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post #41 of 69
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Quote:
Originally Posted by r31ncarnat3d View Post
Zoom = the focal length can be changed. There is no such thing as "zoom length".

The 18-55mm IS itself is a standard zoom, meaning it's a zoom lens that uses the "standard" focal lengths. Standard = ~30mm-60mm (with variations in interpretation between people). If you're asking for telephoto, then no, the 18-55mm is not a telephoto as telephoto usually means 70mm+.

For a telephoto lens, I'd suggest the 55-250mm IS. It's cheap yet performs well, especially for the money. ljason8eg got some very nice shots with the lens for his NASCAR shots. Skill really does go a long way, and inexpensive equipment like the 18-55mm IS and 55-250mm IS do perform well if you have the skill to properly handle them.

As for the aperture question, nothing will happen. The camera won't let you change the aperture higher than the lens is capable of. With your 18-55mm IS for example, at the wide focal lengths your maximum aperture is at f/3.5. When you try to make the maximum larger, the most you can get is f/3.5, and the camera won't go any further.

Beyond that, it's impossible to get an aperture larger than your max. It's a physical limitation of the lens. Imagine opening up a window; the more you open the window, the more air you let in. There comes a point however when you can't open the window any further because of the limit placed by the window frame. It's kind of the same thing here.
thats what i meant focal length, the mm is showing you how far it can actually got. I really appreciate this, very good knowledge. Another question that little ring they usually put around the lens, is that to block sun light of some sort?
 
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post #42 of 69
Quote:
Originally Posted by sotorious View Post
thats what i meant focal length, the mm is showing you how far it can actually got. I really appreciate this, very good knowledge. Another question that little ring they usually put around the lens, is that to block sun light of some sort?
They can be all sorts of filters, but I'm guessing you're talking about UV filters specifically.

With UV filters, eh, it's debatable. Some people say it's to eliminate lens flare and cut down on UV, some people do it to protect their front element from scratches, and some people say it lowers IQ and introduces more flare.

But when people put UV filters on, it's usually to protect your front element or to cut back on UV and/or lens flare.

However, you can also put on other filters as well, and aren't limited to UV filters. CPLs for example are a very commonly used filter.
post #43 of 69
Thread Starter 
Quote:
Originally Posted by r31ncarnat3d View Post
They can be all sorts of filters, but I'm guessing you're talking about UV filters specifically.

With UV filters, eh, it's debatable. Some people say it's to eliminate lens flare and cut down on UV, some people do it to protect their front element from scratches, and some people say it lowers IQ and introduces more flare.

But when people put UV filters on, it's usually to protect your front element or to cut back on UV and/or lens flare.

However, you can also put on other filters as well, and aren't limited to UV filters. CPLs for example are a very commonly used filter.
I see. Just to make sure i am understanding this. what is the definition of a "prime" lens?
 
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post #44 of 69
Quote:
Originally Posted by sotorious View Post
I see. Just to make sure i am understanding this. what is the definition of a "prime" lens?
A lens with a fixed focal length. It's the opposite of a zoom lens. A zoom lens can change focal lengths, whereas a prime lens is at a constant, fixed focal length. The 30mm in my sig is a prime lens.
post #45 of 69
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Quote:
Originally Posted by r31ncarnat3d View Post
A lens with a fixed focal length. It's the opposite of a zoom lens. A zoom lens can change focal lengths, whereas a prime lens is at a constant, fixed focal length. The 30mm in my sig is a prime lens.
so prime being 30mm NOT 15- 30mm (example)
 
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post #46 of 69
Quote:
Originally Posted by sotorious View Post
so prime being 30mm NOT 15- 30mm (example)
Yeaup.
post #47 of 69
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Quote:
Originally Posted by r31ncarnat3d View Post
Yeaup.
ok because every time i heard prime i felt like you were saying you need to get a good lens!

Also the higher the aperture number does that mean it can do better in lower lighting.
Edited by sotorious - 5/7/11 at 12:14pm
 
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post #48 of 69
Quote:
Originally Posted by sotorious View Post
ok because every time i heard prime i felt like you were saying you need to get a good lens!

Also the higher the aperture number does that mean it can do better in lower lighting.
Nope; larger aperture = smaller f-stop number = better low light performance.

f/1.8, for example, is much larger than f/2.8, which is much larger than f/8.
post #49 of 69
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Quote:
Originally Posted by r31ncarnat3d View Post
Nope; larger aperture = smaller f-stop number = better low light performance.

f/1.8, for example, is much larger than f/2.8, which is much larger than f/8.
I thought the f/1.8 or whatever was the way to read the aperture
 
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post #50 of 69
Quote:
Originally Posted by sotorious View Post
I thought the f/1.8 or whatever was the way to read the aperture
It is; I don't know how my post could have suggested otherwise.

I was just replying to how it seemed in your quoted post, you said larger f-stop number = better low light performance, which isn't at all true. A larger aperture will give you better low light, and larger apertures correspond to smaller f-stops. f/1.8, as stated, will have a larger aperture than f/8.
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