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Thread: (new) Pentax 24-70mm f/2.8 for full frame

  1. #1
    A royal pain in the bum! arthurking83's Avatar
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    (new) Pentax 24-70mm f/2.8 for full frame

    The Pentax D FA 24-70mm f2.8ED SDM lens has just been announced.

    Normally I'd leave this news for Kym to post, but when I first saw the new item, it struck me as so familiar that I had to check up on it.

    I'm convinced that this new lens is almost 99.9999% positively a rebranded Tamron 24-70/2.8 VC, without the vibration control mechanism(which obviously Pentax cameras don't need)

    That's a good thing, in that the lens is very nice in so many respects(maybe just a touch large in terms of diameter, but easily lived with).
    It loses a few grams in weight, which is probably due to the lack of a VC mechanism.
    Which brings me to the point of why I posted this news item .. I'd always wondered why Tamron never listed this lens for the Pentax mount.
    Tamron only ever listed the Nikon, Canon and Sony mounts for this lens.

    Here's the Tamron 24-70VC lens site for comparison
    Nikon D800E, D300, D70s
    {Nikon} -> 50/1.2 : 500/8(CPU'd) : 105/2.8VR Micro : 180/2.8ais : 105mm f/1.8ais : 24mm/2ais
    {Sigma}; ->10-20/4-5.6 : 50/1.4 : 12-24/4.5-5.6II : 150-600mm|S
    {Tamron}; -> 17-50/2.8 : 28-75/2.8 : 70-200/2.8 : 300/2.8 SP MF : 24-70/2.8VC


  2. #2
    It's all about the Light!
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    Tamron do (sometimes) do a Pentax mount. I have a Tamron 28-75/2.8 in a Pentax mount.
    Yes, they have done Pentax branded lenses (sold by Pentax) for jacked up prices.
    Last edited by Kym; 26-09-2015 at 9:01am.
    regards, Kym Gallery Honest & Direct Constructive Critique Appreciated! ©
    Digital & film, Bits of glass covering 10mm to 500mm, and other stuff



  3. #3
    It's all about the Light!
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    HD Pentax-D FA 24-70mm f/2.8 ED SDM WR: 17 elements in 12 groups
    Tamron Tamron SP 24-70mm f/2.8 Di USD: 17 elements in 12 groups

    Pentax: 3 ED (Extra-low Dispersion) elements, 3 aspherical elements, 1 aspherical element made of single anomalous dispersion glass
    Tamron: 3 LD (Low Dispersion) elements, 2 XR (Extra Refractive Index) elements, 3 glass molded aspherical elements, 1 hybrid aspherical element

    Pentax: ultrasonic motor
    Tamron: ultrasonic motor

    Pentax: minimum focus = 0.38m
    Tamron: minimum focus = 0.38m

    Pentax: maximum magnification = 0.20x
    Tamron: maximum magnification = 0.21x

    Pentax: filter thread = 82mm
    Tamron: filter thread = 82mm

    Pentax: 9 aperture blades, rounded
    Tamron: 9 aperture blades, rounded

    Pentax: diameter = 88.5 mm
    Tamron: diameter = 88.0 mm

    Pentax: total length = 109.5mm
    Tamron: total length = 117mm (Canon EF version)

    Pentax: weight = 812 g with hood
    Tamron: weight = 825 g with hood
    Last edited by Kym; 26-09-2015 at 9:00am.

  4. #4
    Moderately Underexposed I @ M's Avatar
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    I read the thread and had a quick wonder if Pentax were working with Tokina again but a quick check of the new Tokina ruled that out.
    It isn't made ( yet ) in a Pentax mount and is an absolute porker at 1010 grams.

    Plus a few other differences ----- http://www.tokinalens.com/tokina/pro...470mmf28profx/
    Andrew
    Nikon, Fuji, Nikkor, Sigma, Tamron, Tokina and too many other bits and pieces to list.



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