # 1). This depends on how fast your screen is updated.

So, yes, one can reproduce the dynamical patterns of the eye of the fly with an artificial chessboard. Let me know below what is our experience?

Sorry, I got distracted by these strange phenomena. They have nothing to do with the Sony lens or camera. Or my computer. Or my screen. Or my eyes. My guess is that the algorithm of the image viewer that shrinks an image systematically deletes a number of pixels. That is the only way to shrink a picture without distorting it. The artificial dynamical patterns are a side effect of this algorithm. Not intended. Not created for a purpose. In evolution side effects appear too. Sorry, again for the distraction. In a next blog post I will focus on the insect world as revealed by the macro lens.

Details:

Camera: Sony α6400

Lens: Sony FE 90mm f/2.8 Macro G OSS

Aperture value: f/8.0. 

Exposure time: 1/125 sec

ISO speed rating: 3200

Focus: autofocus

Image stabilisation: ON (but the lens was also stabilised because it rested on the fence)  

Rare interview with evolutionary biologist John Maynard Smith on youtube

Richard Dawkins interviews John Maynard Smith 

By accident I found an interview with evolutionary biologist John Maynard Smith (1920-2004) on youtube. I read his books, but I have never seen an interview with him. The short fragment I watched appeared to be part of a big interview split in 102 fragments of 1-4 minutes each. 

The interview was published on youtube in 2017. That is 13 years after his death. He must have been in his eighties. If you search for John Maynard Smith in youtube, you get fragments of the interview in random order. Very unsatisfactory. The only way to get all of them and in the right order is to start at the playlist of the 'Web of Stories - Life Stories of Remarkable People'. The interviewer is not visible and WoS forgot to tell us who he is. However, I recognized the voice of Richard Dawkins, famous popularizer of the idea of the selfish gene, Darwin and evolution. 

I did not notice it at first, but the video fragments have a transcript hidden behind SHOW MORE. The text tells us also that the 'listener' is Richard Dawkins and that the interview was recorded in 1997. John Maynard Smith was then 77. His memory is good!

Maynard Smith's whole life and work is covered. And that includes everything that happened in evolutionary biology after the war. Noticeable are his discussion of J.B.S. Haldane, Tinbergen and Lorenz, Bill Hamilton, E. O. Wilson, James Watson and Francis Crick, Kimura, Charles Darwin and Karl Popper. In short: every person with a significant contribution to the field of evolution. Indeed, all the famous names. If those names don't mean anything to you, have a quick look at the wikipedia pages.

I read many of his books. I was deeply impressed by The Origins of Life: From the Birth of Life to the Origin of Language (written with evolutionary biologist Eörs Szathmáry). It's a goldmine. I read it several times and consult it whenever I seek clarity on specific topics in evolutionary biology. It is a masterpiece. Concise writing. Using the fewest words possible to convey an idea clearly. I recommend the book to biologists and non-biologists as the best introduction to the theory of evolution. No time is wasted to refute creationists. No time is wasted on irrelevant facts. I have a page on my WDW website devoted to his books.

John Maynard Smith started as an aeroplane designer and switched to biology. He became an excellent theoretical biologist. He never did lab-work. He wasn't trained for that kind of work. He could be called an orthodox Darwinist. Not because he blindly followed Darwin, but because he developed the theory of evolution with the tools of mathematics (game theory). He had zero-tolerance for any form of nonsense. He was not afraid to tackle the biggest problems in evolution. His teacher was the famous J.B.S. Haldane.

There is another interview with John Maynard Smith a year before his death: Robert Wright & John Maynard Smith (2003) 56 min 32 sec. It discusses philosophical and religious questions.

Postscript

Contrary to what I wrote above, John Maynard Smith did experimental work on Drosophila on the topics of sexual selection and ageing (he tells us in part 29/102). Elsewhere in the interview he tells that he wasn't good at biochemistry, and that's why he collaborated with Eörs Szathmáry. [7 Jul 2021]

 

How to get rid of ads 

When watching videos on you youtube the video is always interrupted by ads. Here is how to skip those annoying ads. When you are watching videos of a Playlist, and an ad appears, click on the Back button (left bottom corner) shown in the picture, and then click immediately the forward (Next) button. The system is confused and forgets it should play an add. However, when a second ad starts, repeat it. So, by only two (or four) clicks you can skip the ads and watch your video. [added 11 Jul 2021]

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