Archived posting to the Leica Users Group, 2003/03/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]As you have already found out, you need film in the camera for it to work properly. The flash metering cell measures light reflecting off the film. If you have no film in, it measures the light reflected off the camera's black pressure plate. The black pressure plate reflects less light than the lighter film and so the flash metering cell is unable to get enough light to signal a correct exposure. John Collier On Saturday, March 8, 2003, at 01:48 PM, Ernest Nitka wrote: > I have an M7 with the SF 20 flash unit - I 'm not sure it's working or > that I know what I'm doing. I don't do much flash work which is why I > need help. > > i attache the SF 20 to the M7 , turn both on with the SF20 being set > to TTL. Camera has no film in it so it defaults to ISO 100 I would > suspect. My question is that when i shoot towards a wall of books > abut 8 feet away at f/4 neither the SF20 or the M7 indicate that it > was an adequate exposure ( the flash icon goes away immediated and the > 'ok' LED on SF 20 does not lite up) the SF20 is set on f/4. why is > this because prior to shooting the SF20 says i should be ok up to 16 > feet ( GN=66/4 =~ 16). I have to open up to f/2.8 to get both the > SF20 and M7 to say that there was adequate exposure. What am I doing > wrong? - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html