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I must admit it is each time even more exciting to write for you. The fun part this time is: further features of lenses! You do know how they are built by now but I guess you are still trying to figure out what those little pieces of glass (simplifying it a little) can really do for you? Let me tell you – they can do quite a LOT! Those amazing possibilities are coded though and for those new might sound quite mysterious. So to make life more beautiful I’ll explain it for you in nice & easy way. Lovely

Focal Length
“The distance from the surface of a lens or mirror to its focal point.”
Focal length is usually measured in millimeters and because of the length and effects of the lens we can divide them into: normal, wide angle and telephoto.
What it basically means is that the shorter the lens the wider the angle (and the more you can include on the picture). You can see an example of the effect of one of the widest lenses available on the next page. On the other side the longer the lens the further you can see or do close ups with more detail. I will devote the next article especially to this subject.

USM
(which stands for)
Ultra Sonic Motor
“ the motor that controls the movement of the lens or focus ring. An ultrasonic focus motor is much quieter (almost near-silent) and also moves the focus lens or ring faster when compared to a standard motor.”
It is also known as ultrasonic focus motor and it works when the lens focus is set on automatic. This feature provide the benefit s for the occasions when the work of the lens could be disturbing with its loud sound (for instance when shooting in a recording studio or during a ceremony).

Aperture
“A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.”
Aperture is measured in F stops. Each lens has different F/stop minimum and maximum.
In practice the smaller the number the wider (larger) the aperture, which mean there will be more light rays passing through the opening. It makes only the focusing point sharp but the effects are amazing. Human eye has an aperture of f/1.4. Good lenses with this aperture cost quite a lot and some of them even a small fortune but the final product is definitely worth it. On the other hand with higher number the opening gets smaller but the focus area is widening making landscape photography achievable. Have a look at the example pictures on the next page.

CPU
(which stands for)
Central Processing Unit
“electronic components embedded in the connection between the lens assembly and the camera body. These are usually simple photo-sensitive circuits that convey information to the main camera computer, hence: CPU.”
What it means in fact is that most lenses equipped with auto focus are CPU, and most of the old types that were focused manually are non-CPU.

IS
(which stands for)
Image Stabilization
“ A family of techniques used to reduce blurring associated with the motion of a camera during exposure”
There’s loads of different ways to stabilize the image and one of them in the higher end cameras as built in stabilizer

Lens Mount
“an interface — mechanical and often also electrical — between a photographic camera body and a lens”
It is important to know which lens mount is suitable for your camera as different companies produce various connection types. For instance if you want a lens for a canon camera it must have EF or EF-S mount, whereas for Nikon you will need F mount.
It is possible to buy adapters which are the connections between various lens mounts and cameras that were not created for each other ;)

L lens
(which stands for)
Luxurious
“L lenses are Canon's top-of-the-line lenses (…) A reference to the lenses' high price and proclaimed build quality.”
Canons L series is probably the best quality on the market available at the moment. It’s resistant built and all the features makes it appear on most photographers wish list.

wosThe above picture was taken with the so called fisheye lens. It is a wide lens of which focal length is very short therefore you can view the angle of nearly 180 degrees. It is great if you want to create a little deformed but dramatic effect.

kuczynska leftThe picture on the left was taken with the aperture of f/7 whereas the picture below f/1.8. As you can see the focus point is more defined on the picture with larger aperture. It isn’t as clear what is behind the subject of the photo. It is very useful to use larger apertures when you are concentrated on a certain point of the image and you want to let your creativity spread its’ wings.

kuczynska rightIt is important to understand the tree main factors when taking pictures. The magic if the perfect picture is pretty much sealed in the secret of being able to synchronize the aperture with the speed of the shutter and the sensitivity of the sensor. Everything depends on the light available and the effect we desire.

When using large apertures you will notice the blur in the background which sometimes will shape in circles (picture below). Those circles are called the circles of confusion. The shape of circle depends on the shape of the aperture opening. If you apply a filter in the shape of a heart you can have heart shaped “circles” of confusion. How cool is that!

Photo: Anita Kubala / Agnes Kuczynska

kuczynska bottom

Ostatnio zmienianyniedziela, 15 wrzesień 2013 17:32

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