Adjusting diaphram on SMC pentax 165mm f/2,8

Discussion in 'Medium Format Cameras and Accessories' started by Soeren, Oct 21, 2006.

  1. Soeren

    Soeren Member

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    I was perhaps a bit too fast in buying this lens and I have found out that the blades in the diaphram makes an odd shape at f/4.0 to f/5.6+½.The opening is symetric but the edges is kind of "starlike" well not quite but I don't know how to descripe it more precise. Can the aperture blades be adjusted? will it cost a fortune? The lens was cheap and I may be happy to use it either wide open or stopped down to f/8. There is a waranty on it so maybe.
    Cheers
    Søren
     
  2. luvcameras

    luvcameras Advertiser Advertiser

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  3. Soeren

    Soeren Member

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    Thanks Luvcameras
    Are you saying that the strange shape made by the aperture blades until stopped down to f/5.6 is normal for this lens?
    Cheers
    Søren
     
  4. luvcameras

    luvcameras Advertiser Advertiser

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    can I see the shape ? I dont know what you think "strange shape" is
     
  5. max_ebb

    max_ebb Member

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    After reading this post, I was curious so I looked at the shape of the aperture on my 165 pentax lens. When it's barely stopped down (f/4.0 to f/5.6), I noticed it has kind of a circular saw tooth shape. It's normal. No lens has a perfect circle shaped aperture opening, especially if it's only slightly stopped down.