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Thread: Is my lens ok?

  1. #1

    Default Is my lens ok?

    hello, just got the tamron 28-75 f2.8 today... still very inexperienced, so hoping anyone can help to see whether my copy is ok... or rather, performing as expected..

    here are reviews im judging my lens upon..

    photozone:
    http://www.photozone.de/8Reviews/len...ikon/index.htm

    bob atkins:
    http://www.bobatkins.com/photography...on_28_75b.html


    100% centre crops (focus point just above the white oval sticker):

    28mm f2.8, 28mm f4




    28mm f5.6, 28mm f8




    this lens known to be softer @ 28mm wide open, but by f4 supposed to sharpen a lot..


    50mm f2.8, 50mm f4




    75mm f2.8, 75mm f4




    similarly for 50mm & 75mm, sharpness supposed to improve from f2.8 to f4 (though not so drastic)..

    erm.. so is my lens' sharpness to par? or is there something wrong?

  2. #2

    Default Re: Is my lens ok?

    100% corner crops of newspaper shots:

    28mm f2.8





    50mm f2.8


    Last edited by skopio; 16th January 2007 at 10:15 PM.

  3. #3
    Senior Member Pablo's Avatar
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    Default Re: Is my lens ok?

    I think you are expecting the worst.

    You hare hoping for justification of your purchase.

    You have a GOOD lens. Go out and use it for what you can get from you and it.

    Come back with some REAL photo's.

    Cheers
    Time, is an effortless construction :)

  4. #4

    Default Re: Is my lens ok?

    75mm f2.8





    would it be correct for me to say that chromatic abberation is usually at its worst wide open ?(meaning f2.8)
    so if this is ok, that means most probably when i stop down it should improve?

  5. #5

    Default Re: Is my lens ok?

    I would say it looks pretty respectable to me. Before you test for sharpness, you should test for front/back-focusing first, as this may be the cause of any blur.

  6. #6

    Default Re: Is my lens ok?

    Quote Originally Posted by Pablo View Post
    I think you are expecting the worst.

    You hare hoping for justification of your purchase.

    You have a GOOD lens. Go out and use it for what you can get from you and it.

    Come back with some REAL photo's.

    Cheers
    i'm not exactly expecting the worse.. i'm not sure how to evaluate the lens.. so im wondering whether i got a decent copy..
    if quality is under par, then i guess i'll have to send it back..
    if it's fine, then i'm more than glad to keep it..


    Quote Originally Posted by kayheem View Post
    I would say it looks pretty respectable to me. Before you test for sharpness, you should test for front/back-focusing first, as this may be the cause of any blur.
    checked already.. that's one of the first things i checked at the shop..
    Last edited by skopio; 16th January 2007 at 10:19 PM.

  7. #7
    Senior Member Kit's Avatar
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    Default Re: Is my lens ok?

    What is performing as expected?? If you've bought a lens specially to take photos of a bottle of correction fluid then yah, I think its performing as expected. You got pictures of a bottle of correction fluid.......

  8. #8
    Senior Member Kit's Avatar
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    Default Re: Is my lens ok?

    and btw, you usually admire your photos at 100%??

  9. #9

    Default Re: Is my lens ok?

    Quote Originally Posted by Kit View Post
    What is performing as expected?? If you've bought a lens specially to take photos of a bottle of correction fluid then yah, I think its performing as expected. You got pictures of a bottle of correction fluid.......
    erm.. there's nothing interesting in my house? and i just wanted to check the lens, that's all.. sorry if i upset u..

  10. #10
    Senior Member Kit's Avatar
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    Default Re: Is my lens ok?

    Quote Originally Posted by skopio View Post
    erm.. there's nothing interesting in my house? and i just wanted to check the lens, that's all.. sorry if i upset u..
    Try getting out of your house? It doesn't upset me at all. Just don't know if people nowadays buy lenses for testing or for taking photos.....

  11. #11
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    Default Re: Is my lens ok?

    Hi skipio,
    Your lens is a sharp copy. I could not see the chromatic abberation ..What pablo meant you should go and shoot and find problem mah.Test shoot tell you everything but yet nothing..Don't just rely on the test to evaluate your lens..You try to shoot with your lens first then tell us any problem with image..Nah..I am not an expert ah..but can trust me on the abberation because I worked on lenses before ( not lense for light but it's magnetic lens..)
    A person is useless unless he is standing up for himself, for his future, and for his dreams.

  12. #12

    Default Re: Is my lens ok?

    Quote Originally Posted by standingup View Post
    Hi skipio,
    Your lens is a sharp copy. I could not see the chromatic abberation ..What paplo meant you should go and shoot and find problem mah.Test shoot tell you everything but yet nothing..Don't just rely on the test to evaluate your lens..You try to shoot with your lens first then tell us any problem with image..Nah..I am not an expert ah..but can trust me on the abberation because I worked on lenses before ( not lense for light but it's magnetic lens..)
    thanks for your reply!

    yea, will be going to shoot in a couple of days (schooling).. just that i got it today, so want test the lens today..

    erm.. another reason why i seem very kanchiong to check my lens is because its more than a year's worth of my savings...
    Last edited by skopio; 16th January 2007 at 10:30 PM.

  13. #13
    Senior Member
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    Default Re: Is my lens ok?

    Don't worry. Everything looks fine. Now go out and shoot with it. You'll love that lens.
    Canon 80D|Panasonic LX3/LX5
    35f2 IS|50f1.8|85f1.8|12-24f4|18-135f4-5.6 IS|28-75f2.8

  14. #14

    Default Re: Is my lens ok?

    this lens is simply a keeper.
    You'll love it.

  15. #15

    Default Re: Is my lens ok?

    thanks kelccm and newmemberz.. i want it to be a keeper too!

  16. #16
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    Default Re: Is my lens ok?

    for a center crops, thats very good. yes no doubt a little soft at f2.8 like what most review have wrote, but it is more than enough for even big print.

  17. #17
    Senior Member dominator's Avatar
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    Default Re: Is my lens ok?

    You bought it at TK?

  18. #18

    Default Re: Is my lens ok?

    Not sure if increasing the ISO would help if you want to take at F2.8?

  19. #19

    Default Re: Is my lens ok?

    Looks fine to me. Any reason why you have any doubts after the purchase? My suggestion is to just go ahead and enjoy your lens.

  20. #20

    Default Re: Is my lens ok?

    Quote Originally Posted by dominator View Post
    You bought it at TK?
    nope. why leh? is TK cheaper?

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