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goldenarrow goldenarrow is offline

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  1. IOO
    I read your review on the HD Pentax-D FA 28-105mm F3.5-5.6 ED DC WR.

    This is a lens for full frame, and on K3 you have a smaller sensor, so you must multiply with 1,5. So on APC it is a 52,5-202,5 lens compared to what the same lens on full frame have to be.

    When Pentax on their lenses for the big 67 film cameraes (60x70mm large filmframe) write that the lens is 200 mm, that means it will be a 200 mm on a camera with a sensor 24x36 mm, Here you have to dived 200 with 70:36=1,944. So the 200mm on 67 gives you about the same area it covers as a 100 mm does on 24X36 (old film/FF).

    All lenses refers to the focal lenght on the old film size (so caled FF). Also lenses built for smaler sensors like the Q system. The 8,5 mm is copared to FF, on the first Q it's the same as 47,6 is on FF, on the later (wich has larger sensor) the same as 39,1on FF.

    Read this: Crop factor - Wikipedia

    Best regards IOO
  2. Mike C
    Mike C

    Good to meet you the other day at Magee. If you don't post in the birding forum let me know where you post some of your pictures up. I going to post some in the birding forum and in the 300mm lens club.

    Talk to you later
    Mike Caldwell

About Me

  • About goldenarrow
    United States
    Chicago Suburbs.
    Pentax Cameras
    K-3, K200D, Pentax Point-and-Shoots
    Photographic Equipment
    Pentax: 40 XS, 50 DA, 100 DFA-WR Macro.
    Sigma: 10-20 DG (f/4), 70-200 OS HSM
    Tamron: SP 28-75 XR Di.
    LongLens: Borg 67FL 300mm+Takahashi 1.6x, Pentax Meade Takahashi eyepieces.
    Flash: Ricoh 300P Speedlites, Pentax FG200.
    Heads: Manfrotto 498RC4 Ball Head, 410 Jr. Geared Head, Kenko Alt-Az (KDSII), Sirui ballhead.
    Tripod: Benro C285-6n CF, Sirui T2005X.
    Software: Adobe Elements 9, Corel PaintShopPro X6, DxO Optics Pro 11.
    About Me
    Curious about everything, not enough time for anything!
    Recent interests: photography, birding, astronomy.
    Computer Administrator.


Total Posts
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General Information
  • Last Activity: 04-12-20
  • Join Date: 06-10-09
  • Referrals: 0
  • Total Likes Received: 9

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1 like Pentax HD D-FA 28-105mm f/3.5-5.6 10-20-21 05:02 AM fasterpussycat
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goldenarrow has received a total of 9 Likes | View All of goldenarrow's Liked Posts | View Posts goldenarrow Likes

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