Thomas Bantel wrote:
> Oops, yes, you're right. Some EOS lenses don't transmit *focusing distance*, > but I think all of them do transmit their FL. The question remains, what > *exactly* do they transmit? The FL as marked on the zoom ring/lens barrel > or the *true* focal length they have at the actual focusing distance? These > can be substantially different, due to the optical design of most EOS lenses. > Most of them change (decrease) their focal length at close focusing distances. Thomas, They would need the lens focal length in order to set the flash. There have been many threads about the focusing distance, with respect as to why Canon doesn't use it to set the flash exposure like Nikon. I cannot remember what the consensus of opinion was, but it will be in the archives. Cheers Keith --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.552 / Virus Database: 344 - Release Date: 15/12/2003 * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
