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F1 ?

  • 06-08-2008 12:36pm
    #1
    jackdaw
    Closed Accounts Posts: 1,788 ✭✭✭


    Is f1 possible ??

    I see Canons widest is the f1.2 L prime .. very expensive lens , is there
    an f1 or is this very concept impossible ?

    as in it's impossible to have an aperture width the _exact_ focal length ?


Comments

  • #2
    Paulw
    Registered Users, Registered Users 2 Posts: 13,381 ✭✭✭✭Paulw


    Canon used to have a 50mm f/1 lens. I think it was discontinued.

    http://photo.net/canon-eos-digital-camera-forum/007wec


  • #3
    viking
    Registered Users, Registered Users 2 Posts: 1,509 ✭✭✭viking


    Think Stanley Kubrick shot a candlelit scene in one of his movies using a film camera with an f/1 lens.

    EDIT: it was actually a f/0.7 50mm lens


  • #4
    melekalikimaka
    Moderators, Education Moderators, Music Moderators Posts: 10,686 Mod ✭✭✭✭melekalikimaka


    never paid for it either


  • #5
    Roen
    Closed Accounts Posts: 4,620 ✭✭✭Roen


    They did a 50mm ƒ.95 as well and Leica also did a 90mm ƒ.95 too. They tend not to be used for traditional photographic purposes though.


  • #6
    5uspect
    Moderators, Arts Moderators Posts: 10,520 Mod ✭✭✭✭5uspect


    Wasn't the 50mm f1.0 around 3 grand?


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  • #7
    Paulw
    Registered Users, Registered Users 2 Posts: 13,381 ✭✭✭✭Paulw


    RRP - $4210 for the Canon 50mm f/1 lens. :D

    I'm sure you can find them 2nd hand online somewhere.


  • #8
    Hugh_C
    Registered Users, Registered Users 2 Posts: 2,852 ✭✭✭Hugh_C


    jackdaw wrote: »
    Is f1 possible ??



    Yera I thought it was a fast car ...

    :P


  • #9
    jackdaw
    Closed Accounts Posts: 1,788 ✭✭✭jackdaw


    jaysus !! 3K ..

    whats the point... surely the diff can't be _that_ much from f1.4, or f1.2 ..


  • #10
    DaireQuinlan
    Registered Users, Registered Users 2 Posts: 6,713 ✭✭✭DaireQuinlan


    jackdaw wrote: »
    jaysus !! 3K ..

    whats the point... surely the diff can't be _that_ much from f1.4, or f1.2 ..

    well its an entire stop faster than 1.4, half a stop faster than 1.2 ...
    In reality there are very few situations where you'd probably want to use it. I get the impression that they probably sold a few to the small group of people who actually need it, and the rest to people who thought it was kinda cool to have an F1.0 lens :-) I mean really, given a chance, wouldn't you ? Hmmm ??


  • #11
    Paulw
    Registered Users, Registered Users 2 Posts: 13,381 ✭✭✭✭Paulw


    http://en.wikipedia.org/wiki/Canon_EF_50mm_lens#50mm_f.2F1.0L_USM

    Go have a read.

    Some interesting info there.


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  • #12
    challengemaster
    Registered Users, Registered Users 2 Posts: 16,930 ✭✭✭✭challengemaster


    Hugh_C wrote: »
    Yera I thought it was a fast car ...

    :P

    I thought this was about photographing F1 racing!! *sigh*


  • #13
    Paulw
    Registered Users, Registered Users 2 Posts: 13,381 ✭✭✭✭Paulw


    Major difference between F1 and an f/1 lens.


  • #14
    jackdaw
    Closed Accounts Posts: 1,788 ✭✭✭jackdaw


    Paulw wrote: »
    http://en.wikipedia.org/wiki/Canon_EF_50mm_lens#50mm_f.2F1.0L_USM

    Go have a read.

    Some interesting info there.

    OK, now that we are on F stops,
    is it exponential ?
    for example you say its 1 whole stop from 1.2 - 1.4 .. but 2.8 + 1 stop = 4 ..

    FULL STOPS (fill in the blanks)
    f/1.2
    f/1.4
    f/1.8 ?
    f/2.8
    f/4
    f/5.6
    f/8
    f/11
    f/16 ??
    f/22 ??
    f/32 ??
    f/64 ??


  • #15
    DaireQuinlan
    Registered Users, Registered Users 2 Posts: 6,713 ✭✭✭DaireQuinlan


    jackdaw wrote: »
    OK, now that we are on F stops,
    is it exponential ?
    for example you say its 1 whole stop from 1.2 - 1.4 .. but 2.8 + 1 stop = 4 ..

    For a good approximation you can multiply by 1.4 to get the next full stop up. So the next stop after f/1 is f/1.4. ACTUALLY its sqrt(2) which is about 1.4 so the approximation stands pretty well. Another good rule of thumb is that (given the above its fairly obvious) if an f/stop is twice that of another one then its 2 stops difference. So f/2.8 is actually 2 stops slower than f/1.4 for example.

    -edit- forgot to answer the actual question ...
    Here's the list of full stops, starting from f/1:

    f/1
    f/1.4
    f2
    f2.8
    f4
    f5.6
    f8
    f11
    f16
    f22
    f32

    A lot of lenses will have as their widest aperture something that isn't actually a full stop (ie f/1.8 or 3.5 etc etc) In this case the next stop is generally the next full stop as listed above.


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