[Leica] Advice sought: - TTArtisan Light Meters

[Peter Dzwig]

Martin,

of course you are right and there are differences at the margins.

However if I shoot film, digital and Sunny 16 at a given presumed 
ISO/ASA, then the standards imply though there is some margin for error, 
that the resulting exposures should be very similar if not match.

This is at root why I was asking because all three should yield pretty 
similar results.

The least reliable is likely to be Sunny 16 given that what constitutes 
what scenario is pretty subjective.

I would have thought (?),

Peter

On 11/08/2025 14:49, Marty Deveney via LUG wrote:
> The digital photography ISO speed is described in ISO standard 12232.  The
> relationship between light incoming and speed is largely arbitrary for
> digital sensors.  For film, the ISO standard is ISO 5800:2001 for colour
> negative film, ISO 6:1993 for black and white negative film and ISO
> 2240:2003 for colour reversal film.  The standards for film are
> chemico-physically defined as a given amount of illuminance range, combined
> with a given exposure and a given development gives a defined negative or
> positive output.  The largely arbitrary standard for digital means that
> even when the light is the same how the meters describe the light in terms
> of time and aperture is different.
> 
> On Mon, Aug 11, 2025 at 10:52 PM Adam Bridge via LUG <lug at leica-users.org>
> wrote:
> 
>> I have no idea how film and digtal light meters should be different.
>>
>> Is there a reason for this? Light that lands on the sensor, to my aged
>> brain, seems to be the same where it’s landing on film or on silicon.
>>
>> Adam Bridge
>>
>>
>>> On Aug 11, 2025, at 2:11 PM, Marty Deveney via LUG <lug at leica-users.org>
>> wrote:
>>>
>>> Peter, the ISO standards for film and for digital light meters are
>>> different.  The two meters also measure light very differently.  Have you
>>> compared it to a film camera or a hand held meter?  Or tried using it to
>>> shoot film?
>>>
>>> I have not tried the TTA meter but use a Keks KMQ meter
>>> https://www.kekscameras.com/store/p14/KEKSKMQLightmeter.html#/ and it
>> works
>>> really well.
>>>
>>> Marty
>>>
>>>
>>>
>>> On Mon, Aug 11, 2025 at 9:40 PM Peter Dzwig <pdzwig at summaventures.com>
>>> wrote:
>>>
>>>> Thanks mark! You are the only person on the LUG saying they use one. Do
>>>> you think it could be faulty?
>>>>
>>>> Peter
>>>>
>>>> On 09/08/2025 17:09, Mark Kronquist via LUG wrote:
>>>>> I have and use several they are fine  Mark in Oregon
>>>>>
>>>>>> On Aug 9, 2025, at 4:59 AM, Peter Dzwig <pdzwig at summaventures.com>
>>>> wrote:
>>>>>>
>>>>>> All,
>>>>>>
>>>>>> thank you for all your replies. Fascinating. The one thing that they
>>>> have in common is that it appears that no-one uses TTArtisan meters,
>> which
>>>> must say *something*.
>>>>>>
>>>>>> Peter
>>>>>>
>>>>>> On 07/08/2025 11:19, Peter Dzwig wrote:
>>>>>>> Dear All,
>>>>>>> Does anyone have any experience of these meters? I though that they
>>>> had a good reputation, but see below...
>>>>>>> I bought one (Series 2) because I wanted to test my M3 (my Weston Mk
>> V
>>>> has finally stopped working properly). I normally shoot "Sunny 16", but
>>>> have been getting some odd results of late and wanted to understand if
>> it
>>>> was me, developing or what.
>>>>>>> I was comparing what I would expect to get from Sunny 16 with my Fuji
>>>> XE-2 and the LM. I tested in a variety of light levels and degrees of
>> shade.
>>>>>>> To my amazement the LM and the other exposures agreed on only one
>>>> occasion, when I was pointing the LM and the XE-2 at a white wall in
>> full
>>>> Mediterranean sunlight (seriously f22)! Otherwise they were miles apart.
>>>>>>> Both XE-2 and LM were set to 400ASA. When I shot the scenes with the
>>>> XE-2 the images were, in general, fine.
>>>>>>> Anyone any thoughts/explanations? Of course the XE-2 has a zoned
>>>> meter, but still...
>>>>>>> Thanks in advance
>>>>>>> Peter
>>>>>>> PS If anyone knows of someone in the UK who can replace the cell in a
>>>> Weston V, please let me know
>>>>>>
>>>>>> --
>>>>>> Dr. Peter Dzwig
>>>>>>
>>>>>>
>>>>>> _______________________________________________
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>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Leica Users Group.
>>>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>>>
>>>> --
>>>> Dr. Peter Dzwig
>>>>
>>>>
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>>>
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-- 
Dr. Peter Dzwig