Rule of -2/3rds

It's possible you've heard of the Rule of Thirds. It's a guideline for composing photographs so that your focus *isn't* the dead center of the picture. This, however, is not what this post is about.

Instead it's a personal rule of mine to override the camera's Exposure Compensation.

Now when you take a picture the camera decides, based on some other settings I won't go into yet, how bright to make the picture. It adjusts (depending on what mode you're in) the ISO (sensitivity to light) and/or shutter speed and/or amount in focus.

More often than not, I find it's a bit brighter than I'd like. Colours are often washed out, and natural things don't look that real.


Normal Exposure

- 2/3rds Exposure

Now it's a little difficult to tell after the fact what the exposure compensation is, since it doesn't show up in most programs - even the ones that normally show the ISO, shutter speed and all that other fun stuff. It is recorded as 'Exposure Bias' in the EXIF information - check the >Properties of the picture in question (Details tab if you have to click farther).



Normal Exposure

- 1/3rd Exposure

- 2/3rds Exposure (/w Auto Contrast in Picasa)

-1 Exposure (/w Auto Contrast in Picasa)

While this is a personal preference, there is a technical benefit as well. When dealing with digital cameras, it's better to err on the side of too dark. Shorter exposure time means less chance for a blurring. If you're happy with the shutter speed, a negative exposure compensation will allow more of your picture to be in focus. When both of those are fine, it will allow for a lower ISO setting, which means less rainbow speckles in the picture and richer colours overall.

Often if something is dark and you'd like it to remain that way in the picture a lot of negative Exposure Compensation is needed.


-5/3 Exposure

Another benefit is making details of white things visible - and not clipped out beyond the upper range of the camera.

 

Normal Exposure (above) - 4/3rds Exposure (below)

 As with most camera rules, there's times when they should be broken. If you're outside on a bright day, but your subject is under some small shadow it would be worth going to positive exposure compensation. Similarly if your subject is backlit and not showing up properly, this is a quick fix.

Most cameras do have Exposure Compensation. However, you will have to go into the letter modes of the settings (previously linked). Some cameras will show it as a fraction, in steps of 1/3 or 1/2 while others will show a decimal value. Check your manual.

Macro Photography

Definition

Now, technically, macro photography only applies to situations where the subject of the photo is the same size as the image sensor (35mm or smaller) - and takes up the whole frame. This is known as 1:1 magnification.

For the purpose of this article, however, I'll simplify to things the size of a quarter or smaller being the main subject.

Method

Generally speaking, there's two ways to go about taking a macro-type shot.

The first is the more obvious. Get as close as possible and take the shot. Many Point and Shoot cameras have a Macro mode - usually indicated by a 'flower' icon. This tells the camera to focus on things that are closer to the camera, rather than things that are farther away (like mountains - the complimentary symbol).

While this method can produces the largest and sharpest pictures of the subject, there's a few drawbacks. One is that you're likely to create shadow, and that hampers the camera focusing, or at the very least, reduces your depth of field (amount of things in focus).

Normally this wouldn't be a problem, but the DOF is very small at close distances already. Not an issue when things are flat and perpendicular to the camera, but that doesn't always happen. Even things as small as bees and flies might not be in focus from front to back or edge to edge (depending on your angle and if you can get them to cooperate).

Which leads to the other problem - most living things (that you'd be taking macro shots of) don't like people in their space. Even if they aren't bothered, trying to get to as close as you can and still being able to see the screen/subject might be difficult.

Bright lighting will help the first problem - but if you're using a flash, it can be overkill. Bright, noisy lights don't help with the second issue either.


So what's the other option? I'm glad you asked (even if you didn't, you're still reading).

It might seem counter intuitive, but put the zoom to as high as it will go and be prepared to stand back. Your minimum focus distance will be quite large - at 10x zoom about 1m/3 feet. The larger your zoom, the more unlike the first method it will be and the farther you'll have to be from your subject. Which is, given the problems listed above, not always a bad thing.

The drawbacks to this method include a lower image quality overall - but better than you might think, especially in bright sunlight. At higher zoom, depending on camera/lighting, camera shake might be a problem. Your angles are also somewhat limited - it's hard to get directly under something that's closer to the ground than your minimum focus distance.


