Robber Fly using 300mm f2.8 + 36mm extension tube

I do a lot of close-up photography with my Canon EF 300mm f/2.8L IS USM + 1.4x or 2.0x extender. That’s not the most usual combination for close-up photography, but has several advantages:

1. Long working distance: Due to the long focal length (420mm or 600mm) I can work at a longer distance from your subject than with a macro lens like my Canon EF 100mm F2.8L USM Macro. This is very useful when working with shy insects or when working from a trail and I don’t want to leave the trail when photographing subjects that are a short distance away from the trail (I might want to do this in order not to destroy any flowers that are between me and the subject or because in some national parks and other protected areas it may be forbidden to leave the trail).
2. It’s easier to get a calm background: Due to the narrower angle of view of the long focal length, it’s easier to isolate the subject against a calm background. Distracting subjects in the background (like other flowers, stems of plants or human made subjects) can often ruin an otherwise very good shot. I have written earlier for my reason to choose this combo as compared to a pure macro lens. A longer focal length is helpful when you want a clean and calm background.

Robber Fly using 300mm f2.8 + 36mm extension tube

Here I wanted to compare Canon EF 300mm f/2.8L IS USM and Canon EF 2X II Extender combo against Canon EF 300mm f/2.8L IS USM and 36mm Kenko extension tube. Basically I wanted to know which combination was sharper of the two. I used my Canon EOS 5D mark II for this comparison. All photos were taken using my Benro C45T Carbon Fiber Monopod as support. I fixed the settings as follows to get consistent result. ISO was fixed at ISO 800 & aperture at f/9.5. Shutter speed was 1/250 to 1/350 depending on the light condition as both combos differed optically. As a model I asked a Robber Fly to pose for me on the grass blade . As the Robber Fly just had lunch it was basking on that blade despite lot of insects flying around it. That gave me plenty of time to do my experiment.

First two photos here were taken using Canon EF 300mm f/2.8L IS USM and 36mm Kenko extension tube. This combination gives a fantastically sharp macro. Extension tube does not have any optical element in it. They also lack any electronic circuit in them, so you don’t see their mention in the EXIF information of the photo. By moving the lens father away from the sensor in the camera, the lens is forced to focus much closer than normal. The greater the length of the extension tube, the closer the lens can focus. Thus you can get a magnified view. This allows you to focus the lens closer than the minimal focal distance (MFD) of the lens. Not only do extension tubes reduce minimum focus distance, but maximum focus distance is also reduced. While not welcomed, this is part of the optical change made by the ET. For example, the Canon EF 300mm f/2.8 L IS Lens focuses from 4.5 feet to 10 feet with the Extension Tube. This is closer than 8.2 feet (2.5m) normally my 300mm allows without extension tube. Two drawbacks I find when I attach extension tube are my Infinite focus is lost and my magnification for distant object remains at 300mm focal length.

Second set of two photos here were taken using Canon EF 300mm f/2.8L IS USM and Canon EF 2X II Extender. This combination gives a relatively sharp photo. With Canon EF 2X II Extender Canon EF 300mm f/2.8 L IS Lens becomes a 600mm f/5.6 IS lens. Extenders do not affect the MFD (Minimum Focus Distance) of the lens they are mounted behind, thus the MM (Maximum Magnification) of the lens is also multiplied by 2x. I can stay away from the subject and get almost magnified view nearly double in size. With extender are my Infinite focus is intact and my magnification for distant object doubled to 600mm focal length. If you see the background bokeh it is more creamier with this combo. The optics in the extender cause deterioration of the image sharpness as compared to my earlier combo.

So which combination is better? Even though Canon EF 300mm f/2.8L IS USM and 36mm Kenko extension tube combo is sharper I prefer Canon EF 300mm f/2.8L IS USM with Extender combo for the advantage it has with larger focal length, larger working distance, and smoother bokeh. I also can shoot birds and other distance objects including infinity with higher magnification.

Robber Fly using 300mm f2.8 + Canon EFII 2x Teleconverter

Insects in the Diptera family Asilidae are commonly called Robber flies. The family Asilidae contains about 7,100 described species worldwide. The Robber Flies are air hunters. They also known as an Assassin Fly and Bee Killer. All robber flies have 3 simple eyes (ocelli) in a characteristic depression between their two large compound eyes. The antennae are short, 3-segmented, sometimes with a bristle-like structure called an arista. Their eyes are set wide apart for good depth perception, with even a depression between the eyes to allow full sweeping vision. Also characteristic is the more or less hairy face (the “mystax“), which, it is theorized, protects the eyes during battles with large and dangerous prey. The high arching thorax containing the powerful muscles which activate the wings, allows it to fly up in an instant and snatch fast-flying prey out of the air. Robbers (unlike many similar appearing flies in other families) normally land with their wings folded together over the back of their extended abdomens, and this will help you pick them out. The long spiky muscular legs with which they capture and hold their prey (see especially the falcon-like talons at the ends of their legs).

The short, strong proboscis is used to stab and inject victims with saliva containing neurotoxic and proteolytic enzymes which paralyze and digest the insides; the fly then sucks the liquefied meal through the proboscis. Many species have long, tapering abdomens, sometimes with a sword-like ovipositor. Others are fat-bodied bumblebee mimics. Adult robber flies attack other flies, beetles, butterflies and moths, various bees, ants, dragon and damselflies, Ichneumon wasps, grasshoppers, and some spiders.

Robber Fly using 300mm f2.8 + Canon EFII 2x Teleconverter

Robbers are in the Order Diptera, the true flies, characterized by having two wings (instead of the four wings typical of other orders). Two wings are much more efficient than four wings, and flies are the champion flyers of the insect world. Their hind wings have been reduced to little balancing organs (the halteres), which you can see on this fly as yellow knobs down below the wing bases.

Female robber flies deposit creamy colour eggs on plants or in gaps within soil, bark, or wood. Egg-laying habits are different depend on species and habitat. Most species lay eggs in masses and are covered with protective coating. Robber fly larvae live in the soil or in rotting wood. Larvae are also predators, they feed on eggs, larvae and other soft-bodied insects. They pupate in the soil and move to soil surface emerge as adults.

Micronia aculeata

That night coming home for dinner I spotted this moth on our kitchen floor. Being a pretty common moth around my house I assumed that I will get lot of information about this white moth. It was sitting on the vitrified floor tile which I have used in my kitchen. Dark clay color of the tile was a great contrast to the white, grey moth. Unfortunately the profile picture of the moth was impossible to get as it was sitting as though it was firmly stuck to the tile. That is why you see the picture from one angle here. I used Canon EOS 5D mark II with Canon EF 100mm F2.8L USM Macro lens illuminated with Canon Speedlite 580EXII fitted with ExpoImaging Ray Flash Adapter.

Micronia aculeata

When I searched internet for the information about this moth, I drew blank. Even thoughit is so common we hardly know anything about it. This Micronia aculeata moth belongs to Uraniidae family of moths. Unfortunately I could not find any common name for this moth. Some have called it Wayanad greystripe moth. It is found throughout India, China, Taiwan, SriLanka, Burma; Andaman, Java and Borneo. The adult moths of this species have speckled pale brown wings with two faint darker submarginal bands. Each forewing has a hooked apex, and at the tornus of each hindwing there is a short tail with a black spot.

Micronia aculeata

Like many moths in the family Uraniidae, the moth has its wings open and flat in its resting posture. It is also a day flying moth. Thanks to Haneesh K.M we have Life cycle of Micronia aculeata on Flickr. Host plant for its caterpillar is Green Milkweed Climber Wattakaka volubilis.

