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DPChallenge Forums >> Rant >> Damn Imperial measurment system anyway!!!
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Showing posts 1 - 12 of 12, (reverse)
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 05/07/2007 02:37:13 AM · #1
Hehe.. I wish the people *not* on the metric system would get in gear already.

I had a minor panic attack a little while ago after looking at some comparisons and seeing flash units from Nikon and Canon seemingly having HUGE Guide Number advantages over the $450 Pentax flash I just got..

what I read was:

Canon 580EX - GN of 180 @ ISO 100

Nikon SB-800 - GN of 125 @ ISO 100

Pentax AF540FGZ - GN of 54 @ ISO 100

I panicked. Why is Pentax so LOW!?!?!?!?

Then, after some frantic searching, I found the cause.

The Pentax is the only one giving the Guide Number in *METERS*.

The other two are in Feet. HAH.

Crazy people and their feet. :P Making your stuff sound *SOOO* impressive.

05/07/2007 02:41:22 AM · #2
wait a second... you mean the GN on flashes is not standardized to use only feet?

edit to add: no wonder nikon and canon is selling more flash units, lol

Message edited by author 2007-05-07 02:41:57.
 05/07/2007 02:45:39 AM · #3
Originally posted by crayon:
wait a second... you mean the GN on flashes is not standardized to use only feet?

edit to add: no wonder nikon and canon is selling more flash units, lol


Apparently not. The manual for Pentax clearly states the GN is in meters. So do all the specification read-outs on various websites I looked at.

Some of the websites give Canon's in meters too.. which is 58. (60 if you go by 3 ft/m exactly.)
 05/07/2007 02:47:40 AM · #4
Originally posted by Artyste:
The Pentax is the only one giving the Guide Number in *METERS*.

Silly Pentax people. Everyone knows that meters are test instruments.

05/07/2007 02:59:14 AM · #5
Originally posted by Artyste:


Some of the websites give Canon's in meters too.. which is 58.


That's why they call it 580 EX...
 05/07/2007 03:04:10 AM · #6
Originally posted by eyewave:
Originally posted by Artyste:


Some of the websites give Canon's in meters too.. which is 58.


That's why they call it 580 EX...


Ooops.. my mistake. Never mind.

Interesting.

Message edited by author 2007-05-07 03:05:34.
 05/07/2007 04:58:54 AM · #7
Originally posted by Artyste:

Some of the websites give Canon's in meters too.. which is 58. (60 if you go by 3 ft/m exactly.)


Why would you go by 3ft/m exactly when it's 39.37in/m?
 05/07/2007 02:15:56 PM · #8
Originally posted by BeeCee:
Originally posted by Artyste:

Some of the websites give Canon's in meters too.. which is 58. (60 if you go by 3 ft/m exactly.)


Why would you go by 3ft/m exactly when it's 39.37in/m?


Because some people round it off for convenience ;)
 05/07/2007 02:44:08 PM · #9
Originally posted by BeeCee:
Originally posted by Artyste:

Some of the websites give Canon's in meters too.. which is 58. (60 if you go by 3 ft/m exactly.)


Why would you go by 3ft/m exactly when it's 39.37in/m?


Actually the foot is now officially defined in terms of metric units as being 0.3048 meters.

BTW, the metre is defined as the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second. This definition assumes that the speed of light is a constant 299,792,458 metres/second.
 05/07/2007 02:57:11 PM · #10
Originally posted by Spazmo99:
Actually the foot is now officially defined in terms of metric units as being 0.3048 meters.

BTW, the metre is defined as the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second. This definition assumes that the speed of light is a constant 299,792,458 metres/second.


you've never had a lot of dates, have you? :P
 05/07/2007 04:15:58 PM · #11
Originally posted by muckpond:
Originally posted by Spazmo99:
Actually the foot is now officially defined in terms of metric units as being 0.3048 meters.

BTW, the metre is defined as the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second. This definition assumes that the speed of light is a constant 299,792,458 metres/second.


you've never had a lot of dates, have you? :P


No, not since I got married.
 05/07/2007 04:32:25 PM · #12
Originally posted by Spazmo99:

No, not since I got married.


:-D As everyone knows, men don't get hobbies til after they are married.
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