Small Serengeti

Small Serengeti 2, originally uploaded by imarsman.

I love this shot. Wish I'd had the flash up a bit more to get at detail for the ants close into the wood louse, but there's plenty there to tell a good story, nonetheless. The wonderful level of activity and interaction one can find just by looking down as one treads a path is awe inspiring. These Acrobat Ants were gathered around a wood louse, slowly picking it apart until I imagine they'd cooperatively carry it away. The one on top with her back arched is displaying in response to a threatened approach by an ant from another species. Besides lighting, focus was the most challenging aspect of this shot, as limited depth of field forced me to choose carefully what parts of the frame to highlight. I opted for the carapace of the wood louse and as many of the gathered ants as possible.

Frustration and reward

Greetings, originally uploaded by imarsman.

How can I take credit for interesting shots of tiny creatures? All I have to do is walk out my front door, sit down on an overturned bucket, and take a few dozen pictures. A few always turn out well. Ants have caught my attention in a big way for the past few days. I've discovered that there are at least five species in our front yard and driveway alone, something I never would have guessed had I not begun to photograph them. False Honey Ants and Acrobat Ants are the two species that graze on the sweet setae (hairs) that grow from the buds, leaves, and stems of the Bachelor's Button plants in our front garden. The individuals in this photo are False Honey Ants, engaging in a brief moment of contact to ensure they are indeed from the same colony. I have a Nikon D50 camera with a Micro Nikkor 60mm lens. This gives me 1:1 capability. Yesterday, I added in a clip-on Raynox M250 closeup lens, which finally gave me eye detail. The combination of equipment and settings is reasonably simple and leads to good results if one keeps at it. The other factor is an interest in finding good subjects and taking the time to get to know them and take lots and lots of photos of them. This shot was taken with onboard flash diffused through the plastic of a vinegar bottle after 5:00 PM. To compensate for the reduced light I bumped the ISO to 400. I've found that increasing ISO helps with exposure but does lead to slightly increased graininess particularly noticeable on out-of-focus areas.

False Honey Ant clearing food from its jaws

Aaaak!, originally uploaded by imarsman.

Cant' stop photographing these little wonders. Good for both my photographic technique and my soul. Apparently, False Honey Ants eschew weather that's too warm, preferring to come out when it's cooler and lay low when it gets too hot. They have taken over the Bachelor's Buttons in our yard. I still see some Acrobat Ants browsing on the flowers, but seemingly fewer and fewer. False Honey Ants are slightly larger than Acrobat Ants and thus a bit easier to capture photographically. They are also more apt to move about, making it tricky to get shots of them, but more likely that they will be interesting shots like this one. Acrobat Ants tend to spend their time with their heads down, not just down low, but pointing downward to the ground. Much more difficult for a giant like me to photograph.

Regurgitating

Regurgitating, originally uploaded by imarsman.

I need to learn more about what this ant is up to. It seems to be regurgitating its food. At first when I saw False Honey Ants I doing things with their forelimbs I thought that they were preeing. It turns out they were at least some of the time playing with their food.

Artsy

Perspective shift, originally uploaded by imarsman.

I like this shot. Ants don't tend to spend a lot of time near the flower part of the Bachelor's Button plant, so getting a shot of them there takes a bit of patience and a lot of tries. I had the camera angled for this shot, resulting in this sideways view that I decided not to correct. Things I like best about this shot include the purple of the emerging flower petals, the gentle folding of the petals, the black background of most of the shot, and the brown translucence of the False Honey Ant.

Lasius alienus

Ant hill - 4, originally uploaded by imarsman.

This is the ant very common in Ontario which one sees building and maintaining small ant hills in sandy soil. Found out this ant is a member of Lasius alienus. All-in-all I've found five species of ant in our front yard and dirt driveway so far this spring. Amazing what you find if you look.

Formica sp. - pallidefulva group

Browsing, originally uploaded by imarsman.

This ant is found foraging all over our front yard garden and driveway, bringing home dead insects, or getting a meal of nectar, as in this photo. I've submitted it for identification to bugguide.net. When it comes upon Acrobat Ants on a Bachelor's Button plant it is chased away. After this it tends ot run around the plant a bit then go back to where it encountered the Acrobat Ants, only to be chased away again.

False Honey Ants - Prenolepis imparis

Communing, originally uploaded by imarsman.

Here are some False Honey Ants gathering nectar from extrafloral nectaries on a Bachelor's Button plant. Extrafloral nectaries are growths that are rich in sucrose and tend to attract s of ants. It is presumed that extrafloral nectaries serve to protect the plant from unwanted pests, as the ants will chase off other insects. Note that False Honey Ants have large abdomens, an indication that they tend to ingest food that will later be shared with the colony.

