First Shot with 70-200 F4-L

Discussion in 'General Gallery' started by rp1600, Mar 26, 2007.

  1. rp1600

    rp1600 TPF Noob!

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    Just looking for general critique on this photo, the first shot I took with my 70-200mm L. It's hard to imagine the difference in optic quality until you've shot with this thing. Anyway, thanks for looking.
    Ron.

    [​IMG]
     
  2. Sw1tchFX

    Sw1tchFX TPF Noob!

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    It's a good shot, but it's impossible to see the quality with a resized image.
     
  3. mattman3680

    mattman3680 TPF Noob!

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    switch... if the resizing takes much of the quality out then how can you make the pic with original quality but smaller?

    Thanks,

    Matt
     
  4. miltphoto

    miltphoto TPF Noob!

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    I have the same lens, look at the colors, they are very good and sharp. I think cannons L lens are the best I also have a 24-70L.:hail:
     
  5. Alex_B

    Alex_B No longer a newbie, moving up!

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    you cannot. simple answer ;)

    actually resizing does not reduce "the quality" of the picture, but it makes it impossible to judge the resolution and sharpness of the lens.
    If you want to technically demonstrate the latter, post the image resized, and in addition post a crop of a small area of the image, which you do not resize but give in full resolution. Would be wise to chose an area which is in focus ;)
     
  6. ashleysmithd

    ashleysmithd TPF Noob!

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    It still gives a rough idea of the lens contrast.

    I always go for contrast over resolution.
     
  7. LaFoto

    LaFoto Just Corinna in real life Staff Member Supporting Member

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    Dang!
    Again this Alex was faster.

    I was going to say the very same.

    But if you want to give him a print (and he will appreciate one, I am sure) you will see how good your lens is, for even though this downsized version has lost some of its original quality, I can still appreciate the sharpness of the person, the blurriness of the background, the luminosity of the colours ... I can see all that.

    But what was your ISO setting?
    This photo looks noisy.
    Nothing that NeatImage couldn't solve, though...
     
  8. Alex_B

    Alex_B No longer a newbie, moving up!

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    but contrast you can push in post-processing, resolution not that easily though.

    good glass often gives both though... fortunately.
     
  9. ashleysmithd

    ashleysmithd TPF Noob!

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    At the expense of more noise... (maybe I'm just paranoid but I hate doing any major post-grading now)

    Well I have no idea what the MTF ratings for sigma lenses are, but that looks like one contrasty image... unless it has had any post-grading (which would explain the noise) I'd probably go with it being a relatively low resolution lens. (in comparison)

    But hey, I'm no pro.. so I may be mistaken somewhere here.
     
  10. MrMatthieu

    MrMatthieu TPF Noob!

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    Sorry I am completly amazed by all these comments which are really meaningless to me.

    I have never see that resolution/contrast are some of the most critical parameter of the good quality lens ( I am not talking about USSR lens :D )

    To my opinion what makes the quality of a lens is :

    1/ The range
    2/ The luminosity of the lens, 4 constant is really very very good
    3/ The low distortion
    4/ The low chromatic aberation

    All the other parameters are not linked to lens but to digital sensor of the camera. Maybe I have wrong idea but that s my opinion ;)

    To come back to your picture even if it is croped and low resolution, a good picture remains a good picture. I can show you professionnal website where pictures of 100k look with very good quality, that s not the case in your picture and it is not due to the lens.

    SO keep trying you will do better next time because you have a good lense no doubt about it.

    Mat
     
  11. ashleysmithd

    ashleysmithd TPF Noob!

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    Those are without a doubt key measurements of a lenses quality, but one factor that I'm interested in is it's resolution/contrast. The more the resolution, the more contrast, and vice versa. I go for contrast.

    However the poor quality lenses don't have either.

    For instance Zeiss have always gone for resolution. Cooke for contrast.
     
  12. Alex_B

    Alex_B No longer a newbie, moving up!

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    If you would display the image data as it comes from the sensor, that would always have very little contrast and look extremely flat. It is only in the RAW conversion process (done in camera or in external software) that you get the contrast you see in the image.

    The variation in contrast which comes from having different lenses is not of the same order of magnitude as this contrast push which is done in RAW conversion, hence it does not really induce much more noise than already there.

    Of course if you push it beyond limits it will become visible.

    I might be biased here though, as I have a low-noise sensor anyway.
     

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