How does the numbering system for camera lenses work? - is camera lenses a disappointment
I am looking for a camera, and I do not understand the numbering system for lenses. They have separated two by a hyphen, I've seen it all, 28-40 and 70-200, and all sorts of things in between. Can someone explain?
Even though everyone knows, the same number is applied to lens the film too?
Monday, December 7, 2009
Is Camera Lenses A Disappointment How Does The Numbering System For Camera Lenses Work?
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8 comments:
These numbers are the focal lengths in millimeters. If all 35-mm film were shot these figures a kind of universal significance in relation to the rising number of a lens s. But, with digital cameras, that changes as a bird dfferent sizes from various sensors (in contrast to all cameras with the same screen area opposed) to it - a 35-mm negative film. The result is that the focal length in millimeters not say specifically what the goal is reduced (unless you know the size of the sensor and do the math)
Whatever ...
If it is 2 numbers, the zoom.
The lower number represents the shortest focal length (wider field of vision) and the highest number of stands) for the longest length and narrower field of view.
A lens is a 28-40 wide angle zoom lens into a "normal" (for 35-mm film camera)
70-200 is a telephoto zoom lens, low to medium telephoto power checks power.
I may have at least 2 glasses, but I like the big gaps in my area. If you are 28-40 and 70-200 had therefore a target, you miss the most "non --Rmal focal '40-70. But many people have a high quality fixed focal length 50mm lens to fill the gap.
Also here are the descriptions on film cameras and lenses to 35mm. With the same lens of a camera Digial things can be very different.
I will not repeat all the other answers you gave good answers. But I do not really think you know exactly what the wide-angle zoom like you.
In the 35-mm photography, a lens with 50 mm as a "normal" lens. This means that a field of view is very similar to what you see with your eyes.
If you get less than 50 mm, ie a 20mm lens, it is considered a large angle, because the goal is really to see "or take over the landscape that we see when we watch the same scene, with eyes .
When you enter the longest of the activity of 100 mm, this is known as a tele-zoom or. I'm sure you looked through the binoculars. You see things closer, but much less of the scene. Only a small part of the scene is, in relation to that are regarded as the eyes can not see normally, but the object (s) looks much closer than it actually is.
The target is a 24-70 wide angle to medium telephoto.
Crop factor has already been mentioned. Most digital CAmerica has a sensor that is smaller than the size of 35 mm film frame, so in fact, "culture", the field of view lens "sees. The factor of culture in a digital SLR camera is usually around 1 5. Sun states in a 24mm lens on a digital SLR field for a lens of 36 mm cameras 35mm. (24 x 1.5).
Yes, there are some digital SLR cameras have sensors the same size as the 35-mm camera and lens functions of "normal" in these spaces.
But since the state to buy a camera, you will ensure there are no worries about crop factor sensors.
What their "stuff in the middle" is probably the first number to be seen. These often vary with the zoom focal lengths. More expensive increases have a constant aperture will not change as you zoom the lens.
steve
The numbers are the focal length of the lens. The focal length controls and things that all aspects. The numbers on the range (17-85mm, which are, for example) for zoom lenses - can change the width / FAR something seen in a zoom.
The numbers are the same for film lenses.
Film is expensive - Get get yourself a good market for digital cameras with interchangeable lenses and a lot!
its focal length
its a meteric measured in millimeters, heres some conversions for you:
100 mm = 4INCH
1 inch = 25 mm
Look for focal lengths, or ask here ..... a focal
same thing in the film and Digi - but the best are full-frame SLR digi so everything you need for a factor of the "conversion" or culture
a
Simple answer ... The higher the number is less "Zoom" is .... very few women are in the range 12-28 wide angle .... high numbers, with more than 200 would be far-reaching ... over 400 - Super Zoom long. (These estimates are abviously and it does not take into account the variety of lenses on the market ).... It is a very general definition .... to consult the appropriate provider for more information ....
Basically, the higher the number, the more you can object.
There you go.
http://farm4.static.flickr.com/3012/2349 ...
Here is a mini-tutorial, I have to compare focal lengths. This is not an objective test or an examination of the camera! It is merely to show the difference between the different focal lengths. The aim was the Nikon 18-200 VR, which (by definition) an objective 11x, 11x, but can not say what the final picture will look like target. I added another photo with a 300-mm lens used. The camera was a Nikon D200, so there is a 1.5X factor, "Culture," "lens factor" or "extender. A more detailed explanation of the image itself, it would be nice if you click" All sizes "above the picture.
http://www.flickr.com/photos/7189769 @ N04 ...
This was done with two different objectives: the Nikon 17-55 and 70-300:
http://www.flickr.com/photos/samfeinstei ...
How is the film or digital, the focal length exactly what it says the number was. It is physical. What happens to the picture if it depends on the film or sensor the size of the film or sensor. This is called the "culture" de facto --R, but also refers to you as a factor of the lens focal length, or extend it. Here's a great little tutorial is to explain. There are some examples that explain almost without reading text. http://www.dpreview.com/learn/?/Glossary ...
In my example, you see that I used two digits. One is the actual lens and the other hand, is equivalent "to 35 mm, taking into account the crop factor.
Pooky has released its sample, which is excellent.
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