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Thread: Longest focal length, lowest f-number

  1. #1
    Senior Member UncleFai's Avatar
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    Default Longest focal length, lowest f-number

    I am curious... I know there are lenses like 50mm that can go to even sub f1. But what is the longest commercially available lens that has the lowest f-stop. 600mm typically are at f4. Also, 300mm can be done at f2.8. Anything else?

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    Default Re: Longest focal length, lowest f-number

    How could you forget the legendary Sigma 200-500mm F2.8?

  3. #3

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    Quote Originally Posted by UncleFai View Post
    I am curious... I know there are lenses like 50mm that can go to even sub f1. But what is the longest commercially available lens that has the lowest f-stop. 600mm typically are at f4. Also, 300mm can be done at f2.8. Anything else?
    Leica Noctilux 50mm f/0.95 ASPH?
    Sony A7/ Sigma 19-2.8 E/ CV 35-1.7 ASPH/ FE 55-1.8/ MC Rokkor 58-1.2/ Pentax SMC K 135-2.5

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    Senior Member UncleFai's Avatar
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    Default Re: Longest focal length, lowest f-number

    Quote Originally Posted by Thoth View Post
    Leica Noctilux 50mm f/0.95 ASPH?
    I am aware of that of course. But 50mm is not "long". I am interested to know of long ones. Now 200-500mm f2.8 - that's something.

  5. #5

    Default Re: Longest focal length, lowest f-number

    Quote Originally Posted by UncleFai View Post
    I am aware of that of course. But 50mm is not "long". I am interested to know of long ones. Now 200-500mm f2.8 - that's something.
    This?

    Sigma APO 200 - 500 mm F2.8 lens: Digital Photography Review
    Sony A7/ Sigma 19-2.8 E/ CV 35-1.7 ASPH/ FE 55-1.8/ MC Rokkor 58-1.2/ Pentax SMC K 135-2.5

  6. #6

    Default Re: Longest focal length, lowest f-number

    The only lens I know being longest focal length with widest sub f/1 plus aperture is this:

    Vivitar Professional 135mm f/1.5 - Camera-wiki.org - The free camera encyclopedia
    Sony A7/ Sigma 19-2.8 E/ CV 35-1.7 ASPH/ FE 55-1.8/ MC Rokkor 58-1.2/ Pentax SMC K 135-2.5

  7. #7

    Default Re: Longest focal length, lowest f-number

    Quote Originally Posted by UncleFai View Post
    I am curious... I know there are lenses like 50mm that can go to even sub f1. But what is the longest commercially available lens that has the lowest f-stop. 600mm typically are at f4. Also, 300mm can be done at f2.8. Anything else?
    400mm/F2.8,800mm/F5.6.
    I cant wait to see your birding shot with such lenses

  8. #8

    Default Re: Longest focal length, lowest f-number

    2800mm F2.8

  9. #9

    Default

    Quote Originally Posted by kei1309 View Post
    2800mm F2.8
    Telescope?
    Sony A7/ Sigma 19-2.8 E/ CV 35-1.7 ASPH/ FE 55-1.8/ MC Rokkor 58-1.2/ Pentax SMC K 135-2.5

  10. #10

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    Quote Originally Posted by Thoth View Post

    Telescope?
    Probably some observatory.

    Anyway there's a 1200mm f/5.6L that costs $120,000

  11. #11
    Senior Member giantcanopy's Avatar
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    Default Re: Longest focal length, lowest f-number

    The ( built to order ) Zeiss Apo Sonnar T* 1700 mm F4 ( Built for a Hasselblad 6x6 ), so if you happen to have a Hasselblad body, might as well ..
    Last edited by giantcanopy; 15th May 2013 at 11:50 PM.

  12. #12
    Senior Member UncleFai's Avatar
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    Default

    Quote Originally Posted by Turbonetics View Post

    400mm/F2.8,800mm/F5.6.
    I cant wait to see your birding shot with such lenses
    You will have to wait long long long long...

    No lah... Chit chatting with a friend and this issue came up so decided to ask CS lor.

  13. #13

    Default Re: Longest focal length, lowest f-number

    I would be getting the canon 800mm f5.6 in 3 months time, would post a review then

  14. #14

    Default Re: Longest focal length, lowest f-number

    I think Nikon's 300mm f/2 has the longest focal length, lowest f-number combination in my books.

  15. #15

    Default Re: Longest focal length, lowest f-number

    14" telescope, configured with Hyperstar system will give F1.9 at focal length 675mm.

  16. #16
    Senior Member giantcanopy's Avatar
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    Default Re: Longest focal length, lowest f-number

    The out of production Zoomar or Zoomatar 250mm f1.3 . Made for medium format cameras.

  17. #17

    Default Re: Longest focal length, lowest f-number

    Quote Originally Posted by Thoth View Post
    The only lens I know being longest focal length with widest sub f/1 plus aperture is this:

    Vivitar Professional 135mm f/1.5 - Camera-wiki.org - The free camera encyclopedia
    Crazy cool! I like this like a mother likes a baby.

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