Technology Explained, Practice
Daniela Bowker
Resolution and pixels and image quality! Oh my! ...

When you hear the term 'high-res' thrown about with such abandon when it comes to images for web use, have you ever stopped to think just how big or how high quality and image meant for the web needs to be?

Resolution and pixels and image quality! Oh my! Saving images for the web
Feature Articles, Photography Theory
Haje Jan Kamps
Low-contrast photographs don't have to be boring

There's an assumption that high-contrast images are more dynamic, more compelling, more inviting. Have a go at some low-contrast photography. You might surprise yourself with the results.

Low-contrast photographs don't have to be boring
Feature Articles, Theory
Daniela Bowker
Seeking balance in your photos

Balance doesn't mean symmetry; it means an internal consistency and tension within your photos. And it's a vital element of composition. 

Seeking balance in your photos
Feature Articles, Photography Theory
Haje Jan Kamps
Training your photographic luck

Great photos might be down to a little bit of luck, but most of that 'luck' you make yourself. Don't believe us? Read on...

Training your photographic luck
Feature Articles, Practice
Daniela Bowker
The ups and downs and ins and outs of ...

Photographing buildings doesn't have to mean wide-angle lenses and fretting about correcting for the keystone effect. Any lens, and angle. Don't believe us? Let us show you!

The ups and downs and ins and outs of photographing buildings

focal length lens

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How the iPhone copes with only having a f/2.8 aperture

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If you ask any photographer whether they would be willing to take photos with a fixed focal length lens, many would say 'yes'. Prime lenses are as old as photography itself, and there are many excellent reasons to embrace them. Ask the same photographer if they'd be happen to work with a fixed-aperture lens, however, and you wouldn't get many good responses.

And yet, this is the reality of taking photos with an iPhone 4: It doesn't matter how bright or dark your scene is, you're stuck with a f/2.8 aperture lens. This is a problem if you want to use the iPhone with an external flash (not that you could anyway - here is why) - but how does the iPhone cope with extremely bright situations?

The lower limits

As you (probably) know, an exposure is controlled by 3 factors: ISO, Aperture and shutter speed. If aperture is fixed, you have to deal with any lighting situations with the other two. In low light, the iPhone will ramp up the ISO.

In fact, if I press my iPhone against a dark surface and take a photo, the camera reveals its limits:

photo_2_2.jpg

This incredibly boring photo reveals the limits of the iPhone's camera: It won't use slower shutter speeds than 1/15th of a second, and it won't go beyond ISO 1,000:

screen_shot_2012_08_16_at_150955.jpg

The upper limits

Similarly, it's easy to test the iPhone's upper limits, by pointing the camera at a ridiculously bright light source. The sun will do. This photo:

photo_2.jpg

... Reveals the other set of extremes:

screen_shot_2012_08_16_at_151109.jpg

... Which is that whilst the iPhone is still stuck at f/2.8, the maximum shutter speed is an incredible 1/30,000th of a second.

Putting these two figures together (about 4 EV steps of ISO and another 11 EV steps of shutter speed) reveals the exposure range available to an iPhone  photographer: an impressive 15 stops of difference from the lowest light to the brightest lighting situations.

Of course, this is nothing compared to the extreme shutter speed, aperture, and ISO ranges of modern SLR cameras, but hey - it's not bad for a device you keep in your pocket at all times!