Digging Deep

Day-3/ 1^st half:

Today I entered the class at 9:40 am. All of us reached on time today. One fellow among all of us didn’t/ couldn’t do the assignment of writing the blog. Assuming he couldn’t do it before coming to class, he didn’t make an attempt to complete it even after reaching the class was surprising. He reached there between 9:45 to 10 am. Sir arrived around 10:30am. In that half an hour I didn’t see him making any effort to finish the assignment. On the contrary I or we (the class) also didn’t make him understand the importance of finishing the assignment on time even after knowing the basic rules. Also many of us have not read the blogs posted by other classmates before coming to the class which was again a part of the rules. In that half an hour we could have read the blogs instead of just waiting for sir to arrive. We realised about it when we discussed this about sir the next day. While the incident didn’t get over there only. The whole matter of not doing the assignment on time and being questioned on that by sir got to a different level.

Part-1: Truth and dare

He took it in a different way. His point was that he couldn’t do it because he had other works regarding the dialogue shoot. Also what all of us felt and as he himself mentioned before the class begun that he didn’t do it in because he just doesn’t want to follow the instructions given by sir just like a school kid back in the school days. The matter got heated when he kept defending his point for not doing the assignment with sir. In that course two other people joined him in support or to put across their differences. Those two of them were Sreecheta and Mainak. Among the list of Sreecheta’s grievances first one was she was looking forward to the class today because she couldn’t get one of the points  discussed day before which was “why the human eye is not able to magnify when it has a variable focal length?’. The point she wanted to put across is that everyday we are wasting time on either someone being late for the class and class getting dismissed which happened on the first day because of me being late, then the second day the class again didn’t get start because one of the person i.e Jubraj who didn’t finish the assignment, and the other Hari, who had done it but not on blog as everyone is supposed to do instead he did it on PPT. So she felt that instead of concentrating on class and the learning part we are wasting time on silly matters. But as we all have been briefed on the first day that there would be no class without these ground rules being followed by each and everyone of the group. Then came the argument was ‘ we are all grown up so whenever one makes a choice of not coming to class, or not doing the assignment, or whatever is there decision, why should it be compulsion and why others have to suffer for that! But the agenda which Sir was trying to put across from the beginning that ‘we function as a TEAM or an organism which moves together as a unit’.

Mainak also had a similar  argument that how much time are we gonna waste on making others undertand and follow the rules everyday. He came up with a new term “ANARCHY”

during the argument with sir which I personally feel is not applicable in this situation as anarchy is completely opposite of  the situation we are in.

PART-2: Raising the Hand

There came a point when Tanmay raised his hand. No this is not that “raising hand” it’s a simple gesture where he puts his hand up in the air and the opponent has to stop talking. This again was pointed out by JJ, Mainak and sreecheta that it’s againt the freedom of expression and a free will of an individual.  Tanmay’s point is that we got to respect him if we expect respect from him so whenever the water crosses the level, he will raise his hand.

PART-3 : The Realisation

Later in the second half JJ didn’t arrive in the class. We waited for him sometime then atrted discussing the problems goin on with Sir. Hari broke the news that he will be leaving the next day for Chennai for his house warming event. Which again breaks the rule of moving forward as a unit. So everyone tried to make him understand that it would be good if he stays back because we all felt he will be missing on the workshop and even when he comes back after some days it will be hard for him to catch up with us and it will difficult for him as well as us to operate with him during the shoot when he would have already been missed out on many things. By the end of the day Hari remains stick with his decision which he leaves for Chennai the next day. So the whole class came to a consensus that he can come back and join us as an observer during the shoot. Good news was JJ came back in the end and realised his mistake. Sreecheta also somehow realised the point which Tanmay was trying to put acroos and yes her question was being answered too.

Today we experimented with the pin hole camera during the day time and in a dark room with bulb as a source of light.

PIN HOLE CAMERA:

1) How the pin hole camera functions?

-A pinhole camera is a simple camera without a lens and with a single small aperture. We made a cylindrical shaped pin hole camera. It has  a small hole in one end of the cylinder. Light from a scene passes through this single point and projects an inverted image on the opposite end of the cylinder.

single pin hole camera

1/50, F2.8, ISO 1600

inverted image of the filament

1/20, F5.6, ISO 1000

200 watts bulb as a source of light in a dark room.

