DIGITAL PHOTOGRAPHY NEWS FROM ePHOTOzine

 

What Is A 'Fast' Lens?

When you hear the term 'fast lens' it means that the lens in question has a large maximum aperture (the bigger the aperture, the faster the lens will be). The aperture is often displayed as an f followed by a number but do remember that a large maximum aperture will actually be a small number such as f/1.8. A fast prime lens would be considered fast when it has a maximum aperture under f/2.8. However, if the lens is 300mm or longer, an aperture of f/2.8 would be considered to be fast and the same goes for zoom lenses.

 

Let's Talk Apertures A bigger aperture (small f-number) will allow more light to reach the camera's sensor which means faster shutter speeds can be used even in low light situations. They're useful in various shooting situations including places where flash can't be used, at concerts where there's not much ambient light, indoors when you're trying to capture movement such as dancers on stage and for subjects such as sports photography where fast shutter speeds are essential.

 

Nikon 50mm f/1.4D lens, Different apertures: f/1.4, f/4, f/16. More on exposure and camera settings here.

 

You Can Work Hand-Held

Another advantage to fast lenses is that you won't always be forced to use a tripod as the faster shutter speeds allow for hand-held shooting in more situations. This is something that's particularly useful in places where tripods aren't allowed such as in cathedrals or in busy locations where light can be an issue such as in a museum.
 

The Negatives

A downside to fast lenses is that they can be expensive and they tend to be heavier and bigger than other lenses. Care needs to be paid to focus when using autofocus as you may find it tries to focus on the wrong part of the shot, leaving focus on an area of the image that wasn't your intended subject. It's also worth investing in a good quality lens so images don't appear soft when viewed on-screen.

 

You've read the technique now share your related photos for the chance to win prizes: Daily Forum Competition

 

Orientation names suggest that landscapes should be landscape format and portraits should be portrait format and even though there are times when the subject will dictate the orientation, there are scenes where switching to portrait will benefit the shot. 

Landscapes are very different when they are upright; they have much more depth and tend to emphasise the contrast between foreground and background.

The height of the picture allows you to make more definite use of perspective, especially if the foreground has a linear quality about it such as a field with ploughed furrows. The shape also gives you a more obvious opportunity to choose the position of your horizon. The rules of composition favour placing the horizon at a third from the top or bottom (actually three-eighths from top or bottom – which is fairly accurately the ‘golden ratio’). However, do experiment with more extreme framing to see what happens: placing the horizon right at the top or near the base of the picture.          
Depth of field in landscape is rarely a serious issue, but if you like to play with focus then the emphasis that the format places on the perspective will also give you opportunities to exploit shallow depth of field. Of course, you can do this in a horizontal picture too, but it seems to crop up more often this way round.
Do remember that not all of us get it right every time and being able to change the orientation of a picture by cropping can change the dynamic of the shot entirely so it's always worth having a look at your images once home to see if a quick crop will improve your shot.    

You've read the technique now share your related photos for the chance to win prizes: Daily Forum Competition