View Poll Results: Which one is correct?

Voters
124. You may not vote on this poll
  • 1/ (focal length)

    58 46.77%
  • 1/ (focal length x crop factor)

    66 53.23%
Page 1 of 4 123 ... LastLast
Results 1 to 20 of 70

Thread: POLL: 1/focal length rule

  1. #1
    Senior Member +evenstar's Avatar
    Join Date
    Jan 2004
    Location
    Singapore / United Kingdom
    Posts
    5,655

    Default POLL: 1/focal length rule

    Which do you think is the correct choice for this rule?
    eat. drink. shoot

  2. #2

    Default

    use "1/resultant focal length" if u want to play safe.

  3. #3
    Senior Member
    Join Date
    Jan 2002
    Location
    Singapore
    Posts
    12,938

    Default

    1/ (focal length x crop factor) is more accurate. but this is just a guide. everyone's different.

  4. #4
    Member patch17's Avatar
    Join Date
    Jun 2003
    Location
    here and there
    Posts
    728

    Default

    Quote Originally Posted by +evenstar
    Which do you think is the correct choice for this rule?
    it's not a rule, just a guide. i use 1/focal lenght to get a general idea but have gotten good shots using slower speeds as well.
    Today is a gift; that's why it's called the present.
    The toys

  5. #5
    Member
    Join Date
    Aug 2002
    Location
    Singapore
    Posts
    293

    Default

    hmmm, interesting question.

    what about those who are shooting in medium or large format? is it (1/equivalent of 35mm focal length) ?

    hehehehe...have a merry xmas!

    cheers
    Andrew

  6. #6

    Default

    the rule/guide only applies to 35mm format. if you are using dslr, its the 1/focal length x crop factor.

  7. #7
    Moderator
    Join Date
    May 2002
    Location
    Melbourne, Australia
    Posts
    4,026

    Default ignore the crop factor in the equation....

    Quote Originally Posted by BurgaFlippinMan
    the rule/guide only applies to 35mm format. if you are using dslr, its the 1/focal length x crop factor.
    Crop factor here is just the media capture area.......

    rgds,
    sulhan

  8. #8
    Member
    Join Date
    Jan 2002
    Location
    Bukit Batok West Avenue 2
    Posts
    1,734

    Default

    Well, just think of all those prosumers with those tiny sensor and huge crop factor, you think you can avoid camera shake at it's 200mm equivalent focal length by using 1/50 shutter speed b'cos it's actual focal length is around 50mm?

    Perhaps due to the enlargement of the image, any defects due to camera movement are also enlarged similarly, thus requiring to take this crop factor into consideration?


    Anyway, the 1/focal length is just a rough guide for 35mm photography...

  9. #9
    Member
    Join Date
    Oct 2004
    Location
    Singapore, Simei
    Posts
    289

    Default

    I don't have a steady hand.. and when i shoot my D70+Sigma70-300APO is actually moving up down left right by 5-7mm.. But the image is sharp when enlarged 100% at 1/160 300mm ...once i change to any shutter lower can see movement liao.. 160 seem to be the lucky number..

  10. #10

    Lightbulb

    Quote Originally Posted by kh_drew
    hmmm, interesting question.

    what about those who are shooting in medium or large format? is it (1/equivalent of 35mm focal length) ?

    hehehehe...have a merry xmas!

    cheers
    Andrew
    as a guide, it should (1/their focal length). have not seen anyone using large format cameras handheld?

  11. #11

    Default

    1/((focal length * crop factor)/3).

    Get IS.

  12. #12

    Lightbulb

    care to explain?

  13. #13

    Default

    i think the rule is shoot at the speed which you can handhold without shaking some people who follow the 1/focal length rule still can't get their technique right to hand hold properly which is the more important thing.

  14. #14

    Default

    Quote Originally Posted by sulhan
    Crop factor here is just the media capture area.......

    rgds,
    sulhan

    same thoughts, and the lens you use for 35mm x1.6 or not is the same. so I personally ignore the crop factor.

    i dun like to compare against digicams cos the lens size used is not the same as SLR.

    compare apples to apples

    and the most important factor is to get your techique right, that these 'rules' can be broken as well.
    Last edited by Belle&Sebastain; 24th December 2004 at 12:36 PM.

  15. #15

    Default

    Quote Originally Posted by Belle&Sebastain
    i dun like to compare against digicams cos the lens size used is not the same as SLR.
    Lens size is not an issue, focal length is. A 50mm lens on a digicam would have the same magnification on a SLR if it could be fitted, albeit with vignetting.

    Most digicams have a FOV crop factor of 4.x. So a 50mm gives a 200mm FOV. I don't think anyone gets reliable decent results at 200mm 1/50 with those cameras.

    compare apples to apples
    No longer possible when DSLRs and SLRs are different both in imager size and CoC. It's akin to comparing a medium format to a 35mm in this case.

    and the most important factor is to get your techique right, that these 'rules' can be broken as well.
    Agree.

  16. #16

    Default

    1/(35mm equivalent focal length)

    and of course there's IS/VR/AS

  17. #17
    Member
    Join Date
    Aug 2004
    Location
    www.whltelightphotographer.com
    Posts
    1,834

    Default

    Quote Originally Posted by reachme2003
    as a guide, it should (1/their focal length). have not seen anyone using large format cameras handheld?
    Done it at 1/125 and still sharp with my crown graphic will a rodenstock 150mm lens

  18. #18

    Default

    Quote Originally Posted by Zerstorer
    Lens size is not an issue, focal length is. A 50mm lens on a digicam would have the same magnification on a SLR if it could be fitted, albeit with vignetting.

    Most digicams have a FOV crop factor of 4.x. So a 50mm gives a 200mm FOV. I don't think anyone gets reliable decent results at 200mm 1/50 with those cameras.


    No longer possible when DSLRs and SLRs are different both in imager size and CoC. It's akin to comparing a medium format to a 35mm in this case.


    Agree.

    anyway its my own thoughts, i bo chap (do not care) this type of things one, the image is more important than this.
    Last edited by Belle&Sebastain; 24th December 2004 at 01:26 PM.

  19. #19

    Default

    Quote Originally Posted by sulhan
    Crop factor here is just the media capture area.......

    rgds,
    sulhan
    Actually even Minolta programmed the Dynax 7 Digital to use the 1/focal length x crop factor rule.

    When using flash in aperture priority, the camera shutter speed is locked at shutter speed of 1/focal length x crop factor of slightly bigger than 1.5. You can check the difference between your 7D and your film 7, which follows the 1/focal length rule.

    Cheers!

  20. #20

    Default

    Anyway, I always uses 1/focal length becoz the multipler is just like a crop factor. If you shoot exactly at 1/focal length and crop at multiplication of factor using PS, I am sure you dun see blur motion either. Unless the general /focal length rule is wrong in the first place..

Page 1 of 4 123 ... LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •