Puzzle: Help Jim

Lora and Jim agreed to play a number game, Lora comes up with a statement that “for any two prime numbers greater than 6 and whose difference is 2, the number between those two prime numbers is always divisible by 6”. How can Jim prove it?

Bokeh Experiments - How To

Seasons greetings everyone.

After my earlier post of Instant miniature studio many had left comments saying it was useful. Thanks for your comments and feedback. With Christmas and the new year aproaching, here is an interesting walk through to make your photographs more interesting this season. This time we are going to play around with the bokeh.

Its fairly simple to get a bokeh like the below one. You need to keep the lens in a low aperture like f/1.8 and with some back ground light. 

But what do to when you want to make it more interesting like the one below? 

Here is how to do it. You can easily try it at home. You will need:

1. Camera and a low aperture lens (50 mm f/1.8)

2. Chart paper, preferably black.

3. Compass and Scale.

4. Paper cutting knife and scissors. 

Measure the diameter of your lens or simply go with the measurement of your filter that you got for the lens. Use that measurement to make circular rings in the chart paper using the compass and scissors. Make sure the ring exactly fits in the lens (one would need to remove any lens filters attached, for this experiment). Now draw shapes(hearts, square, clove, anything) in the center of the circular paper ring and make sure the shapes are exactly at the center. Use the paper cutting knife to cut out the shape that was drawn.

Now it's almost done, fit the circular rings in front of your lens and start clicking. Enjoy the custom bokeh shapes. 

Technical mumbo-jumbo or How It Actually works:
Technically the shape of the bokeh is controlled by the shape of the aperture. Ideally the aperture is made of multiple blades to form a near circular shape. As the number of blades differ from lens to lens, by keeping a high f-number like f/5.6 the bokeh produced might be polygon in shape. Here since the light entering the lens is controlled by a custom shape which overrides the default circular ring of the aperture, it gives the bokeh a custom shape. This said, it is left to each one's creativity to decide the shape and the kind of picture to use these techniques on. 

P.S. It was fun to use the compass after eight years, last I used it was in the Engineering drawing class in the first semester of college.

Framed

My photograph has been selected for display at Bangalore Photography Club's Fifth annual photography exhibition, Frames of Mind - 2010.

If you are in Bangalore on the Oct 22-24 weekend, do come and check out the photographs in the exhibition. There are interesting photography sessions as part of Fotocamp. Meet you there!

Here is the selected entry. This was shot from the 6th floor of Novell's office. If you look closely, you'd see the reflection.

Lalbagh Flower Show

Was visiting my friends place in Bangalore a week back, also knew there was a flower show happening at Lalbagh. Somehow managed to loop in Srihari and his Aunt for the photo shoot on Sunday morning. We reached there early and walked around the park. When the gates opened we had a good 45 mins shoot in the flower show in spite of the crowd and police whistling to move fast. It was a colorful shoot.

For convenience I have uploaded to

• Flickr set
• Facebook album

Let me know your comments.
Happy Clicking!

Photography Day

You know when you're ready

The Art & Science of Photography - Kalyan Varma

Last weekend I did a trip to Bengaluru to attend a workshop conducted by Kalyan Varma (Kalyan Varma is a well known wildlife photographer.) - The Art & Science of Photography. It was a two day workshop covering a wide spectrum of topics. Both the days were well structured that one could learn and also test the skills learnt. Course content was chosen such that it would neither intimidate someone who is very new to Photography nor bore anyone who was skilled relatively.

Day 1:
The first session was about the Science of Photography. Like the school days physics classes, it was on fundamentals, fundamentals and fundamentals. Kalyan gave a very good perspective and understanding on the topics. Even after all the reading I have done on these jargon, I can say, "I have never understood them better than now!". Immediate hands-on in the classroom for some of the concepts were the highlights.

Second session of day 1 was on Art of Photography. It was very crucial to understand the art side of photography. Kalyan handled it well with the approach of "learn by example". He talked about composition of pictures. In the later half of the first session, he spoke about camera gear including body, lens, tripods, flash and bags.

Day 2:
Ah! Saw 6 am in my clock after several months. :) Got up and headed to Lalbagh for a photoshoot with Kalyan and others. It was interesting to have a hands on at Lalbagh with the various subjects present there: people, rocks, dogs and flowers. After a portrait session, we headed back to the classroom where we had a session on post processing. We had an interesting session as to what should be done in the name of post-processing and what should not be, as learning post-processing will give you a total control of your photographs.

Post lunch, we had a critique session where various shots taken by us over the morning photo shoot was discussed and critiqued. Finally we had to call it a day with a conclusion speech by Kalyan, I have a lot to take from the workshop. 

Highlights:
- Kalyan's command on the subject and the ability to carry on for two full days without boring the trainees :-)
- Ganesh and Harsha, who were part of Kalyan's team in conducting the workshop. Along with Kalyan they helped out folks in the classroom as well as the photo shoot. Special thanks to Ganesh for the ride to lalbagh in the bullet.
- "Food" - serious kudos to Casa de Bengluru who fed us some yummy food :-)

More on the workshop here.

Photos from the workshop in Flickr

Instant miniature studio - How To

Two weeks down the Nikon D90, its so tempting to keep it down and she hates it. :-) Last weekend I got a Shrek toy as part of the Happy Meal. Soon after coming home, I wanted to take few snaps of it. So quickly thought of home studio lighting setup to take photos.

All you need is

- A note book, preferably plain white sheets in them.

- Alternate source of light, like table lamp.

- Tripod (preferred)

Nikon D90 on the tripod + table lamp + note book with 50mm lens as the subject

Place the note book like a slanting 'L', this gives white flooring and white background (laptop and few white sheets will also do). It would be nice to slide a paper over the edge, so that there are no sharp curves on the background. Make sure there is no folds in the paper that's used (since it will caste shadow). Set the tripod in front of the notebook with the camera mounted. Now place the table lamb between the tripod and notebook, such that it does come inside the frame of the camera. Also make sure the table lamp does not flare the lens. No place the subject in the tip of the paper that stands sliding and start shooting.

Keep the light at different angles to the subject to get various effect on the subject and control how the shadow is cast. Prefer using the timer shutter to avoid any chance of camera shake. 

Here are some samples and more photos at flickr

Go ahead and comment your feedback and questions.