Page 2 of 2 FirstFirst 12
Results 21 to 29 of 29

Thread: Uneven aperture blades?

  1. #21
    Senior Member
    Join Date
    Jan 2005
    Location
    Pasir Ris, Singapore
    Posts
    14,002

    Default Re: Uneven aperture blades?

    Quote Originally Posted by Rashkae View Post
    Depends on the lens too. Most of my lenses maintain a circular shape till about f/5.6, but after that the aperture blades remain in a fairly symmetrical shape
    That's what i meant when i said at smaller apertures, it will not be in such a perfect shape.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  2. #22
    Senior Member
    Join Date
    Jan 2005
    Location
    Pasir Ris, Singapore
    Posts
    14,002

    Default Re: Uneven aperture blades?

    Quote Originally Posted by calebk View Post
    Snoweagle, do you have any additional info that backs up your statement?
    The lenses speak for itself.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  3. #23

    Default Re: Uneven aperture blades?

    Quote Originally Posted by fatigue View Post
    I have seen more than 20 of this lens.
    Most of them got uneven aperture blades

    There's no problem with your lens
    Thanks fatigue and the rest of you for clarifying. I don't have that many lenses (yet ) so no experience before hehe
    Click... and the moment lives forever

  4. #24
    Senior Member
    Join Date
    Jul 2006
    Location
    Clementi
    Posts
    10,596

    Default Re: Uneven aperture blades?

    Quote Originally Posted by Snoweagle View Post
    That's what i meant when i said at smaller apertures, it will not be in such a perfect shape.
    Actually, what Rashkae meant is that even past f/5.6, the shape is still regular, just not circular.

  5. #25

    Default Re: Uneven aperture blades?

    Quote Originally Posted by calebk View Post
    Actually, what Rashkae meant is that even past f/5.6, the shape is still regular, just not circular.
    yeah i think so too. it should be regular but not circular since there is only that few blades.

    if this is so, then the TS's lens is got problem or not? as i notice the blade at 7 O'clock position didn't close as much as the rest of the blades...
    [Canon EOS 5D II + 40D | EF 16-35mm f/2.8L II + 70-200mm f/2.8L IS II] [Fuji X-Pro1 + XF35mm f/1.4]

  6. #26
    Senior Member
    Join Date
    Jan 2005
    Location
    Pasir Ris, Singapore
    Posts
    14,002

    Default Re: Uneven aperture blades?

    Quote Originally Posted by calebk View Post
    Actually, what Rashkae meant is that even past f/5.6, the shape is still regular, just not circular.
    That's what i meant by saying perfect shape but at smaller apertures e.g. f/8 and smaller, it's not that regular.
    Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.

  7. #27
    Senior Member
    Join Date
    Jul 2008
    Location
    Tampines
    Posts
    2,622

    Default Re: Uneven aperture blades?

    Basically it's the construction of the lens whereby the blades overlapped each other to
    form the aperture and the irregular opening is normal.

  8. #28
    Senior Member
    Join Date
    Jun 2003
    Location
    Here
    Posts
    3,779

    Default Re: Uneven aperture blades?

    Most 35mm format lenses aperture blade more or less inherent such problem. But yet, I hardly encounter such problem happen in those 120mm format lenses aperture blade.
    Maybe I'm wrong too.
    Last edited by Spectrum; 17th September 2008 at 11:45 PM.

  9. #29
    Senior Member fatigue's Avatar
    Join Date
    Sep 2005
    Location
    Blk138 Bedok North Ave3
    Posts
    2,924

    Default Re: Uneven aperture blades?

    Quote Originally Posted by zac08 View Post
    Problem with the construction? Or design issue?
    I believe it's more on making the lens affordable rather than design problem.
    Having a regular aperture shape means tighter parts specs, perhaps additional QC/QA process which only translates to additional cost.
    These lens makers can produce perfect aperture shapes if they want to, but it will be costly.


    Quote Originally Posted by H4lcyon View Post
    Thanks fatigue and the rest of you for clarifying. I don't have that many lenses (yet ) so no experience before hehe
    I don't have much lenses as well. My hobby/part-time gives me the opportunity to try and test several lenses.
    9815-1974
    FB: Hilos Camera Repair

Page 2 of 2 FirstFirst 12

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •