Aperatue blades not making a perfect circle? Return the lense?

Discussion in 'Beyond the Basics' started by kawasakiguy37, Jun 8, 2010.

  1. kawasakiguy37

    kawasakiguy37 TPF Noob!

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    Ive recently been trying to aquire a mint condition nikkor 85mm 1.4 lense. I want to use it mainly for portraits and everything else, as its supposedly an amazing lense. I bought the MF AI-S version from KEH ab out 2 weeks ago. Lense arrived in flawless condition, but didnt stop down at all (not sure whats wrong). KEH sent me a replacement that also rated as "EX" (meaning execellent, their 3rd highest condition). This new one stops down, BUT

    The aperature hole, when stopped down, is not perfectly circular. It has 9 elements and some are longer than others, especialy at F/16, and it gives it a sort of slightly off balance shape.

    KEH told me this was normal for this type of lense and I should be fine to use. I am, however, not too happy, and pretty sure I am going to return it.

    Am I overreacting or will this affect picture quality? All my other used nikkors have had perfectly rounded (by rounded I mean proportional polygons) diaphrams.
     
  2. Village Idiot

    Village Idiot No longer a newbie, moving up!

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    Compare it to other samples of the 85 f/1.4. Does the Bokeh on your photos show up abnormal?
     
  3. kawasakiguy37

    kawasakiguy37 TPF Noob!

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    I havent tested it extensively as it just arrived, but I have not noticed weird bokeh yet. I am just kinda aggravated that I paid 600 bucks for a MF lense that is supposedly one of Nikons best ever, and it has this problem....especially with 9 aperture blades!!!

    edit: and I have no other 85 1.4's to compare to, sadly, they arent too easy to come by
     
  4. KmH

    KmH Helping photographers learn to fish Supporting Member

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    No lens that uses only 9 aperture blades makes a perfectly circular lens opening.

    NEW
    As packaged by manufacturer complete with manufacturer's USA warranty. Not previously owned or used by a consumer. *You have probably seen the words "NEW" or "LOWER PRICE" listed online or in our catalog where prices usually appear. Due to certain manufacturer's minimum pricing requirements, we are not permitted to publish the price if we sell it less than the manufacturer's Minimum Advertised Price (MAP). While these listings may seem inconvenient, it is our way of letting you know that when you call or click-through on the website, you will be quoted the lowest pricing anywhere for comparable items.

    DEMO
    As packaged by manufacturer complete with manufacturer's USA warranty. Never owned by a consumer but used for demonstration.

    LN
    "Like New" 99% -100% of NEW. Includes original box and instructions.

    LN-
    "Like New Minus" 97-99% of original condition. Extremely slight wear only seen upon very close inspection. Box and accessories usually not included. Glass perfect*.

    EX+
    "Excellent Plus" 90-96% of original condition. Exceptionally nice. May have slight wear on finish but visible only under close inspection. Glass very clean*.

    EX
    "Excellent" 80-89% of original condition. Shows moderate wear. May have small dents and/or dings and slight finish wear. Glass may have slight marks and/or blemishes that will not affect picture quality*.

    BGN
    "Bargain" 70-79% of original condition. Shows more than average wear. May have dents, dings and/or brassing and finish loss. Glass may have marks and/or blemishes that should not affect picture quality*.

    UG
    "Ugly" Very rough looking. Multiple impressions in metal, excessive finish loss and brassing. Glass will have marks, fungus and/or haze which will affect picture quality.

    AI
    "As-Is" Usually to be used for parts only. All equipment sold in As-Is category carries no warranty nor return privileges. The equipment most likely doesn't work and may have missing pieces. Defects will include, but are not limited to the problems listed on the description.
     
  5. Flash Harry

    Flash Harry TPF Noob!

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    Its fine, test it, if not happy then return but its a great lens as long as you get focus spot on when wide open, F2 is best. H
     
  6. Garbz

    Garbz No longer a newbie, moving up!

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    For your comparison:

    [​IMG]
    [​IMG]
    [​IMG]
     
  7. GeneralBenson

    GeneralBenson TPF Noob!

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    Garbz, is that top one wide open? Shouldn't it be a perfect circle wide open?

    OP, I'm pretty sure no lens is a perfect circle when stopped down. Even with rounded aperture blades, when you start stopping down, you would progressively start seeing the 9-sided polygonal shape. Or do you mean that it's oblong, as in, not an equal-sided nonagon?
     
  8. Derrel

    Derrel Mr. Rain Cloud

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    The slight degree of out of round shape that Garbz's photo set is showing is reasonably common--many lenses are not perfectly round at their smaller apertures, especially at the f/16 and f/22 zone. One blade is quite often slightly out of alignment, as seen on Garbz's lens. At wider apertures like f/5.6 and wider, the out of round nature of a slightly mis-aligned diaphragm blade is pretty difficult to see in out of focus highlights.
     
  9. Garbz

    Garbz No longer a newbie, moving up!

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    No the top one is at f/2. You wanted to see the blades so I figured it would be pointless to show the f/1.4 :)
     
  10. kawasakiguy37

    kawasakiguy37 TPF Noob!

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    Mine is like his, but more unequal (as in not an equal side polygon). I dont expect it of course to form a perfect circle, I just meant merely that the blades are not even (quite oblong). Ill post some pictures of mine soon

    edit:

    Here are the pictures:

    [​IMG]

    [​IMG]

    For some reason it looks worse in person than these pictures, but maybe its just my e yes
     
    Last edited: Jun 12, 2010
  11. reznap

    reznap No longer a newbie, moving up!

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    I wouldn't know better - I'm still pretty new - but it sounds like you're being super-critical and it's normal. Do the blades on your other lenses form perfect polygons?

    On a side note, those are the coolest aperture blade macro shots I've seen. :p
     
  12. Garbz

    Garbz No longer a newbie, moving up!

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    That is definitely not an issue. Here's a little food for thought, bokeh is only rendered in the perfect shape of the aperture blades when they are a) stopped down, and b) the edge of the lens doesn't come into play.

    If the lens produces good pictures at f/1.4 where only the very centre meets this criteria then you won't at all notice the slight variations of the aperture blades.
     

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