Two-Tailed Spider - Hersilia savignyi

Returning after a busy day for a cup of coffee I noticed a spider on the granite pillar which leads to my house. When I built my house I got these local rough granite pillars from granite quarry in the nearby town of Karkala. 16 such tall stone pillars stand supporting roof of my pathway to my house. They are safe heavens for potter wasps who love to build nests. I had several social wasps building small hives before their larvae being eaten by neighboring potter wasps. Being rough it is a nice playing ground for Calotes lizards. That day I spotted a spider which was perfectly camouflaged to the granite background on that pillar. I could spot it only because it was holding a dark dead bee in its mouth and feeding on it. Later I could identify it as Two-Tailed Spider (Hersilia savignyi)

Two-Tailed Spider - Hersilia savignyi

I quickly grabbed my Canon EOS 5D mark II flitted with Canon EF 100mm f/2.8L Macro IS USM. For illumination I used Canon Speedlite 580EX II fitted with ExpoImaging Ray Flash Adapter. For closeup work I use this setup as the Ray Flash Adapter produces nice diffuse light which does not give out harsh highlights. Only drawback I see is that you can see the reflection ring light as white ring on the reflective parts of the subject. After using Rayflash adapter I have nearly stopped using Canon MT-24EX macro twin light flash which I have.I think I need to start using macro twin light flash again with some diffuser so that I can reduce the reflection of ringlight and make the picture look natural. As the spider was stationary feeding on the bee, I had plenty of opportunity to photograph the spider from all the angles.

Two-Tailed Spider - Hersilia savignyi

Being very well camouflaged for life, these spiders have an interesting way of capturing prey. The members of Hersiliidae family are flat, medium sized spiders that have a cryptic appearance and are usually found on tree trunks. These are very fast running, active hunting spiders. The most easily distinguishable feature of Hersiliidae is the extremely long posterior lateral spinnerets, which are often longer than the abdomen and sometimes approaching the total body length, hence the name two- tailed spiders. The body coloring is brown to match the color of the dry bark that the spider is normally resting on and camouflages well. The flattened body allows them to lie very close to the bark without casting any shadow or enables them to hide in the narrowest of cracks.

Two-Tailed Spider - Hersilia savignyi

They are occasionally encountered on walls and rocks. When disturbed, the spider runs very swiftly to the opposite side of the tree with the spinnerets raised like a pair of horns. The spider sits on the tree trunk and spreads the silk over the nearby area. When a small insect comes close, the insect disturbs the silk and the spider senses this. The spider will quickly run around the insect in circles, with the insect in the center. The spider will also lay more silk at the same time, until the insect is entangled in it. They are active hunters living on tree trunks, old walls or under stones and at most spinning a scanty web of irregular threads. A total of six species of three genera are reported from India so far. Next day I saw the same spider with another grasshopper as its victim. I had another photo session with it which you can see in the last two photos on this page.

Two-Tailed Spider - Hersilia savignyi

Hersilia savignyi Lucas 1836, is commonly called Two-tailed spider. Distributed throughout India, Myanmar, Philippines, Sri Lanka. Cephalothorax is flat and almost circular, slightly broader than long, with a prominently high clypeus. Anterior and posterior eyes are strongly recurved, anterior laterals positioned half way between the anterior and posterior medians. Legs, except the third pair, very long and slender and are armed with three claws. Tarsi of legs I, II and III two-segmented. Abdomen is flat, almost circular, slightly broader than long. Posterior lateral spinnerets are very long, much longer than the abdomen. The colour is greyish with a darkish lanceolate cardiac area and dark transverse margins posteriorly. Legs and spinnerets annulated with dark rings.

Two-Tailed Spider - Hersilia savignyi

It lives on tree trunks, often spotted on trunks of coconut palms in a head down position. It feeds on moths, ants and other smaller spiders. Cocoon is generally laid in the crevices of trees. It runs round the tree when disturbed. It is a very common spider in our tree barks and exhibits colour variation according to the substrate on which it is found.