Archive for the 'Photography' Category

Is there something in my teeth?

Today, I took my first shot at fo-macro photography using a 50mm reverse-mounted lens. I think I had a little success despite obvious issues with the built in flash. I like this shot of a damselfly, Argia apicalis (Zygoptera), munching on some sort of bug.


Munch Munch Sluuuurp


Gonodactylus chiragra (Gonodactyloidea)

In contrast to the pretty and placid G. playtsoma, today I have a photo and video of one of the meanest mantis shrimps I have encountered. Gonodactylus chiragra occurs in the same intertidal reef flats as G. playtsoma, but its temperament is the polar opposite. It hits hard and often.

You lookin' at me?

Its coloration is a mottled brownish-yellow-green on creme; except for bright orange and yellow accents on the antennae, mouthparts, and walking legs.

Here is a quick video of G. chiragra, whalloping the wall of its aquarium; attempting to hammer my finger (off-screen). It plays at regular speed and then at one-tenth speed (the slow-mo is much more impressive and/or comical, in my opinion).

If you want to know more about the astounding stomatopod strike, check out my previous article: Why Stomatopods are Awesome, I: Super Strength.

This was my first attempt at editing together a video, and I will hopefully have more content like this in the future.

Gonodactylus platysoma (Gonodactyloidea)

Gonodactylus platysoma

I first saw this species of stomatopod in the field this year. They are really beautiful animals, with subtle but vibrant color accents on their dactyls, antennae, eyes, and on the edges of some of their somites (body segments). This individual is about 72 mm in length, and the species seems to be fairly docile (for stomatopods).

This animal also has very beautiful fluorescent patterns on its body:

G. platysoma; UV-excited fluorescence.

I talked previously about fluorescence in stomatopods here. However, I don’t know if the patterns on G. platysoma are used to amplify any particular signals. These animals live in shallow water and would have less use for fluorescent signal amplification.

Some cool panoramas from Lizard Island

I had a little fun with Photoshop, stitching together some photos that I took at Lizard island. I didn’t originally intend to turn these photos into panoramas, but I’m fairly pleased with the results. Once again, Photoshop is witchcraft.

The lizard Island Group lagoon, taken from the lizard neck peninsula of lizard Island. From left to right: Bird Islet, South Island, and Palfrey Island protect the lagoon.

This is the view back at Watsons Bay from the start of the ridge leading up to Cook's Look (visible in the last photo). Watsons Bay is adjacent to the ludicrously expensive resort. It is an Australian National Park area and provides a place to anchor for pleasure yachties.

A higher altitude view of Watsons Bay from the Cook's Look ridge path. South and Palfrey Islands are coming into view in the background.

Watsons Bay and Cook's Look hill, taken from an outcrop near the resort. The Cook's Look trail starts at the beach of Watsons Bay, climbs to the left to mount the ridge, and then continues along the ridge to the summit. The 395 meter hill is so named because Captain James Cook climbed it in order to plot a course out of the maze of reefs in the area in 1770.

Ultraviolet garden

Following my first proof-of concept attempt at UV photography yesterday, I went out around campus again today with a tripod and remote. I got some much better shots of flowers and the campus. This time I’ve left the photos exactly as they came off the camera. Near violet UV records in the blue channel, and deeper UV in the red channel (For reference the dandelion outer ring has a reflectance peak around 350 nm, recorded here in the red channel).

A newly opening dandelion with the strong UV ring.

A white clover flower.

Unknown white flowers with little UV. Anyone know what they are?

Buttercups also have a strong UV pattern.

Ultraviolet campus

First attempt at UV photography

Here is my very first attempt at ultraviolet photography. The was taken with a Nikon D1H with a UV Nikkor 105 lens and filter glass for blocking visible and infrared light (400 nm and up). I took this with a half second exposure and no tripod and remote, so it is a bit blurry. The dandelion, like many flowers, has a distinct UV ring pattern that is visible to many insect pollinators. Here, reflected UV light is false colored white.

My first UV photo of a dandelion.

I really wish I had gotten a more stable shot since there is also an ant visiting the center of the flower.

Adobe Photoshop CS5: Now with witchcraft!

The new version of the indispensable Photoshop image editor came out a couple days ago, and includes an unbelievable feature called Content Aware Fill. According to Adobe:

We have developed interactive image editing tools using a new randomized algorithm for quickly finding approximate nearest neighbor matches between image patches.

Essentially it removes unwanted items from an image instantly and seamlessly. Alterations that used to take a skilled Photoshop user hours to preform are completed in seconds with almost no competence required. Watch these videos; and if image editing is a time consuming part of your work, prepare to pick your jaw up off the floor.

This one starts off with minor tweaks, like removing lens flare and bits of trash from a scene, but skip to the middle or so to see the ridiculously awesome stuff.

This video shows how great this is for easily toughing up images.

There is a better explanation of how Content Aware Fill works, here. I prefer to think it uses witchcraft or is the rudimentary self-aware beginnings of Skynet. Run for it, Sarah Connor.

I have moved.
Arthropoda can now be found here.

Michael Bok is a graduate student studying the visual system of mantis shrimp.

Flickr Photos