OMD severe flash exposure problem

Started Apr 11, 2013 | Discussions thread
Alumna Gorp
Senior MemberPosts: 1,531Gear list
Like?
Re: iso100 to iso200 = 1.4 factor, recalculating
In reply to 007peter, Apr 26, 2013

007peter wrote:

I google the answer, according to this website

  • increasing film speed from 100 to 200 increases GN by a factor of 1.4 
  • this means to covert OMD's iso200 into iso100, we divide by 1.4
  • OMD Guide number of 10m @ ISO 200 (divide by 1.4 for iso100) = 7.14m

So in reality, the comparable figure converted to standard iso100 are:

  • OMD Guide number of 7.14m @iISO 100 (converted)
  • 50D Guide number of 13m @ ISO 100 vs

Canon 50d buildin flash is almost twice as powerful.

Yes you are right, i made a booboo and divided by 2.

 Alumna Gorp's gear list:Alumna Gorp's gear list
Fujifilm X10 Panasonic Lumix DMC-G2 Panasonic Lumix DMC-GF2 Olympus OM-D E-M5 Panasonic Lumix G 14mm F2.5 ASPH +4 more
Reply   Reply with quote   Complain
Post (hide subjects)Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow