Tag Archives: Digital Photography

Going beyond the device: Expanding the horizons of Super Zoom

Have you ever pushed your device to the limit? Have you ever made your device do what it was not meant to do, like over-clocking your CPU or Jail-breaking your iPhone? I just did something like that. Only it’s something much safer than over-clocking or jail breaking. And I did it to my camera.

I have been using a Super Zoom camera for a while now. A super zoom camera comes with a lens that can go from a Wide Angle to Super Zoom. The Canon SX 40 HS is a good example as it can go from 24mm (wide angle) to 840mm (super zoom).

There are some advanced features that are not available in a Super Zoom. One of the most important missing features is a Remote Shutter Release option. Some DSLRs come with a Wireless Shutter Release option where you can mount your camera on a tripod and take the picture without touching the camera.

Many a time I’ve really really needed a Remote Shutter Release option. For example, when I take photos of the Moon/Super Moon or when I take artsy pictures at night. My super moon picture:

Downtown Vancouver at night:

[For more photos, visit my Photo Blog]

In such cases, I have either zoomed in quite a bit, or am taking the picture in low light conditions. The slightest shake translates into a very bad picture. To avoid shaking the camera in such cases, I usually activate the 10 second timer. But there is some residual oscillation (shake) which sometimes messes up the photos. Reading the camera’s user guide told me that that there was no inbuilt no Remote Shutter Release option available. I also visited many specialty camera in the hope of finding an external device that could act as a remote shutter release. To my utter disappointment, I could not find such a device.

Then, one fine day, I discovered CHDK – Canon Hack Development Kit. This is an open source community that creates programs for Canon cameras to add capabilities in addition to the existing features, for example, a Remote Shutter Release option. So, I decided to build my own Remote Shutter Release kit. Here’s what I did:

(A) Installed CHDK on my camera (the easy part)

To install CHDK:

  1. Go to the http://chdk.wikia.com/wiki/CHDK
  2. Check the firmware version on your camera.
  3. Download the correct build based on the firmware version. Unzip it on your computer.
  4. Copy the CHDK files on the SD card.
  5. Insert the SD card in the camera and press the Review button.
  6. Go to  Menu and update the firmware.

The program is loaded into the memory temporarily. When you shut off the camera, it is removed from the memory. The program does not interfere with the manufacturer’s original firmware. CHDK also provides a detailed user guide.

(B) Created a physical Remote Shutter Release device (the most difficult part)

I searched the Internet and discovered that I have to build a remote shutter release device on my own. I found a great video of a camera user who had built a shutter release device from scratch. I could not follow the same path since I am not as tech savvy. Imagine the trouble if I were to solder a diode onto a circuit!. Moreover, being a technical writer by profession, I believe in simplicity. I wanted a solution that was simple, easy to implement, easy to use, and of professional quality. I could not build a remote shutter release device, and nobody sold one for my camera. It seemed like a dead end.

Numerous searches on the Internet provided no answers. However, I discovered a few things that helped me create a solution for myself:

  • Send > 4V on the data port of the camera to release the shutter.
  • A very high voltage (> 8V) might damage the camera!

I performed some trial-and-error experiments and discovered a very simple solution for the problem. I used the following readymade components:

  • Duracell USB Battery Backup: I used the Duracell USB Battery Backup to experiment with the Remote Shutter Release feature of CHDK. The Duracell USB Battery Backup is rechargeable, has an ON/OFF switch, and is slightly bigger than a matchbox. It has a USB (output) port for charging external devices and a mini-USB (input) port for charging the backup battery.

  • Mini-USB cable: I used a mini-USB cable for the solution. You can easily use the data cable that came with the camera.

(C) Made the hardware and software work together

To make the hardware and CHDK software work together:

  1. Install CHDK on the SD card and update the Firmware [as explained in (A) above]. Once CHDK is in the memory, go to the CHDK menu and enable Remote Shutter. (Print button + Menu button displays CHDK menu.)
  2. Connect the mini-USB cable to the camera’s data port and the other end to the USB port on the Duracell USB Battery Backup.
  3. Switch ON the Duracell USB Battery Backup and Switch OFF immediately. The camera focuses.
  4. Switch ON the Duracell USB Battery Backup and Switch OFF immediately again. The camera releases the shutter!

And I am sure this solution will not damage the camera. Here’s the simple reason why: The camera is designed to use a mini-USB cable that is connected to a computer’s USB port (which has a ~4V output). The Duracell USB Battery Backup also has the same output since it is basically a USB port without the data transmission capabilities.

I was amazed that another device could work as a remote shutter release for a camera that was not built to use one! Amazon, eBay, camera stores, and photography forums did give me ideas for creating this seemingly simple solution. So I thought I must share this discovery with all the other Super Zoom users out there that are also looking for something similar.

Happy Super Zooming!

