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  1. #1
    Senior Member
    dannyjah's Avatar

    What is a 1.2 lens

    Nikon D3100 14.2MP Digital SLR Camera with 18-55mm f/3.5-5.6 AF-S DX VR Nikkor Zoom Lens my camera type ... I`,m noob @ photography

    I saw a picture with the images blur in the background and want to know what kinda lens i would need for this type of effects


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    Last edited by Browncoat; 03-19-2011 at 12:57 AM. Reason: Protected image



  2. #2
    Member

    Re: What is a 1.2 lens

    I'm new to this too, but 1.2 is the aperture size ... it's the max aperture that you can open up to with that lens. I'm hoping I stated that correctly, if not someone here will chime in and correct me and probably explain a little more in depth.

    However you can get the blur effect with the lens you have. I have the same camera and lens and have gotten that effect. You have to adjust your aperture size (the f number) to a large number. It's called shallow depth of field. That will keep your subject in focus and blur the background. You may want to experiment with the aperture priority mode on the camera and try it. It's the A mode on the top dial. Here's a photo I took of my son with that effect.



    My aperture was set at f/5.6 for this one. With that lens, you'll notice in the description it says 3.5 - 5.6. That means the max aperture is different depending on your focal length. If you are shooting something at 18mm, you can open up all the way to 3.5 and it decreases from there ... at 55mm you can only open up to 5.6.

    Here's a link to an article that explains aperture a little more. It's a really good site for learning, it's helped me quite a bit.

    Introduction to Aperture in Digital Photography

  3. #3
    Senior Member
    Joseph Bautsch's Avatar

    Re: What is a 1.2 lens

    The effect you are referring to is called bokeh. The subject is in focus and the background is out of focus to varying degrees. You achieve the effect by controlling your depth of field. As ChrisM states you can achieve this by using a smaller number f/stop, as on your lens f/3.5 or even at f/5.6 depending on shooting conditions. But there is more to controlling bokeh, depth of field, than tossing in a small f/stop number. If you go to the blog section of this site and look up Depth of Field Primer Part I and Part II you will find a detailed explanation of depth of field, what it is and how to use it. Hope this helps.
    Happy shooting,
    Joseph

    William Faulkner: "Don't bother just to be better than your contemporaries or predecessors. Try to be better than yourself."
    Jonathan Swift: "You can't make a Silk Purse out of a Sow's Ear." (Especially if you think you can fix it in post processing.)

  4. #4
    Senior Member
    theregsy's Avatar

    Re: What is a 1.2 lens

    As the question has been answered professionally and very knowledgeably, an F1.2 lens is also usually expensive LOL sorry.
    Yeah the Bokeh (or blur) adds a lot to a portrait or nice flower photo, but it isn't just as easy as buying a fast lens (fast = bigger aperture, resulting in a faster shutter speed, corrections please) if you over do it, say you have a nice flower that you want to get sharp with the nice background blur, if you go to open on the aperture you could find that you have only a very small part actually in focus, like the very tips of the petals or something. Good luck, enjoy the primers above they helped me
    Likes dannyjah liked this post
     
    THE man in black. www.theregsy.co.uk - www.cumbriafestivals.co.uk - Facebook - www.markregan.co.uk
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  5. #5
    Member

    Re: What is a 1.2 lens

    Quote Originally Posted by Joseph Bautsch View Post
    The effect you are referring to is called bokeh. The subject is in focus and the background is out of focus to varying degrees. You achieve the effect by controlling your depth of field. As ChrisM states you can achieve this by using a smaller number f/stop, as on your lens f/3.5 or even at f/5.6 depending on shooting conditions. But there is more to controlling bokeh, depth of field, than tossing in a small f/stop number. If you go to the blog section of this site and look up Depth of Field Primer Part I and Part II you will find a detailed explanation of depth of field, what it is and how to use it. Hope this helps.
    Thanks for posting this!! No one has ever explained all that to me before, this helps tremendously!

  6. #6
    Aims to Misbehave
    Browncoat's Avatar

    Re: What is a 1.2 lens

    Image removed. In the future, please give photo credit to images posted that do not belong to you. Downloading and redistributing images from the internet isn't a practice we want to promote.
    "I used to care what others thought about me. Then, one day, I tried to pay my bills with their opinions." - Unknown

  7. #7
    Senior Member
    dannyjah's Avatar

    Re: What is a 1.2 lens

    Thank you Chris

  8. #8
    Senior Member
    dannyjah's Avatar

    Re: What is a 1.2 lens

    Thank you both for the info
    Joseph Bautsch
    Theregsy





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