18-55?

Discussion in 'Photography Beginners' Forum' started by Karla_atx, May 9, 2008.

  1. Karla_atx

    Karla_atx TPF Noob!

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    i believe the lens that came with my XTI is 18-55mm so i was wondering what would be the best lens to buy im not looking to spend big money for it since im still very new to photography .

    Another question im having a hard time understanding the AV mode , i read somewhere that my lens isnt so good for that mode is this true?
     
  2. Mav

    Mav TPF Noob!

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  3. JimmyO

    JimmyO TPF Noob!

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    Do are you intrested in any particular type of photography?

    Do you have a budget?
     
  4. TamiyaGuy

    TamiyaGuy No longer a newbie, moving up!

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    A longer range telephoto is always a handy addition to your kitbag, for example a cheap 55-200mm lens or 70-200/70-300 (like THIS or THIS. You could also get other brand lenses like Sigma or Tamron that are cheaper at the cost of a tiny loss of quality [like THIS or THIS in a Canon fit]). This will allow you to shoot most wildlife or sports, or just for general times when you need that little extra bit of reach. It's also worth getting the very cheap 50mm F/1.8 lens. This kind of lens is perfect for portraits and places where you need a VERY shallow depth of field (explained later).

    The person who told you the 18-55 kit lens is bad for AV (or Aperture Priority mode) is wrong, but the lens could be better. Your lens always comes with an "F-number" after the lens length, which can range from F/1.2 to F/6.3, or a range of these numbers (e.g. F/2-4) I think your lens is F/3.5-5.6.

    This number is the aperture of your lens, and it performs 3 functions:

    It allows light to pass through your camera onto your sensor
    Basically, an aperture is a hole in your lens :D

    (now for the important parts)

    It is variable and can regulate the shutter speed
    What this means is that depending on camera settings, the hole can get larger or smaller, regulating the amount of light getting let in. A larger aperture (or SMALLER f-number) lets more light in, whereas a smaller aperture (or a LARGER f-number) lets less light in. This means that a larger aperture needs a faster shutter speed to create a "proper" exposure and vice versa for smaller apertures.

    It also regulates the Depth Of Field (DOF)
    The depth of field is how much of your photograph is in focus, and how much a subject "pops out" in a photo. A larger aperture (smaller f-no.) gives a more shallow depth of field suitable for portraits, whereas a smaller aperture (remember? ;)) gives a larger depth of field suitable for landscape photos etc.


    As with most things in photography, aperture settings are a compromise. If you're shooting sports, you'll need to sacrifice depth of field in order to get a faster shutter speed, and if you're shooting something where you want everything to be in focus, you'll need to sacrifice shutter speed. Also, while we're on the subject of compromises, a lens doesn't perform at its best at very large or small apertures (e.g. F/5.6 or F/22); it performs best (and the photos are sharpest) in mid-range apertures like F/7-F/16. However, this shouldn't worry you too much, as it only makes a small difference on your kit (no offence :))


    Now, as to why that guy said your lens is bad for aperture priority. Your lens has a rather small maximum aperture compared to some of the professional lenses (like this one [Yeah, yeah, it's 17-55, whatever :greenpbl:]). At 55mm, your lens has a maximum aperture of F/5.6, whereas a pro 18-55 lens would have a maximum aperture of F/2.8. This, of course, means that the pro lens would be able to make a subject "stand out" more than your 18-55 could. However, your 18-55 can still give a rather shallow DOF, so you really shouldn't worry; your 18-55 is just fine for aperture priority mode.


    Well, I think that's apertures covered. If you've got any more questions, I'll try to reply as soon as possible (or another person might). Bye! :D

    ~TamiyaGuy
     
  5. dslrchat

    dslrchat TPF Noob!

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    Thank you for that post, very informative!
     
  6. asfixiate

    asfixiate TPF Noob!

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    28-135 f/3.5 IS is decent walk around and of course

    50mm f/1.8
     
  7. abraxas

    abraxas No longer a newbie, moving up!

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    I'd think that rather than spend money at this point it's time to do a few things.

    First, get out and take some pictures.

    Second, read about AV mode, then get out and learn about it by taking pictures.

    Third, get out and take some pictures and learn if you need to get closer (longer) or further (a wider angle) from your subject. How does the 18-55 fall short for you?

    Read and practice with what you have, the answers will come much easier, and cheaper.
     
  8. TamiyaGuy

    TamiyaGuy No longer a newbie, moving up!

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    No problem! I just hope it wasn't too daunting for you or too "for dummies" style :mrgreen:
     
  9. asfixiate

    asfixiate TPF Noob!

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    or you can always buy a decent flash as well. Flash photography has made my otherwise less useful(don't want to say useless) in night lenses very useful.
     
  10. dslrchat

    dslrchat TPF Noob!

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    But thats what I need. :D
     
  11. Karla_atx

    Karla_atx TPF Noob!

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    wow thank you so much this was very helpfull :hail:
     
  12. Socrates

    Socrates TPF Noob!

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