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post #31 of 69
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Also is that tamron AF is a fast lens.
 
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post #32 of 69
f/2.8 is fast for a zoom lens, but if you want to go prime you will get even faster lenses. Primes usually are f/1.4-f/1.8.
post #33 of 69
Quote:
Originally Posted by sotorious View Post
now whats the difference between a diffuser and a regular flash? and if i did get flash it would be with that bounce trick correct? with the flash facing up.
a diffuser is a medium you place infront of the flash so that the light isnt has "hard", think bare light bulb vs a lamp with a light shade.

you do not need to bounce the flash, but generally you would want to. because if you just point the flash at the subject and shoot it just ends up being the same as your on camera flash. bouncing the flash basically uses the ceiling as a giant diffuser so that you can get softer light.

you cant really bounce a flash if you are in a large hall because halls are generally too high to get enough light bouncing back.

Quote:
Originally Posted by sotorious View Post
Also is that tamron AF is a fast lens.
its "fast" as in it does have a 2.8 aperture. its autofocus speed on the other hand could be considered a bit sluggish....
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post #34 of 69
Thread Starter 
Ok cool, and from what i read in your guide it says the longer the eye stays open or aperture, the better picture you can get in the dark basically. so with a faster lens i wouldn't have to leave it open as much, or as long?.


Also a cheap off brand flash would be nice i dont need the best flash.
Edited by sotorious - 5/5/11 at 6:41am
 
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post #35 of 69
Thread Starter 
Where is the specs do i look for it to be fast? i cant see it in the specs where it says aperture numbers.

Also those bigggg white lenses are those fast? the ones that are anywhere from 2k to 10k and above.
 
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post #36 of 69
Quote:
Originally Posted by sotorious View Post
Where is the specs do i look for it to be fast? i cant see it in the specs where it says aperture numbers.

Also those bigggg white lenses are those fast? the ones that are anywhere from 2k to 10k and above.
They're in the name itself. Take for example, the kit lens:

Canon EF-S 18-55mm f/3.5-5.6 IS

f/3.5-5.6 is the maximum aperture. This means that the aperture will change at different focal lengths, with the maximum aperture being f/3.5 at the wider focal lengths and f/5.6 at the narrower focal lengths, with the aperture being in between at the middle focal lengths. This is standard for a zoom lens.

Now another lens:

Canon EF-S 17-55mm f/2.8 IS USM

f/2.8 is the maximum aperture here. This means that there's a constant f/2.8 aperture regardless of the focal length used for this lens. f/2.8 is considered fast for a zoom lens, especially at the telephoto focal lengths.

Now another:

Canon EF 50mm f/1.8

f/1.8 is the maximum aperture here. Unlike the other two, this is a prime lens, not a zoom lens. As a whole, prime lenses usually are faster than their zoom counterparts. So even though f/2.8 is considered fast for a zoom lens, it's normal to see prime lenses at f/1.8 or f/2, with some going to f/1.4 or even f/1.2.



As for those "white" telephoto lenses you mentioned, that's Canon's L-series telephoto. L-series lenses have full weather sealing (except for the 70-200 non-IS models), superior optics, and are very fast lenses. With those telephoto lenses, you can find stuff like 70-200 f/2.8, or even a 300mm f/2.8 lens.

However, if you're thinking about buying those lenses, I'd think carefully about it first. I'm not trying to sound like a jerk, but these questions are all things an experienced photographer should already know, and it's the experienced photographer that would get the most out of those white lenses. Without the proper know-how to handle L-lenses, there's probably not going to be a difference between them or a normal telephoto lens like the much cheaper 55-250mm.
post #37 of 69
Thread Starter 
oo ok thanks i was just seeing, well i also figure it this way, which ever lens i get its going to be better then the lens that also came with it.
 
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post #38 of 69
Quote:
Originally Posted by sotorious View Post
oo ok thanks i was just seeing, well i also figure it this way, which ever lens i get its going to be better then the lens that also came with it.
The maximum aperture is just one part of the lens. The focal length is also very important. The 70-200 f/2.8 for example has great optics, but I'd take the kit 18-55mm IS lens over it because the 18-55mm is a much better focal length to work with for my photography.

And honestly, the 18-55mm IS is a hell of a lens, especially for a beginner. You'd either have to go prime (losing the convenience of a zoom) or with a 17-55mm ($1000 lens) to get better quality optics at those focal lengths.

Again, I'd heavily suggest you focus on the photography itself and gain some experience before you invest in equipment. At this point, it's very likely that your photography is skill-limited, not gear-limited (and again I'm sorry if I'm coming off as a jerk).
post #39 of 69
Thread Starter 
Understand what your saying but in my collection i would like to have a decent zoom lens and a decent macro lens. Just trying to get a well understanding on all of this. now the 18-55mm is basically the zoom length correct? and what if you go beyond the aperture of the lens will it just not register or will photos come out crazy?

i have the canon t1i rebel and i think it has a Canon EF-S 18-55mm
 
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post #40 of 69
Quote:
Originally Posted by sotorious View Post
Understand what your saying but in my collection i would like to have a decent zoom lens and a decent macro lens. Just trying to get a well understanding on all of this. now the 18-55mm is basically the zoom length correct? and what if you go beyond the aperture of the lens will it just not register or will photos come out crazy?
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.
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