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Thread: Why do long zoom lenses weigh roughly the same?

  1. #1

    Default Why do long zoom lenses weigh roughly the same?

    I was looking at long zoom lenses for Canon in the last week at saw that lenses that go from 18-135mm weigh about the same as for 18-200mm, 18-250mm, 18-270mm. Of course the longer the zoom, the more expensive, but I'm wondering why they weigh the same (400-450grams). I'd assume that the longer the zoom, the more glass you'd need. The more glass you need, the heavier it should be. Thus 18-55 < 18-135 < 18-200 < 18-250 < 18-270, right? But it's not so. In fact, the 18-55 kit lenses for all brands comes in at about 200-230 grams, which is only half that of Tamron 18-270mm and the Tamron also includes ultrasonic auto focus motor and stabilisation.

    Any ideas why they weigh the same?
    Samsung Galaxay S4 Zoom, Pentax MX-1,Olympus OM-D EM-5 (wet weather camera), Pentax X-5

  2. #2

    Default Re: Why do long zoom lenses weigh roughly the same?

    WTB Manfrotto RC4 L Bracket

  3. #3

    Default Re: Why do long zoom lenses weigh roughly the same?

    because some of the lenses have been stored so long that fungus grew in them.

    funny thing is, the fungus knew how much to grow, so that all the lenses would weigh roughly the same.

    so please, inspect the lens before you make a purchase

  4. #4

    Default Re: Why do long zoom lenses weigh roughly the same?

    Quote Originally Posted by JohnTaylor View Post
    I'd assume that the longer the zoom, the more glass you'd need.
    That assumption sounds logical, but simplistic, because there are other factors that affect the weight of a lens. Without knowing which lenses you were comparing specifically, it's quite likely that the lenses you were looking at are more similar than they are different - plastic body, slow, designed to be affordable and compact, usually sized for a cropped (APS-C) sensor. In lenses like that, while the number of elements (glass) may differ, the additional elements are pretty small, not adding that much to the weight.

    Canon EF-S 18-200mm f/3.5-5.6 IS / 102mm / 600g / 16 elements in 12 groups



    Tamron 28-300mm f/3.5-6.3 Di VC / 99mm / 555g / 18 elements in 13 groups



    Tamron 18-270mm F/3.5-6.3 Di II VC PZD / 96.4mm / 450g / 16 elements in 13 groups


    Assuming most of the construction/specs are kept the same, how much more will those small elements weight?

    Compare those with something built with better specs:

    Canon EF 28-300mm f/3.5-5.6L IS USM / 184mm / 1670g / 22 elements in 16 groups


  5. #5
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    Default Re: Why do long zoom lenses weigh roughly the same?

    Tamron 200-500mm weight 1.2 kg

    Sigma APO 200-500mm weight 15.7kg

    Last edited by ricohflex; 13th August 2013 at 12:25 AM.

  6. #6
    Member CasualBear's Avatar
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    Cool Re: Why do long zoom lenses weigh roughly the same?

    Quote Originally Posted by ricohflex View Post
    Tamron 200-500mm weight 1.2 kg

    Sigma APO 200-500mm weight 15.7kg

    because when u turn the 2nd ring on the Sigma 200-500mm a full 90 degrees, u can lauch a surface to air missile.
    the trick to activate this special feature is u need to find the sweet aperture spot of f/22.2

    bazinga!
    Leave nothing but footprints, take nothing but photos..~ ;)

  7. #7

    Default Re: Why do long zoom lenses weigh roughly the same?

    Spend your time on photography not weight of lenses.

  8. #8
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    Default Re: Why do long zoom lenses weigh roughly the same?

    Compare the max aperture rather than zoom length.

  9. #9

    Default Re: Why do long zoom lenses weigh roughly the same?

    And the Micro 4/3 Olympus 75-300mm (35mm equivalent focal length 150-600mm) weights 423 gram.
    Get something you can carry around. Long birding trips are no joke.

  10. #10

    Default Re: Why do long zoom lenses weigh roughly the same?


  11. #11
    Moderator catchlights's Avatar
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    Default Re: Why do long zoom lenses weigh roughly the same?

    Quote Originally Posted by JohnTaylor View Post
    I was looking at long zoom lenses for Canon in the last week at saw that lenses that go from 18-135mm weigh about the same as for 18-200mm, 18-250mm, 18-270mm. Of course the longer the zoom, the more expensive, but I'm wondering why they weigh the same (400-450grams). I'd assume that the longer the zoom, the more glass you'd need. The more glass you need, the heavier it should be. Thus 18-55 < 18-135 < 18-200 < 18-250 < 18-270, right? But it's not so. In fact, the 18-55 kit lenses for all brands comes in at about 200-230 grams, which is only half that of Tamron 18-270mm and the Tamron also includes ultrasonic auto focus motor and stabilisation.

    Any ideas why they weigh the same?
    did you get what you want to know?

    if you have noting further to ask, noting to add, please close this thread and move on.
    Shoot to Live, Live to Shoot
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  12. #12
    Member XavierShoot's Avatar
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    Default Re: Why do long zoom lenses weigh roughly the same?

    Quote Originally Posted by catchlights View Post
    did you get what you want to know?

    if you have noting further to ask, noting to add, please close this thread and move on.
    s

    +1
    Canon 60D | And Legs as Lens to cover every single focal length i ever needs.

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