Equipment
As much as I've love to recommend a DSLR camera with dedicated macro lenses to everyone, it's probably not going to happen. While the price of the camera body is coming down a 50mm macro lens is only barely under $400. Still inexpensive for a lens (comparatively), but it's a one-trick-pony. While you *can* take pictures of larger things, a 50mm prime lens will take in quite a bit more light, be a lot cheaper, lighter and quieter. The 100mm and larger macro lenses give a larger working distance and increase magnification as well, but expect the price to double or quadruple (!). Almost as effective is a 250/300mm zoom at the minimum focus distance as seen below - click for full size.

Above: 250mm lens 1.1m/3.6 feet away
Below: 50mm macro lens ~23cm/0.75 feet away

That said, with the sheer amount of information that any camera today takes in, with time, patience and being in the right place at the right time, you can get a excellent shot with just about any camera.

Those Crazy Letters

Most cameras will let you pick them up and start shooting right away. Set the camera to Auto, indicated by a Square, the word 'Auto' or some other picture (all dependant on camera type, but almost always green) and it will adjust the settings for you. A lot of the time 'right' as well. Which is to say they generally get the shadows dark, but not pitch black, and the whites bright, but not blown out entirely. A good number of things are in focus, and - if it's light enough where you are - not blurry.

Certain times you're in a specific situation. Night Portrait, (Day) Portrait, Beach, Snow, Sports/Action, Landscape... and your camera probably has a settings for that too. Indicated by a semi-descriptive picture and the words on the screen when you go through them. Some really go all out and have a rather lengthy list of custom scenarios. (On a beach, at night, while it's snowing and you're lit by candles being slightly too specific, but they're getting close)

But enough about those. They don't really need an article. P Tv Av M. Or possibly M A S P do.

Picture via Flickr - You'll notice I leave out A-DEP, but so do a lot of cameras

Let's go through them from 'easiest' to 'hardest'.

P - Program
When you'd like a little more control over your camera than is possible with the auto function, start here. It unlocks a lot of things like ISO (sensitivity to light, just like film, higher is more), over- or under- exposing the shot, different file options to save (RAW, if the camera has that feature) and so on. Unless you change anything, however, it does tend to act like Auto - in that it does do a lot of the calculations for you. The difference being, you now have the room to nudge them in a certain direction.

Tv or S - Time Value or Shutter Priority
Next on the list, as it does what it sounds like. This is handy for action shots, or wildlife (children included ;) ) that won't stay still. Set the value to 1/200 second (or more) and you can freeze a lot of things that would otherwise look like a blur. The camera still has the room to adjust the aperture - or how much light comes into the camera. The tradeoff being that the faster you set the camera the less number (or more accurately, less depth) of things end up being in focus. Force it to go extremely fast and you'll notice a very dark picture. Ooops. Learning from mistakes is just as valuable as learning from success.

Av or A - Aperture Value
This is where things get a little odd. All you really need to remember is that the smaller this number is, the less of your image will be in focus. Conversely, setting this number higher will result in a lot more things (or specifically depth) being sharp. As always there's a downside to pushing the extremes. The higher you set this value, the longer the shutter has to stay open. Which can lead to movement blurring or past a certain threshold, less sharpness overall. It is, however, quite handy for extremely closeup shots - as the closer something is to the camera the less 'depth' is actually in focus. More on that in an upcoming article.

M - Manual
While the previous two modes had the camera adjust for the 'missing' value, here everything is up to you. You'll notice that if your camera has an option for over- or under- exposing the shot, it, almost paradoxically, vanishes. This is because everything is under your control - so it will be bright, dark or just right based on your settings -- with no help from the camera. As you might guess, this does make things a little tricky. I would very strongly recommend a few test shots in the other modes first so you'll at least have a starting point. This mode is most often used (at least by myself) when the other two modes overcompensate, or vary the 'missing' value and I want to override that.

Example #1: Taking the first shot in some other mode and forcing the same settings for the following shots - with the intent to stitch them together afterwards. Otherwise you could find a wide variance in exposure or amount of the image that is in focus from image to image.

Example #2: 'Forcing' a larger region of focus AND having a short shutter time - at the expense of image brightness - often used when something is both close to you and moving. This is when you can find the other modes are falling short. If the speed is fast then not enough is in focus OR it leaves the shutter open too long (and a blurry image) when adjusting for the focus alone. While I could also go into Tv/Av and say I want an underexposed image, I wouldn't know by how much. It would be easier to set both the Av to what I want (say 5) and the shutter speed to something useful (1/200s).



