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Thread: Image is not sharp at 105mm

  1. #1

    Default Image is not sharp at 105mm

    Hi, I'm currently using a D3100 paired with a 18-105mm. Images are pretty sharp at 18-55mm but at 105mm they are mostly not sharp. VR is turned on. Can I get some help on this? Thank you (:

  2. #2

    Default Re: Image is not sharp at 105mm

    sorry but i cant imagine how your pictures look like by just reading 37 words.

  3. #3

    Default Re: Image is not sharp at 105mm

    Lol, you actually counted the number of words I wrote. Oh, then to put it simply, does the IQ degrade from 55mm onwards or is it supposed to be approximately the same as at 18-55mm.

  4. #4

    Default Re: Image is not sharp at 105mm

    In other words, please post a pic so we can analyze the situation more better and help you out.

  5. #5

    Default Re: Image is not sharp at 105mm

    i'm not sure how you define "degrade", as everyone has their own threshold levels.

    seriously, a picture speaks not just 37 but a thousand words.

  6. #6

    Default Re: Image is not sharp at 105mm

    don't expect the best from this lens. u want sharpness, set your aperture between f8 - f22.

  7. #7

    Default Re: Image is not sharp at 105mm

    stay away from the extreme end of the aperture range to avoid diffraction.

    most lenses are normally sharp at between f8-f11(or f16). but there are lemons around too, so yeah.

    kit lenses are good but dont overly expect from them.

  8. #8

    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by fastfocusing View Post
    don't expect the best from this lens. u want sharpness, set your aperture between f8 - f22.
    Incorrect. After f16 diffraction sets in.

    TS, most lenses, especially the "zoom" lenses, are not at their sharpest when at maximum aperture. try setting to f/8-f/11 and try again.
    Alpha

  9. #9

    Default Re: Image is not sharp at 105mm

    Thank you for all the positive feedbacks and help. I'll try em and maybe post some pictures tmr (:

  10. #10
    Moderator daredevil123's Avatar
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    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by ahjie86 View Post
    Hi, I'm currently using a D3100 paired with a 18-105mm. Images are pretty sharp at 18-55mm but at 105mm they are mostly not sharp. VR is turned on. Can I get some help on this? Thank you (:
    Without samples to look at, I would say it comes down to improper technique. You need to make sure that your shutter speed is at least 1/focal length when not on vr. On vr you need to calculate what is the minimum shutter speed for your focal length. For 105mm minimum shutter speed will be 1/100s. With vr minimum shutter speed will be around 1/15 assuming you get a real 3 stop vr advantage. To be safe I would say keep minimum shutter speed to 1/30s. And you need to learn proper handholding techniques as well.

  11. #11
    Moderator daredevil123's Avatar
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    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by fastfocusing View Post
    don't expect the best from this lens. u want sharpness, set your aperture between f8 - f22.
    Smallest aperture on aps-c cameras is f16 before diffraction sets in.

  12. #12
    Senior Member Override2Zion's Avatar
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    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by daredevil123 View Post
    ...I would say it comes down to improper technique...
    It would help much if you could show a photos of the same subject taken under 55mm and at 105mm. I have a feeling it might be due to what bro daredevil mentioned.
    Having VR on is one thing, using it correctly is another issue. When you attempt to focus on a subject by half depressing the shutter button, you will hear the "click" of the VR mechanism kicking in, hold steady and leave about half to a second for the VR system to balance out to steady state. This is when you can fully depress the shutter button to make the exposure. A better test would be to mount the camera on tripod with VR off to test the IQ at 55mm and 105mm, this should give some conclusive results.
    Last edited by Override2Zion; 16th December 2010 at 07:55 PM.
    Nikon D200/D700/D800 User :)
    [www.PositiveStudioProductions.com]

  13. #13

    Default Re: Image is not sharp at 105mm

    18-105mm is a lousy lens

    Read more here

    http://www.photozone.de/nikon--nikko...3556vr?start=2

    The better on is 16-85mm

  14. #14
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    Default Re: Image is not sharp at 105mm

    105mm is not as sharp because quality falls off the greater the zoom length, 18-55mm is usually sharper across all the kit lenses within that range.
    Enlighten me...
    [Uluru]

  15. #15

    Default Re: Image is not sharp at 105mm

    So what is the best aperture to take landscape for instance on a tripod? Some mentioned f8-f16. But which will provide the sharpest? f8? f11? f13? f16? Does it differ for different lenses?

    Also TS, perhaps your VR is not off when set on a tripod. The VR will try to compensate, but since the tripod is too still, it introduces unnecessary compensation, hence the blur.

  16. #16
    Moderator daredevil123's Avatar
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    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by hotchoco1ate View Post
    So what is the best aperture to take landscape for instance on a tripod? Some mentioned f8-f16. But which will provide the sharpest? f8? f11? f13? f16? Does it differ for different lenses?

    Also TS, perhaps your VR is not off when set on a tripod. The VR will try to compensate, but since the tripod is too still, it introduces unnecessary compensation, hence the blur.
    It really depends on what you are trying to achieve.

  17. #17
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    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by DM101 View Post
    18-105mm is a lousy lens

    Read more here

    http://www.photozone.de/nikon--nikko...3556vr?start=2

    The better on is 16-85mm
    Lousy? Is that so?

    http://www.flickr.com/photos/tinatwo/3246668679/
    http://www.flickr.com/photos/alemdag/4009238218/
    http://www.flickr.com/photos/zs-photography/4222075333/
    http://www.flickr.com/photos/zs-photography/3410777642/
    http://www.flickr.com/photos/resouzaesouza/4614098402/
    http://www.flickr.com/photos/fromzeo...de/3282603748/

    This is a quick 2 min search in Flickr and I grabbed a few links at random...

    Most people who complain lens is lousy, are people who can't produce good pictures and blame it on the equipment.

  18. #18
    Senior Member Override2Zion's Avatar
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    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by hotchoco1ate View Post
    So what is the best aperture to take landscape for instance on a tripod? Some mentioned f8-f16. But which will provide the sharpest? f8? f11? f13? f16? Does it differ for different lenses?
    You want star shaped lights on your night shots use a smaller aperture. You have moving subjects and you don't want them too blurred, use larger apertures. You want to blur out moving elements but you don't have a ND filter and your ISO is already at lowest then use a smaller aperture. Depends on situation really, the settings are all about compromise.
    Nikon D200/D700/D800 User :)
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  19. #19
    Moderator daredevil123's Avatar
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    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by DM101 View Post
    18-105mm is a lousy lens

    Read more here

    http://www.photozone.de/nikon--nikko...3556vr?start=2

    The better on is 16-85mm
    And BTW, photozone gave it 3 stars. You know how many expensive lenses did not even get 3 stars?

    And they said it is a very "attractive" offering from Nikon...

  20. #20

    Default Re: Image is not sharp at 105mm

    Quote Originally Posted by Override2Zion View Post
    You want star shaped lights on your night shots use a smaller aperture. You have moving subjects and you don't want them too blurred, use larger apertures. You want to blur out moving elements but you don't have a ND filter and your ISO is already at lowest then use a smaller aperture. Depends on situation really, the settings are all about compromise.
    Okay i got it. But usually i just want to achieve maximum depth of field for sharpness. To paraphrase what you said, for general landscapes, a smaller aperture up to f16 will yield better results? But what if im already at hyperfocal distance?

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