Basing a flash exposure on distance says you're using direct flash
illumination. Ugh. Double ugh!! Use a flash meter or the histogram or
both.
Dr. Flash
On 6/17/2012 10:20 PM, usher99@xxxxxxx wrote:
> CN writes:
>> I see that the terminology has been carried over to Sony DSLRs with
> the
>> A900 having 40 segments. But the A900 manual makes no mention of
>> distance integration perhaps because many lenses don't pass distance
>> data. The A1 with its integrated 28-200mm equivalent lens does know
>> focusing distance and the sensor based exposure system can have lots
>> more segments. By the time we get to the NEX-7, however,
>> "multi-segment" has morphed into "multi-pattern" and again there is no
>> mention of distance.
>
>
> FWIW Canyon first started introducing lenses with distance encoders in
> 1990 along with the Eos 10S. The exact specs are kept under their hat
> but Chuck Westfall thinks the distances
> provided to the cam often were rather approximate. Not ever lens
> reports this but almost all USM ones now do.
> ETTL-II uses the focus distance for flash metering (not that is spot on
> most the time). Oddly they took out reporting focusing distance in
> EXIFfor the 5D classic
> though previous models did this No Canyon software apparently required
> it. DLO in DPP does use it now but provides a slider for focus
> distance if it is not reported.
> Have never become enamored of ETTL-2 but wished I could use it with
> modifiers for macro /macro fill but it isn't that great then either.
>
> Student of Dr. Flash, Mike
>
>
>
>
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