Apart from spinning the dial, it does vary quite a bit from camera to camera what buttons change the values in question. Do check your manual. If you've lost it, most camera manufacturers also make a copy available online.

Cream of the Crop: Aspect Ratios and You

4x6? 8x10? 4:3? 16:9? Possibly the last thing on your mind when you're taking a picture. Especially so if you didn't know that these setting can often be changed *before* you even line up the shot.

Let's back up a bit.
What are those numbers? 4x6 is a measurement, in inches, of the smallest (non-wallet sized) printed photograph. It's also a ratio which can be expressed in a few different ways. 4x6 = 2:3 = 8x12 = 12x18. The last two are larger common print sizes. 2:3 is the shorthand for that camera setting - but more on that later.

4:3 you might have heard of. It's the ratio for the 'Full Screen' TVs. It's also the default ratio for a lot of Point and Shoot Cameras. Unfortunately, not much else. You can print an 8x6 - but it's rather difficult to find a frame for it.

Why am I going on about this?
In simplest terms some ratios/sizes can best be described as tall (or wide depending on orientation) - such as 4x6, 5:3 (Widescreen Photoframe) and much more so 16:9 (Widescreen TV).

Others such as 4:3, 8x10 and 8x6 can more aptly described as square-ish.

... And your point is?
As mentioned in the beginning of this post - you can likely set your camera's aspect ratio. Depending on what you're going to do - show them on a 'full screen' TV, widescreen, print 4x6s or 8x10s - it might be worth it to plan ahead. Either by changing the camera's settings and/or composing your shot with the above in mind.

If I don't?
Quite simply, you're going to lose some of your picture.

You'll have to crop it down - making for more work and possibly some tough decisions - OR leave that process up to the software on the Kiosk. There's a good chance you won't notice, if the edges of your picture are 'background' you'll probably have to see a side by side comparison of the print and the preview to even see what's missing. If you're someone who likes to go edge to edge- watch out!

There is a somewhat helpful second option, which I'll refer to as 'Anti-Widescreen'. Since the 'highest' setting of the average point and shoot camera is often tied to the less than ideal 4:3 ratio this name fits. What you can do on most Photolab Kiosks is to 'Zoom Out' a picture - which will *add* white bars to the left and right edges of an otherwise squarish picture to fill out the rest of the 4x6. If you don't like the television 'Widescreen effect' - this probably won't sit well with you either. The purpose, however, is the same - you don't lose any of your picture - you just 'gain' nothingness.

A point and shoot camera set at 4:3 - image cropped (somewhat poorly) down to the ratio needed for a 4x6 print

Camera set to 3:2 ratio - cropped in preparation for enlarging to 8x10 

The software pictured above is Picasa3(.6). A rather handy program for organizing pictures, pre-cropping them and a number of other useful tasks. With the latest version you can even set your own custom cropping ratios. It's also free and a rather small download. Various plugins can be used to help you upload to sites like Facebook.

Out of the shadows....

Every so often I find a 'new' feature in Photoshop. Which is odd - since the feature in question usually isn't new and I've been using the program rather heavily for the better part of 10 years.

The most recent discovery is the Shadow/Highlights adjustment. It became a part of Photoshop in CS(1) - as of writing CS5 is almost due - and is also available in the more recent Elements versions.

While there are many ways to adjust pictures values in this way - brightness/contrast, levels, dodge/burn, exposure - Shadow/Highlights is both easier to use successfully and more dramatic in effect.

Quite simply, it takes the extreme areas of an image (without having to pre-select them) and drags them back to a normalized value. Which is probably best shown with pictures.

Unaltered image:

Shadows 50%

Highlights 50%

Highlights 50% + Shadows 50%

The only slightly confusing bit is that you're reducing the appearance of the said regions - so as shown above 50% Shadows makes the image brighter overall and 100% Shadows is even less 'dark'.

There's also an "Show More Options" version of the toolbar (at least in the full Photoshop) that will let you tweak things even more. Which probably wouldn't be a bad idea - as nice as the defaults are at bringing out 'hidden' detail - they tend to make the pictures more than a little 'flat'.