1/20, F22, ISO1600

2) What if we change the reading distance of the view finder and the sensor of the pinhole camera? 

if we increase the reading distance then the image becomes sharper and if we go close to the sensor or decrease the reading then the image becomes blurred.

3) What if we remove the view finder?
  -if we remove the view finder the image becomes less brighter because of the presence   of ambient light which was first blocked by the view finder.

                                    1/80,F5.6, ISO2000

4) Why could we only see the Sun during day time and only the bulb(dark room) in the night time through the pin hole camera?

-That’s because the sun and the bulb is the brightest source of light in their respective surrounding and also it depends on the sensitivity of our eye. Our eyes are sensitive to the intensity of light that the sun and the bulb has.

     Image of the bulb filament through the pin hole camera.

     1/30, F5.6, ISO1600

    image of Filament is only formed on the sensor not the person standing behind.

    F5.6, 1/20, ISO 1OOO 

5)Why the image on the sensor moves in the same direction with the movement of the  Pin hole camera?
- the image is laterally inverted.

6) Image formation with two Pin holes.

F5.6, 1/20, ISO 1600

                                                               F5.6, 1/13, ISO 800

 7) What if we make the hole bigger in the pin hole camera?
    -Increasing the aperture+ decreasing the focal length =more brighter and  less       sharper image.

                                F4.5, 1/60, ISO 6400

    8) What happens when you make multiple holes?

 

    Multiple holes in the pin hole camera
    1/30, F5.6, ISO800

     Multiple images are formed depending on the number of holes you make.                      These images are blurry and overlap each other.

    1/30, F5.6, ISO800

9) how does the diameter of the sensor of the tube effects the image?

                                           F4.5, 1/60, 1600 - Bigger diameter

                                          F4.5, 1/60, 1600- smaller diameter

-So bigger the diameter, larger the image and smaller the sensor smaller the image or the image gets cropped out also if you keep the distance same with respect to the other tube with the bigger diameter. 

Note- Both the tubes have similar distance between the hole and the sensor i.e same focal length.

10 Macro lens:

without macro lens-f3.5, 1/30, ISO 3200

macro lens (magnifying glass) -f3.5, 1/30, ISO 3200

                                          1/30, F8, ISO-100, 
Image of a single pin hole camera clicked on Nikon D3000 with a magnifying glass in front of it.

Digging Deep- II

#Day 2

Morning session:

The objective was to make everyone understand that team work can’t progress without the complete participation of all the team members. At the same time each team member should be responsible enough for themselves as well as others.

Post lunch:

·        1} Considering that the human eye has variable focal length, still how can they not zoom in/out ?

There are three basic parts of the eye: a light focusing system, an automatic aperture system, and a light sensitive detection system. In the light focusing system, the cornea and the lens account for the refractive power of the eye. Most of this power is due to the curvature of the cornea, but the muscles controlling the curvature of the lens provide the flexible focusing power of the eye. These eye, or ciliary, muscles permit the normal eye to focus on the retina light from objects very distant, essentially parallel rays of light, as well as light from objects as close as the normal near point of 25 cm from the eye.

The distance from the eye to the page at the nearest point of clear vision is the near-point vision. One has greater eye accommodation than normal if his near-point distance is less than 25 cm. The power of a lens is a measure of its ability to bend rays of light. A lens of high power has a small focal length.The human eye has a variable focal length so the eye can change its power to focus on objects at various distances from the eye.

Hence the power of the eye changes accordingly to accommodate objects at various distances from the eye.

·        2}.How can you focus after an eye surgery?

Refractive lens exchange, also called lens replacement surgery or clear lens extraction, may be a better option than LASIK, PRK or phakic IOLrefractive surgery for people with presbyopia and high hyperopia (farsightedness).

Refractive lens exchange (RLE) replaces your eye's clear natural lens with an artificial intraocular lens (IOL) to correct your refractive errorand achieve sharper focus, reducing your need forreading glasses or bifocals.

The procedure for refractive lens exchange is virtually identical to cataract surgery . The difference is that in RLE, the lens being replaced is clear, rather than a cloudy lens due to a cataract.

