Still using Tamron ALL 18 270 mm... whats wrong with me... i bought

Discussion in 'Photography Beginners' Forum' started by Photo Lady, Feb 28, 2016.

  1. Photo Lady

    Photo Lady Been spending a lot of time on here!

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    another Tamron lens Sp 70-300mm F/4 -5.6 and it drives me crazy to get a decent clear in focus photo........ i do not mind doing it manually.. but it just seems like i spend so much time trying to focus that it takes out the joy of using that lens...The tamron all in one my photos are very decent..... at least in my opinion .. is there something wrong with my new lens...? I have the D7100 Nikon..ANYONE else experiencing this disappointment...... i am sure i could have spent the money better....... here is a today photo of my lens tamron all in one 18-270mm which i primarily use everyday for work..this photo is my 11 month old dobie puppy.. I will take one using the Sp 70-300mm F/4 -5.6 for comparison in next post .....thanks for any help my guys 002.JPG


     

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  2. Photo Lady

    Photo Lady Been spending a lot of time on here!

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    here is a photo of him using the Tamron 70-300
     
  3. Photo Lady

    Photo Lady Been spending a lot of time on here!

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    here is a photo of him using the Tamron 70-300 new lens 041.JPG
     
  4. Dao

    Dao No longer a newbie, moving up!

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    The 70-300mm lens seems to be pretty sharp and good. The issue you have is related to Depth of Field (DoF).

    Take a look at here

    Online Depth of Field Calculator
     
  5. Photo Lady

    Photo Lady Been spending a lot of time on here!

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    wow thanks for this information.. i do not fully understand it so i am looking forward to doing this.......... xoxo thank again
     
  6. Photo Lady

    Photo Lady Been spending a lot of time on here!

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    is this the formula for a Nikon d7100
     
  7. Photo Lady

    Photo Lady Been spending a lot of time on here!

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    oh i see theres a drop down menu.. but weird i do not see the Nikon d7100
     
  8. Photo Lady

    Photo Lady Been spending a lot of time on here!

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    i think i am getting it...... what do you think? I had to crop it so much so it would upload so excuse the ears.
     

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  9. weepete

    weepete TPF Supporters Supporting Member

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    Looks sharp enough to me!
     
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  10. astroNikon

    astroNikon 'ya all Bananas I tell 'ya Supporting Member

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    For the calculator use the Nikon d7000 (it has others listed there too). What it is is a "1.6x" crop factor sensor.

    here's more about DOF ==>Understanding Depth of Field in Photography
    and a different calculator ==> A Flexible Depth of Field Calculator

    But essentially you are TOO CLOSE for proper DOF.
    If you are focusing on the eyes, they the nose, as you can see, is out of focus.
    If you were to go to f/8 or f/11 then the nose would be more in focus with the DOF. If you were to take more steps back away from the dog and that would also increase your DOF mathematically without changing the aperture. You can play around with the "Focus Distance" from the subject.
     
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  11. Photo Lady

    Photo Lady Been spending a lot of time on here!

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  12. Photo Lady

    Photo Lady Been spending a lot of time on here!

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