Original image inside red circles, 50% Shadow outside - Note how the water doesn't change much

More dramatic example - Shadow 100% on the right side of the image

How to Buy a Digital Camera - Part II

Card Type
Most cameras today take SD / SDHC cards. As a result, you have the most choice in card size, manufacturer and the likelihood of multicard deals increases. The HC addition (under the letters SD in the graphic) apply to cards 4GB and higher - these cards will likely not work in pre-2007(ish) cameras.

While they are the most common type - there are definitely exceptions:

Older Sony cameras take Memory Pro Stick Duo cards - same type as the PSP uses. They are more expensive than their SD counterparts and can also be harder to find. Newer Sony cameras take both SD-type and Memory Pro Stick Duo cards - still worth double checking though.

Older Olympus/Fuji cameras take the xD type card which - along with being more rare than either of the cards mentioned above - are also limited to 2GB. To get around this, some Olympus cameras come with an adaptor that takes a MicroSD card and puts it in a xD 'housing'. Newer Olympus/Fuji cameras are using SD though.

Some SLR cameras use the deceptively named Compact Flash card (it's actually the largest in physical size). Again rarity is an issue, though price is generally comparable to a similar capacity SD card. It can also have a speed edge on the SD type cards - but this only a factor if the camera itself isn't the bottleneck.


All of these cards have a rather long lifespan (10k-100k write cycles) and even the smallest commonly available (2GB) hold over 500 (jpg) pictures. As such, it might be tempting to dismiss the above information, get a few cards with the camera and be done with it. Of course, cards do get lost and not all external/internal card readers can accept every type and shape of storage. While memory cards are coming down in price, it's nice not to have to buy a new set of cards when/if you change/upgrade/replace cameras. Go with SDHC compatible.

Features
A lot of devices today go quite a bit beyond simply taking a picture. Often these features have a varying degree of sophistication from model to model. A few of the things you might want to look out for:

Image Stabilization
It is what it sounds like. As covered in a previous post, the feature really helps with indoor shots. Be careful to read how the camera is accomplishing this though - if it mentions 'digital' don't bother.

This is a very common feature of most new point and shoot cameras. In some SLR cameras it is lens based and, as it absence reduces the price by a large margin, is still fairly common to find them without it.

Face Detection
At it's most basic, it determines if there is a person looking at the camera and focuses on them (as opposed to the background). It may also adjust the exposure/white balance and determine if a flash is necessary.

Smile Detection
A rather cool, if somewhat creepy, feature of a camera to detect if someone is smiling - often to a variable threshold - and automatically take the picture.

Blink Detection
Still somewhat more rare than the above, this detects if someone has their eyes closed and either notifies you, or automatically takes a second picture.

Creative Effects
Black and White, Sepia, Fish Eye, Miniature Effect, Selective Colour, Red Eye Reduction and many, many others may be present on an increasing number of devices. Personally I prefer applying these effects after with software as it allows for greater flexibility - and undoing it if it doesn't work. On the other hand it does make picture taking more 'fun' and less workflow if it's on-camera. I wouldn't recommend getting a specific product for any of these features - but if you do have them, at least try them out.

Photomerge

Fortunately, not everything in Photoshop is labour intensive. Some of the coolest stuff is automated.

While some newer cameras have image stitch (panorama mode or another name depending on brand), they are somewhat limited in what they do.

Essentially these lock the cameras setting and let you 'weld' a few pictures together. It can also show you a bit of the previous image to help guide you on how much overlap you need. Also, it doesn't alter the perspective and the fixed camera settings aren't always helpful.

This is where Photoshop (full or elements) comes in. Open the pictures you want to merge and tell it to go to work.

I'm told that not everyone likes the music to this. Tough. Turn it off if you want :p



A couple of things to keep in mind:

1) It will only alter the perspective to about 120º - after that it does a cylindrical mapping - in plain English, straight lines become curved.

2) You *might* want to scale down your pictures first. Most cameras output a very large file and you're asking the computer to load them all into memory, find where they join, match perspective and do brightness/contrast calculations. That's a lot of work, and if it can't do it all, it usually skips the last things in that list or possibly not even match it at all. You can still manually align the pictures and have it more likely to merge that way, but it's best to let the computer do it. The combined file will still be huge and more detail than you need - especially if you do the trick in #4

3)You still need a bit of overlap. The Photoshop help file recommends 25-40%. Having a notable object at the extreme right of a picture, then extreme left on next shot is usually sufficient.

4) Unlike cameras, you aren't limited to horizontal or vertical stitching.