As in cataract surgery, three types of IOLs are available to replace your natural lens, depending on your vision needs and the health of your eyes. They are:

·         Monofocal fixed-focus IOLs. monofocal lenses provide clear vision at distance, intermediate or near ranges — but not all three at once.

·         Multifocal IOLs. A multifocal lens provides clear vision at multiple distances.

·         Accommodating IOLs. An accommodating IOL is a type of monofocal lens that enables focus at multiple distances by shifting its position in the eye.

With intraocular lenses, there is no "one size fits all," and your eye surgeon will recommend an IOL that is most suitable for your individual needs.

Each IOL has advantages and disadvantages in terms of the best uncorrected vision it produces at near, intermediate and far distances, as well as the likelihood and degree of vision disturbances such as halos and night glare that might occur after surgery.

Also, the results of one clinical trial are not directly comparable with those of another, as each study is conducted in a different way, often with differing endpoints and patient-enrollment criteria. Your eye surgeon will advise on the most suitable IOL for you.

Though I would still like to have a better and clear idea about the questions raised by Tanmay sir.As all these are way too scientific. It would be helpful if he can make me understand in simpler words.

Digging Deep

#Day 1:

SRFTI/ /(bright sunny)morning :D

This day is like any other usual days in the campus except that it marked the very beginning of “Lighting and Lensing Workshop with Tanmay Agarwal”.

The class started with few basic ground rules which Tanmay sir set for us, such as everybody has to be on time, all the phones have to be switched off during the class hours and have to be kept on the table. If anyone of us fails to follow any of these rules that would mean facing certain punitive measures.   

The class started with the very basic question which is ‘What is the first thing we look for when we see a picture?’ after he threw this question to us we all were thinking to come with an accurate answer. Breaking the silence he asked again do we look for the lens, ISO, magnification, aspect ratio and all that technical terms ? no, only good pictures captures our attention. Hence on basis of what I got as what he meant is:

#RULE1- Click what attracts you.

#RULE2- Never click a picture to impress, click to express just as writing or any other creative work.

Post lunch:

We were asked to click a ‘GOOD’ picture of  any of the bridges in our campus. Everybody set out to look for their ‘Good’ picture of ‘The Bridge’.

So we began our exercise of the day which I would like to call as ‘On, Under, By, Around the Bridge’.

Meanwhile Tanmay sir managed to click a picture of few of us clicking the pictures which he showed us later in the class.  I should have taken that picture from him:p 

After ten fifteen minutes we went back to the class with whatever pictures we clicked. 

These were my pictures which are my ways of looking at the bridges of our campus. 

Few of them were liked and few were disliked by my classmates. The exercise taught me of having your own perspective of looking at things and how your perspective can be beautiful to some and not to some. Still having a perspective of your own and expressing what you want to through a photograph is the job of a photographer.

Before ending the class he popped a question 'does human eye have variable focal length (zoom lens)?'

To answer that I goggled few things about the human eye and I got to know the basic structure and functioning of human eye.

Instead of film, the human eye focuses light onto a light sensitive membrane called the retina.

The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light. Behind the cornea is a colored ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract depending on the amount of light entering the eye.

Situated behind the pupil is a colourless, transparent structure called the crystalline lens. Ciliary muscles surround the lens. The muscles hold the lens in place but they also play an important role in vision.

When the muscles relax, they pull on and flatten the lens, allowing the eye to see objects that are far away. To see closer objects clearly, the ciliary muscle must contract in order to thicken the lens.

he retina is the innermost of three tissue layers that make up the eye. The outermost layer, called the sclera, is what gives most of the eyeball its white color. The cornea is also a part of outer layer.

mbedded in the retina are millions of light sensitive cells, which come in two main varieties: rods and cones.

Rods are good for monochrome vision in poor light, while cones are used for color and for the detection of fine detail. Cones are packed into a part of the retina directly behind the retina called the fovea.

When light strikes either the rods or the cones of the retina, it's converted into an electric signal that is relayed to the brain via the optic nerve. The brain then translates the electrical signals into the images we see.

But I am still not clear about the focal length being variable or not. So I don't think I can answer that now. Looking forward to get the answer through proper understanding in the next class. :)

Live