More information about the Duracell USB Battery Backup: http://www.duracell.com/en-US/product/instant-usb-charger.jspx

Update: May 12, 2012: If you want to use a clicker-like device, the iGo Anywhere USB Micro/Mini Charger would be ideal. Instead of a switch, you could use the button to release the shutter. For more information about iGo Anywhere USB Micro/Mini Charger, visit the Source website here. I tested it out and it works perfectly fine.

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DSLR Concepts: The watered down basics

For as long as I can remember, I have been a point-and-shoot enthusiast. After using a bridge (SuperZoom) camera for a long time, I finally upgraded to a DSLR.

When I upgraded to a DSLR, I started learning about the various aspects of DSLR photography. I read many blogs, websites, and books that attempted to explain the basics. In my humble opinion, however, all these sources were a little too technical when it came to explaining one concept – exposure.

After reading the definitions from various sources, I would always come away with a few questions:

  • What does exposure really mean?
  • What is the relationship between aperture, shutter speed, and ISO?
  • Do I really need to understand these concepts to take good photos?

For a person who has been taking photos for over a decade now, I found these concepts intriguing. I found a lot of technical explanations online for aperture, shutter speed, and ISO. But just like exposure, I found nothing that tied them all together in an extremely simple manner.

This blog post is my attempt at explaining the basic concept of exposure, as I understand it today.

What is Exposure?

A photo is all about light. Exposure is nothing but the quantity of light that is used to create a photo in a camera.

Before going into aperture, shutter speed and ISO, let us try to understand what one must do to fill 1 bucket of water. (Huh?)

Let’s assume you have the following three items to fill 1 bucket of water:

A pipe that carries water.

A valve that opens and closes.

A bucket of a certain size.

For the sake of simplicity, let’s say you could fill 1 bucket with the following parameters:

Use a pipe of 10-inch diameter.

Open the valve for 10 seconds.

Use a bucket of a 10-liter capacity.

It’s simple isn’t it?

Let’s compare the idea of filling 1 bucket of water to the concepts of photography:

Pipe = Aperture (the diameter of the opening that allows light into the camera)

Valve = Shutter (can be opened for a pre-defined number of seconds)

Size of the bucket = ISO (time taken to fill the bucket; smaller the bucket, the faster it fills up).

So, based on how much water you want, you can fill 1 bucket of water in any of the following ways:

  • Use a 10-inch pipe, open the valve for 10 seconds, and fill a bucket of 10 liters.
  • Use a 5-inch pipe, open the valve for 10 seconds, and fill a bucket of 5 liters.
  • Use a 10-inch pipe, open the valve for 5 seconds, and fill a bucket of 5 liters.

Water vs. Light

The world of DSLR photography with light is not different from filling water in a bucket. You can create a photo by adjusting any of the following parameters to adjust the quantity of light used to create a photo because:

Exposure = Aperture + Shutter Speed + ISO

  • Aperture: Increase the Aperture for more light and decrease it for less light.
  • Shutter Speed: Decrease the Shutter Speed (shutter stays open for a longer duration) for more light and increase the Shutter Speed (shutter stays open for a shorter duration) for less light.
  • ISO: ISO defines how sensitive the sensor is to light. In the older non-digital camera days, films were used to take photos. A term called film-speed was used define how soon the photo was created on the film when light fell on it. A 100 film-speed was less sensitive and 200 film-speed was more sensitive to light. With DSLRs, the term called ISO is used to define how sensitive the sensor is to light. The higher the ISO setting on your camera, the more sensitive it is to light.

Theoretically, you could increase one parameter and decrease the others to ensure that the same quantity of light creates the digital image.

Here are a few examples of a candle photographed with different settings:

1) Auto Mode:

2) High ISO (More Sensitive to Light): Aperture f5.6, Shutter Speed 1/125 second, ISO 1600

3) High Shutter Speed (Less Light): Aperture f5.6, Shutter Speed 1/1000 second, ISO 100

4) Low Shutter Speed (More Light): Aperture f5.6, Shutter Speed 1/5 second, ISO 100

4) Low Aperture (Less Light): Aperture f16, Shutter Speed 1/125 second, ISO 100

If you are using a DSLR in Auto mode, a good way to see the values for Aperture, Shutter Speed and ISO is to view the properties of the photo. Better still, you can adjust these parameters to see what effect this has on a photo.

You don’t really need to know these concepts to take a good photo in Auto mode. However, to upgrade from a point-and-shoot mode to a serious hobbyist mode, these concepts are extremely useful. There is so much more you can do in composing the photo if you know how these concepts (Aperture, Shutter Speed and ISO) work together to bring a ‘Digital Photo’ into existence!

Stay tuned for future blog posts on other photography concepts like f-stop, crop factor, and lenses.

To see my photos, visit my Photography Blog.