Archived posting to the Leica Users Group, 2002/04/07

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Subject: RE: [Leica] Leica TTL accuracy.
From: "James Harrison" <leicajh@earthlink.net>
Date: Sun, 7 Apr 2002 9:38:44 -0500

Did you have film in the cameras when you tested the flash TTL?  jh


> [Original Message]
> From: Henry Ting <henryting10@yahoo.com>
> To: Leica-users <leica-users@mejac.palo-alto.ca.us>
 > Date: 4/7/2002 1:19:21 AM
> Subject: [Leica] Leica TTL accuracy.
>
> 
> About a month ago, I added a Metz 54 MZ-3 to the M6
> with different modules for the M6 and R6.2 TTL.
> The initial results were disappointing. I tested it
> with close to 18% neutral background and in all
> situations with both TTL and the automatic all my
> pictures came out underexposed. I made addtional tests
> with the flash, but metering it with the flash mode of
> the Sekonic L-3088 and sure enough the Metz screen
> shown with the distance to F-stop is one-stop under
> compared to the Sekonic meter reading. However, using
> FULL flash with no TTL or auto mode, the flash output
> in combination with the zoom capability shows exactly
> 177 GN against the meter with the appropriate
> flash-to-subject distance.
> 
> I'm at a lost in trying to determine the source of
> this problem. My understanding is the flash output is
> determined by the camera in TTL mode, so logically the
> under-exposure problem should lie with my camera.
> However, in auto-mode, the control is in the flash and
> yet the pictures are also under-exposed, so logically
> the problem should be with the flash. And yet testing
> the flash in FULL manual, the Sekonic reads the output
> as "right on". By the way, the under-exposure is
> consistent with both my M6-TTL and the R6.2 with Metz
> modules SCA 3502 and SCA 351 respectively.
> 
> I ran out of ideas in trying to trouble-shoot this
> problem. I could use the Metz 54 MZ-3 with the +1
> compensation to overcome this, but that's a big price
> to pay. 
> 
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- --- James Harrison
- --- Wichita Falls Texas, USA
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