Comparing 18-55 with 18-200 - need advise

S

super

Senior Member
I am new with DSLR and lens - trying to gain my knowledge for lens and camera

I would like to know that:

Havind 18-55 and 55-200 is equals to having 18-200 ?

My understanding of lens is that having 2 lens that can capture the range from 18 to 55 and second lens with range 55 to 200 is same with having just one lens of 18-200 ? as it will capture the range from 18 to 200.


I see these numbers like 18, 55, 200 etc as ranges as 55-200 can't zoom out much so it captures less area and 18 -55 can capture good area but can't zoom in much.

please advise ?
 
Last edited:
S

super

Senior Member
Yes, I looked at it and based on that I explained my understanding. So this is correct that ? 18-55 & 55-200 EQUALS 18-200 ?
 
S

super

Senior Member
Last question - I have noticed that with 55-200, I am able to take a picture with object in focus and background as little blurred. But I don't see that effect in pictures taken from 18-55 ? The rotation on lens only gives me option to see a picture clear or blurred and zoom, that;s all - why ?

18-200 will have same effect that I get from 55-200 with object in focus and background as blurred ?
 
Horoscope Fish

Horoscope Fish

Senior Member
super said:
Last question - I have noticed that with 55-200, I am able to take a picture with object in focus and background as little blurred. But I don't see that effect in pictures taken from 18-55 ? The rotation on lens only gives me option to see a picture clear or blurred and zoom, that;s all - why ?

18-200 will have same effect that I get from 55-200 with object in focus and background as blurred ?
Click to expand...
This effect is what is know as Depth of Field and a full explanation of this concept can be found here:

Understanding Depth of Field

My own simple explanation follows:

The blurriness of the background depends, primarily, on two things: 1. The aperture used to take the shot and, 2. The distance between your in-focus subject and the background. Other things like the compression factor of using a zoom lens can also contribute but I'm going to try and keep this explanation relatively short...

Smaller apertures will make your backgrounds sharper and more in focus. Larger apertures will make your backgrounds less in focus and blurry.

The greater the distance between your in-focus subject and the background, the more blurry your background will be; assuming apertures of the same size.

Why some of shots looked one way, and others another I can't really explain without seeing the shots themselves along with the EXIF data that would tell me how the shots were taken.

....
 
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