Archived posting to the Leica Users Group, 1999/02/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- -----Original Message----- From: Malcolm McCullough <blayne@mbox2.singnet.com.sg> To: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us> Date: Tuesday, February 16, 1999 1:46 AM Subject: Re: [Leica] Leica M5(metering) > >>Osterloh in his Leica M book compares the M5 and M6 metering systems. >>Accordingly,and here I copy his Table from p. 41: >> M6 >>M5 >> >>Diameter of measuring spot 12mm 8.5mm >> >>Measuring range(cd/m^2) 0.25-32000 0.06-32000 >> >>Exposure values >> 1--18 -1--18 >> >> >>Clearly, the CdS meter of the M5 is more sensitive than that of the M6. > >Are these measured with an f2 lens? The M6 officially measures to EV-1 with >the Noctilux and 100 ASA film (ie 0.06cd/m^2) though I find the meter to be >more sensitive in practice. >Because it is a TTL meter, I think that it is more informative to quote ASA >and shutter speed. So you would quote the M6's sensitivity as 1/2 sec with >100 ASA film. The f-stop doesn't matter, so the EV is meaningless. Does >anyone agree with me? Does anyone see what I am trying to get at? > >Regards, >Malcolm > Actually, you need to express EV with film speed (typically 100 ASA is used) AND the lens' largest F-stop (typicall 50mm F1.4). The EV range is dependant on both. Mark Hammons