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I was listening to Ben Long videos and he was saying a safe value for shutter speed is 1/focal length So if I have a 35mm prime 1.8 lens, does that mean 1/35 = 0.02 so in my camera panel do the values of shutter speed start as milliseconds? so if it is 20 it means 0.02?

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    \$\begingroup\$ Does What is relationship between focal length and shutter speed? answer your question (in particular, the first answer to that question)? \$\endgroup\$
    – Philip Kendall
    Dec 4, 2014 at 16:10
  • \$\begingroup\$ @PhilipKendall Yes, thanks. But so does 0.02 mean 20 for shutter speed? \$\endgroup\$
    – Brandon
    Dec 4, 2014 at 16:18
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    \$\begingroup\$ In most (every?) camera I've ever used, 20 would mean 1/20s = 0.05s. But as you haven't told us which camera you're using, it's impossible for me to say - and this information should be in the manual anyway :-) \$\endgroup\$
    – Philip Kendall
    Dec 4, 2014 at 16:23
  • \$\begingroup\$ @PhilipKendall Nikon D-610 \$\endgroup\$
    – Brandon
    Dec 4, 2014 at 16:27
  • \$\begingroup\$ Also see Where does the ¹/shutter speed = focal length rule for hand shake come from?, although I don't think that's your question. \$\endgroup\$
    – mattdm
    Dec 4, 2014 at 18:08

2 Answers 2

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Your calculations are wrong: 1/35 is 0.03 seconds and you can use 1/30 sec. (as standard setting and very close to 1/35) If you see 20 this mean 1/20 of the second. And with such speed there is probability you make blurry photos

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  • \$\begingroup\$ so 1/30 sec .. then what Number does that mean on the camera panel for shutter speed? \$\endgroup\$
    – Brandon
    Dec 4, 2014 at 18:09
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    \$\begingroup\$ Blake, this (1/30) of the second will be displayed on the camera viewfinder or liveview panel as number 30. In case your speed is in seconds will be displayed as 30' \$\endgroup\$ Dec 4, 2014 at 19:33
  • \$\begingroup\$ awesome. That's what was confusing me as I was trying to convert that 1/30 to some other number on the viewfinder. Thanks. \$\endgroup\$
    – Brandon
    Dec 4, 2014 at 20:07
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It's actually even easier than that, since times below 0.3 seconds are commonly displayed as fractions of a second. So, "20" would be 1/20 second. Since you have a 35mm lens, that would correspond to 1/35 second or "35" (or the next higher available number). No need to go decimal here, just stay with fractions :)

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  • \$\begingroup\$ so on my camera panel when it shows number 20, does that mean 20/100 of a second? or 20/1000 of a second ? \$\endgroup\$
    – Brandon
    Dec 4, 2014 at 18:10
  • \$\begingroup\$ as i said, 1/20. which is 0.05 or 5/100 or 50/1000, but this seems rather useless info. \$\endgroup\$
    – ths
    Dec 4, 2014 at 18:11

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