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Lets talk lenses!

This is a discussion on Lets talk lenses! within the Technical Photography Discussion forums, part of the Orchid Photography category; Originally Posted by Shannara I got my new lense(Tamron AF 90mm f/2.8 Di )! I ...

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  1. #11
    Bikerdoc5968 is offline Senior Member
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    Quote Originally Posted by Shannara View Post
    I got my new lense(Tamron AF 90mm f/2.8 Di )! I am still trying to figure out how to widen my focus area but for now here are a couple shots.

    Saw this on a weed in the yard:




    One of my cats:



    Caught her with her tongue out!

    Shann~

    When you speak of "widening the focus area" it can only be done by increasing the distance to object. Since I will assume this Tamron is a macro lens. That is what I was saying about my Sigma; it comes in a 70mm and 105mm. The 70mm will have a wider "focus area"

  2. #12
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    I thought you widened your focus area via the aperture setting?

    Shann~

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    Bikerdoc5968 is offline Senior Member
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    Aperture setting or f~ stop change the exposure and the depth of field. The larger the f ~ stop, i.e., f 22 the greater the depth of field. You may know this already, but depth of field is the distance in front of and behind the central focused object that will be a sharp image. Let's say the object is 5' from the film plane and the lighting is such that a correct exposure would be f 22 @ 1/80 sec. but the backgound is busy and distracting from the object. If you change the f stop to f 5.6, 4 f stops, and change the shutter speed to 1/250th, the resulting exposure should be pretty close and your depth of field will have decreased so the background is no longer clearly visable, but the object is....

    The issue you were originally addressing deals with "what can I see through the lens". The longer the focal length the narrower the viewing area or angle of acceptance at a specified distance.

  4. #14
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    Aperture setting or f~ stop change the exposure and the depth of field. The larger the f ~ stop, i.e., f 22 the greater the depth of field. You may know this already, but depth of field is the distance in front of and behind the central focused object that will be a sharp image. Let's say the object is 5' from the film plane and the lighting is such that a correct exposure would be f 22 @ 1/80 sec. but the backgound is busy and distracting from the object. If you change the f stop to f 5.6, 4 f stops, and change the shutter speed to 1/250th, the resulting exposure should be pretty close and your depth of field will have decreased so the background is no longer clearly visable, but the object is....

    The issue you were originally addressing deals with "what can I see through the lens". The longer the focal length the narrower the viewing area or angle of acceptance at a specified distance.
    Hey, thanks for sharing the info. I was trying to get my depth of field control better so I could bring more of background into focus and successfully worked that out today. I played around with my aperture and shutter settings in manual mode.

    This was at f 3.5:



    This was at f 22:




    Despite the mosquitoes swarming I got a few neat bug shots earlier:

    Cute ladybug:







    Caught her cleaning her leg:



    I swear this ant was studying me and much as I was him:





    Any tips to help me improve my photography skills are welcome!

    Shann~

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    Bikerdoc5968 is offline Senior Member
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    Just be careful because you don't want to have the point of interest lost in a busy background or forground....

  6. #16
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    Hi Shannara,

    I am using a Nikon F70 (can't afford the newer FX models....sigh....) with a sigma 105mm f2.8 macro lens. The lens has produced some nice photos for me. Anyways, you might want to try mounting an extension tube for more stunning effects. Am also using the nikon pn11 sometimes. Also thought of reverse mounting my wide angle lens....that is another story altogether.....happy shooting!!!!

  7. #17
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    Hi Shannara,

    I am using a Nikon F70 (can't afford the newer FX models....sigh....) with a sigma 105mm f2.8 macro lens. The lens has produced some nice photos for me. Anyways, you might want to try mounting an extension tube for more stunning effects. Am also using the nikon pn11 sometimes. Also thought of reverse mounting my wide angle lens....that is another story altogether.....happy shooting!!!!
    Thanks for the tip. If you want....post some photos and tell us what lenses you used!

    Shann~

  8. #18
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    hi.

    some of these pics were taken with the extension tube and most of taken with the aid of the tripod. please forgive pic quality as they were scanned into the computer from the prints. critique welcomed.

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    cheers.

  9. #19
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    I love the first and second ones, sushiboy. All are very dynamic. Great photography!

    Cheers,
    BD

  10. #20
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    hi.

    some of these pics were taken with the extension tube and most of taken with the aid of the tripod. please forgive pic quality as they were scanned into the computer from the prints. critique welcomed.
    I like the water droplets and texture on leaves! I caught some droplets today when I found another ladybug...and then what looks like a stinkbug!





    Shann~

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