Showing posts with label video. Show all posts
Showing posts with label video. Show all posts
Top 11 must watch videos on TED
Top 11 must watch videos on TED
Here is the list of 11 great lectures I watched recently on TED and thought sharing with you. Of course there are many more yet to be watched. I will share best of them too! Right now these 'oceans 11' for you - the title of individual is self explanatory.
Lime Blue (Chilades laius)
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| Fresh Lime Blue |
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| Lime Blue female egg laying on Lime |
Lime Blue (Chilades laius) belongs to Lycaenidae family. It is small butterfly, grayish in color. We
were able to observe its life-cycle. As its name suggest its larval
host plants includes Lime plants. We observed its larva on small lime
tree in Medical garden. Larva was easy to detect even though it is well
camouflaged. Ants constantly follow larva, so in order to find Lime
Blue's larva just follow the trail of ants. On the same plant we were
able to find many empty pupa. This plant had many curled leaves. Lime
blue caterpillar took advantage of this to make the pupa. Pupa were well
concealed inside curled leaves of plant. It seemed that ants
were attaining pupa also. We saw two pupa made very near to each other
on same curled leaf. Lime Blue is seemed to be common in immediate post mansoon months. Again they were mainly encountered around Hill side.
Key
to ID this butterfly is the "L"shaped dots on its hind wings. Sex are
dissimilar, female has black outlines on UP, which are absent in male. Here is a video Describing association of ants with lime blue caterpillar on lime tree.
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| Lime Blue pupa in secluded leaf of lime, held on palm |
Quick Facts:
Common Name: Lime Blue
Scientific Name: Chilades laius
Wingspan: approx 25-20 mm
Status: Locally Common.
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Wandering destination: Tungareshwar WLS
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| Cool water streams at Tungar WLS |
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| Plum Judy is a commoner butterfly |
To reach Tungar, take bus from Main gate to Andheri railway station. Frequent locals from Andheri drops u at Vasai road. Take share auto to "Tungar Phata" and then start walking towards WLS. Entrance is at about kilometer inside from the main road. No ticket is charged presently and no permission required for nature walk. One can either follow the water streams or the road. Another part of Tungar WLS is Chinchoti waterfall. Alight at Naygaon station, catch share auto to reach Chicnhoti fata.
Tungareshwar is famous for the Shiva Temple, which is around 3-4 kilometers from Tungar phata. Fairly good road for vehicles to go till the temple. It is jot advisable to take bikes, specially in and after monsoon season.
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| Cornellion is common in Monsoon |
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| Morning at Tungar WLS |
Video of Water stream, Chinchoti during December
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| Shiva Temple |
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Tungar WLS and Chichoti waterfall
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Why to have Vibration reduction / Image stabilization for camera ?
Its a technique used by Nikkor lenses to stabilize the gear while shooting. Other companies use different name, however basics are the same eg. canon uses Image Stabilization (IS), optical stabilization by Sigma etc. Its useful when shooting at low shutter speeds particularly at longer focal length or when one has shaking hands or if one is shooting from moving platform like vehicle. It can be also helpful in taking video.
For any image to be sharp, the shutter speed (1/s) must be more than or equal to operating focal length. Ideally the ratio should be 2. When shooting speed is lower, one can still get sharper images without compromise in quality (wrt noise) with increased ISO.
I have shot a video showcasing the effect of VR. I used Nikon D7000 with Nikkor 105 macro IF-ED VR lens for the purpose, a prominent accessory for macro photography . Ofcourse its hand-held, VR - It doesent works when mounted on tripod anyways (unless its VRII). Initially it starts with VR OFF, at 00.10 seconds VR is turned ON. After switching VR ON, see how the jerks and shakes from the video are all gone, showing smooth streaming.
Here are some links to the articles explaining the VR technique:
1. From Nikon
2. General info from Wiki
3. interesting graphical interpretation
Common Jezebel (Delias eucharis)
Place : IIT Bombay
The Common Jezebel (Delias eucharis) is a medium sized pieried butterfly, found in many areas of south and South east Asia, especially in the non-arid regions of India Mynamar Sri Lanka and Thiland. The Common Jezebel is one of the most common species in the genus Delias. The wingspan of both males and females range from 6.5 to 8.5 cm.
Upperside is white. The forewings have the veins broadly black, this colour broadened triangularly at the termination of the veins, costal margin narrowly black; a broad black postdiscal transverse band from costa to dorsum sloped obliquely outwards from costa to vein 4, thence parallel to termen. Hind wing with the veins similar but for three-fourths of their length much more narrowly black; a postdiscal transverse black band as on the forewing but much narrower, curved and extended only between veins 2 and 6; beyond this the veins are more broadly black and this colour as on the forewing broadens out triangularly at the termination of the veins; the interspaces beyond the postdiscal black band pink, due to the vermilion coloration of the underside showing through.
On the underside, the forewings are similar but the black edging to the veins much broader, the upper two interspaces beyond the postdiscal transverse band tinged with yellow. Hind wing: ground colour bright yellow, the veins and transverse postdiscal band as on the upperside but much more broadly black, the latter extended from the costa to vein 2; the interspaces between the veins beyond the postdiscal fascia with a series of broadly lanceolate or cone-shaped vermilion-red spots, each spot very narrowly edged with white; the basal portion of interspace 6 white, in contrast to the bright yellow of the ground-colour. Antenna black; head, thorax and abdomen white, the apical joint of the palpi black; the head and thorax with a mixture of black hairs that give these parts a grey-blue appearance
Compiled By Paresh Kale
Ref: Wikipedia
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