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Thread: Difficult to get sharp images

  1. #1

    Default Difficult to get sharp images

    I am still learning and own a 60D with tamron 18-200mm lens
    During day shots , i m still quite comfortable. Normalli using AV mode, 6.5/ISO100-200
    My problems lies in

    1) when i zoom out to >100mm..sometime when images are viewed on pc, they do not look as sharp.

    2) For flower macro shots, i know this is a zoom lens, max at 200mm, the bokeh is blur at 3.5 while dun know somehow feel the center of e flower is nt v sharp.

    3) Any recommended settings / modes to shoot portrait pics? Thank!!!

    Bros out there, any guidances on this? or rather is this the limitation of this tamron lens?

    I also wanna find a lens to shoot portrait photos with sharp foreground with nice bokeh. Any suggestions on which low range model? between $300-500?

    Thank for reading and help

  2. #2

    Default Re: Difficult to get sharp images

    1) The rule of thumb for shutter speed is 1/focal length, but many other factors also play a part too.

    2) Have you gone beyond the min. focusing distance ?

    3) There is no standard rule, its up to you to decide what mood you want to create.

    A cheap 50mm f1.8 will be a good start.
    7D | 17-50 f2.8 | 30 f1.4 | 70-200L | flickr

  3. #3

    Default Re: Difficult to get sharp images

    You need to understand your gear more. You got an 18-200, which is a lens full of compromises. In exchange for such a large range in focal length, you lose some image quality.

    1. You should try to set your aperture to f/8.
    2. You cannot have f/3.5 at 200mm with that lens, largest is f/5.6 if my memory is right. Also, the bokeh cannot be blur. I think what you are trying to say is that the background is blurred. Again, try to set your aperture to f/8
    3. Same basic principles... Set the right aperture for your shot and focal length that you need.

    For a cheap pertrait lens, get a 50mm f/1.8 - very cheap but not bad.
    Alpha

  4. #4

    Default Re: Difficult to get sharp images

    I have the same issue with some tamron lenses but thats only in low light settings, i don't think it's an issue of you being too close to the object, maybe you might wanna try setting a higher apperture, usually F8 makes just about everything sharp.

  5. #5
    Senior Member Diavonex's Avatar
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    Default Re: Difficult to get sharp images

    You must use the right focusing mode to get the center of flower in focus.

    Try using Center Focusing or Spot Focusing to lock onto the center of the flower.

  6. #6
    Senior Member sinned79's Avatar
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    Default Re: Difficult to get sharp images

    post your photo

  7. #7

    Default Re: Difficult to get sharp images

    Best to try different combination of settings. Start from the extremes.
    Preferably shoot using a stand to eliminate the hand shake variable.
    You should finally get settings that will give you the best the
    lens can deliver. If you need more than that, you will
    have to consider calibration or a better lens.

    _____________________________
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  8. #8

    Default Re: Difficult to get sharp images

    could be handshake as well. do a search on that, there are some posts on that matter.
    cuiusvis hominis est errare, nullius nisi insipientis in errore perseverare

  9. #9

    Default Re: Difficult to get sharp images

    if you are wearing spec, make sure that you do the same when focussing, else you hv to experiment with the diopter slidebar at the viewfinder

  10. #10

    Default Re: Difficult to get sharp images

    Quote Originally Posted by Diavonex View Post
    You must use the right focusing mode to get the center of flower in focus.

    Try using Center Focusing or Spot Focusing to lock onto the center of the flower.


    something like below pic?


  11. #11
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    Default Re: Difficult to get sharp images

    I used to have the Tamron 18-200 and it isn't the sharpest lens to begin with. I felt that even my kit lens from my old 300D (the 1st EFS 18-55) was sharper.
    Also, there's no IS so my long tele shots were often blur from camera shake.

    I need good lighting to get a good sharp picture with that lens hand held. Or use a flash.
    5DMk2/RT/430EXII/EF 24-105LIS/EF70-200f4LIS/Nex5N/18-200SEL

  12. #12

    Default Re: Difficult to get sharp images

    You will need to adjust your ISO depending on the lighting situation in order to get a decent shutter speed.

  13. #13

    Default Re: Difficult to get sharp images

    Thank for your replies ppl.

    1) The 50mm 1.8...what brand is good and cheap to start with? What is the $$$ range for a new & 2nd hand one? Any idea?
    It is mentioned that is for portrait, if i use for flowers. I believe will have nicer bokeh and sharper image?

    2) Thank. I'll try with f/8 from now.

    3) The right focusing mode and adjusting the is cicular slidebar above e viewbar are something i should consider too Thank

    4) What are some zoom lenses that come with IS are in use now?

    Thank for reading and comments.

  14. #14

    Default

    Quote Originally Posted by Anthony82
    Thank for your replies ppl.

    1) The 50mm 1.8...what brand is good and cheap to start with? What is the $$$ range for a new & 2nd hand one? Any idea?
    It is mentioned that is for portrait, if i use for flowers. I believe will have nicer bokeh and sharper image?

    2) Thank. I'll try with f/8 from now.

    3) The right focusing mode and adjusting the is cicular slidebar above e viewbar are something i should consider too Thank

    4) What are some zoom lenses that come with IS are in use now?

    Thank for reading and comments.
    You are in luck, Canon makes the cheapest 50mm f1.8 on the market. For the zoom lenses with IS, there are to many to name, check the price list, all the lenses are listed there. IS for Canon, VR for Nikon, VC for Tamron and OS for Sigma

  15. #15

    Default Re: Difficult to get sharp images

    Quote Originally Posted by Anthony82 View Post
    Thank for your replies ppl.

    1) The 50mm 1.8...what brand is good and cheap to start with? What is the $$$ range for a new & 2nd hand one? Any idea?
    It is mentioned that is for portrait, if i use for flowers. I believe will have nicer bokeh and sharper image?

    2) Thank. I'll try with f/8 from now.

    3) The right focusing mode and adjusting the is cicular slidebar above e viewbar are something i should consider too Thank

    4) What are some zoom lenses that come with IS are in use now?

    Thank for reading and comments.
    Before jumping at new lenses you can try to master your existing setup. Read up on photography and practice with what you have. From there you will gradually become more educated on your shooting style and what lenses you will need.

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