Camera Shake ~ Shutter Speed = Focal Length?

Discussion in 'Photography Beginners' Forum' started by prodigy2k7, Jun 23, 2008.

  1. prodigy2k7

    prodigy2k7 No longer a newbie, moving up!

    Joined:
    Apr 22, 2008
    Messages:
    1,665
    Likes Received:
    22
    Location:
    California, USA
    Can others edit my Photos:
    Photos OK to edit
    Ive heard that to counter camera shake without a tripod using shutter speed, you must have the same or faster speed than the focal length of the lens.
    Example: 75-300mm lens, zoomed to 300mm, you should use atleast 1/300 right?

    I heard that only works sometimes, so, how do you know the minimum speed you should use?
     
  2. keith204

    keith204 No longer a newbie, moving up!

    Joined:
    May 20, 2007
    Messages:
    1,643
    Likes Received:
    2
    Location:
    Bolivar, MO
    Can others edit my Photos:
    Photos OK to edit
    That's a great rule of thumb. However, that's given in 35mm lengths, so with a crop sensor, multiply by 1.6. So, at 300mm on a crop camera, try for something near 1/480 second.

    IMO that's usually pretty conservative and you can get by with slower.
     
  3. reg

    reg TPF Noob!

    Joined:
    May 28, 2008
    Messages:
    1,487
    Likes Received:
    1
    Location:
    Stuck inside of Mobile with the GTFO Blues Again
    Can others edit my Photos:
    Photos OK to edit
    Care to show me a reputable source that says that crop factor has to do with camera shake?

    Crop factor only has to do with field of view(and since crop factor is due to a less than x sized sensor, often 35mm, there are also issues with DOF and noise). I wish it wasn't perpetrated as being some kind of universal rule-changer.

    But even the "rule of thumb" is invalid if you have surgeon's hands or are in the middle of a seizure.
     
  4. keith204

    keith204 No longer a newbie, moving up!

    Joined:
    May 20, 2007
    Messages:
    1,643
    Likes Received:
    2
    Location:
    Bolivar, MO
    Can others edit my Photos:
    Photos OK to edit
    Are you wanting to start up another pointless fight? :D Google it, almost anywhere that camera shake rule of thumb comes up, it mentions crop factor. If I mentioned sources, we'd debate which sources were "reputable".

    Right, that's why it's a rule of thumb...
     
  5. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

    Joined:
    May 1, 2008
    Messages:
    23,103
    Likes Received:
    3,767
    Location:
    UK - England
    Can others edit my Photos:
    Photos OK to edit
    Yes it a good rule of thumb to follow =- the other half is to perfect shooting stance.
    There are many ways to do this, here are a few:
    1) crouch down into the prone position (keep on foot on the ground and bend the knee- with the other leg place the knee on the ground - like shooting a gun.)

    2) breathing - a host of tips - though apparently you should press the shutter button at the very end of exhaling - there is a natural pause there.

    3) look about for a wall, post, fence, etc to either lean yourself on or to lean the camera on
     
  6. Helen B

    Helen B TPF Noob!

    Joined:
    Sep 16, 2007
    Messages:
    3,296
    Likes Received:
    465
    Location:
    Hell's Kitchen, New York
    Can others edit my Photos:
    Photos NOT OK to edit
    As already mentioned, it is a good rule of thumb (that does depend on format), but there are times when you can use a slower shutter speed and times when you should use a faster shutter speed.

    If you want ultimate sharpness it may not be fast enough - the effects of shake are not always obvious unless you put two images made with a high quality lens side by side at high magnification.

    Best,
    Helen
     
  7. sultan

    sultan TPF Noob!

    Joined:
    Mar 5, 2008
    Messages:
    302
    Likes Received:
    0
    Location:
    Mississauga, Ontario, Canada
    Can others edit my Photos:
    Photos OK to edit
    Thats the rule of thumb. It's a bit conservative and doesn't take IS into account. I say that you can ignore the crop factor because of it's conservatism. With, IS, you can go to half the speed (2x the time) easily and still be perfectly sharp.
     
  8. RyanLilly

    RyanLilly No longer a newbie, moving up!

    Joined:
    Aug 27, 2007
    Messages:
    1,478
    Likes Received:
    8
    Location:
    St. Louis, Missouri, USofA
    Can others edit my Photos:
    Photos NOT OK to edit
    I usually find that I can shoot at much slow shutter at short focal lengths and my shutter speed requirement goes closer to the rule of thumb as focal length increases.
     

Share This Page

Search tags for this page
camera focal length crop speed
,
camera shake
,
camera shake focal length times 2
,

camera shake rule

,

camera shake rule of thumb

,
camera shake rulew
,
how to counter camera shake
,
shutter speed and camera shake
,
shutter speed half of focal length
,

shutter speed shake