Pavement Ant - Tetramorium caespitum

Forager, originally uploaded by imarsman.

Here's a Pavement Ant, not terribly poetically named. Its abdomen is much smaller than that of the Acrobat Ant, probably because it brings home scavenged food rather than ingested nectar. This one was "scavenging" another Pavement Ant that wasn't dead yet and vigorously resisted being carried along.

Acrobat Ant - Crematogaster sp.

Grazing, originally uploaded by imarsman.

I found out that this is an Acrobat Ant. I imagine its propensity for stooping down to eat made those who named it think of an acrobat. It has a rather large abdomen, presumably for holding food, and a spiny protrusion dorsolaterally on each side of its thorax.

Small things and the limits of cameral equipment

Red ant 3, originally uploaded by imarsman.

Here's a photos of a small ant I took today. It turned out quite well, much better than with my previous non-SLR camera, but it points to a few things I'll be working on with my macro photography.

One of these macro issues I've just found out about is diffaction effects at small aperture settings. Here's a great article on the subject. Wikipedia has a nice article on part of the theory behind the issue. Essentially, the smaller the aperture allowing light to pass from the lens to the sensor or film, the more likely individual waves of light are to overlap with each other, creating fuzziness in the image. Other variables involved include the size of the sensor, the size of the individual sensor receptors, and the focal distance. Of course, the quality of the lens passing light to the sensor is an important factor as well. People say that one should be able to take good photos no matter what equipment one is using. This is true to a certain extent, of course. I am very happy with many photos taken with my previous non-SLR camera. However, smaller sensor size, smaller aperture, less sharp optics, and the inability to use flash made getting a sharp picture more difficult. The page I linked to above has a nice calculator that lets you figure out how small you can set your camera's aperture before diffaction effects manifest themselves. My camera at macro focal distance apparently can be set up to f14 or f16.

Availability of light is another issue with any photography. For my macro photographs when not in bright sunlight I've started to use my on-camera flash with a homemade diffuser at the end of the lens cut from a vinegar bottle. Unfortunately, with flash, the camera seems to want to set shutter speed to 1/60 second. At this speed motion blur can be an issue. I will try experimenting with setting ISO level to 400 or 800, seeing what using a wider aperture does, and when I am confident enough, setting shutter speed manually as well.

Another always-present issue with macro photography is the very shallow depth of focus one must deal with, also known as depth-of-field. Another nice page on the diffraction effects site (cambridgecolour.com) deals with depth-of-field. A nice calculator is included on this page as well that allows depth-of-field for varying focal lengths, subject distances, apertures, and camera sensor sizes to be estimated. At f16 I should get about a 5mm depth-of-field. At f14 I should get about 4.5mm. This means that taking a photo head-on of a 7mm ant at most 4 to 5 mm of the subject will be in sharp focus. Focusing at such close distances is tricky, so one often gets a situation where sharp focus begins a bit in front of the subject, so one might only get 2 or 3 mm of sharp focus. This explains why one sees lots of side-shots or top-shots of macro subjects. The area of interest all falls within the depth-of-field focal range for these shots.

Descending

Descending, originally uploaded by imarsman.

Here's an ant going down the other side of an obstacle. Amazing ability to traverse terrain. Looking at this one, you can see that ants are well designed for strength. It's body is rigid and its legs provide great leverage. Just amazing.

Alone

Alone, originally uploaded by imarsman.

One of my best insect photos. This ant was pausing at the crest of a plant branch before beginning her descent. Standing at the crest of a hill and looking over the horizon is something that people can identify with. The sky was overcast when shooting this photo, so glare is reduced, both on the ant and the succulent plant that in sunlight produces lots of points of glare.

Investigating

Investigating, originally uploaded by imarsman.

Here's one of my recent ant pictures, taken with the new Nikon D50, and just as importantly, a 60mm Micro Nikkor AF lens. I'm sure I will take many more photos, some of which will be better, but I like the action in this one. These ants were congregating around a wilted flower and dead midge. The midge was eventually carried away. All of my ant shots so far, except those taken on a cloudy day, have driven home how useful a polarizing filter would be in reducing glare. So, I ordered one today, a B+W 62mm polarizer. It's a good one, made in Germany. Within limits, my philosophy is to purchase good quality things, spending a bit more to get something that will be more useful in the long run. I applied this philosophy to my polarizer puchase, paying $50 instead of $25 for a multicoated polarizer with brass ring mount rather than an uncoated one with an aluminum mount.