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[OM] Re: Dr. Flash reports on Will Crockett's DVD flash tutorial

Subject: [OM] Re: Dr. Flash reports on Will Crockett's DVD flash tutorial
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 28 Jun 2008 22:49:23 -0400
I didn't mention it but Crockett would also say that certain camera 
bodies essentially do not function in TTL.  For Canon the 10D and 20D do 
nor work reliably in TTL.  Later bodies do work but, of course, only 
when TTL is the main light.

Dr. Flash

C.H.Ling wrote:
> Talking about Canon flash, it is the poorest flash system I have ever used, 
> even the old Olympus T-flashes are better (I once tested my T32 in TTL mode 
> was around +/- 0.3 stops from 3 to 15 feet). The most reliable flash I have 
> ever used was the FL50 in auto mode, in TTL mode it suffered from under 
> exposure with strong reflection objects (mirror.. etc.) inside the frame. My 
> Canon 430EX is consistently 2/3 to 1 1/3 stop under in TTL mode, may be I 
> have used non original Canon lenses but they are both latest design from 
> Tamron (17-50 and 70-300 LD Macro 1:2) and there is no excuse for such big 
> error. The 430EX also has no auto mode and only provide 1/2, 1/4... half 
> stop manual mode, compared with FL36 it is highly overpriced.
> 
> 
> C.H.Ling
> 
> ----- Original Message ----- 
> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> 
>> Canon and Nikon also use distance data.  Nikon has apparently used it
>> for a long time and Canon more recently with its E-TTL II which also
>> requires specific lenses with distance encoders.  As to why distance
>> alone is not the sole exposure determinant I point you to this excellent
>> article on Canon flash and the logic (or illogic) behind it.  See the
>> sections on E-TTL and E-TTL II near the middle of the page.
>> <http://photonotes.org/articles/eos-flash/index.html>
>>
>> I guess I would be very surprised if E lenses do not also provide
>> distance data to the camera for flash power computation.
>>
>> Dr. Flash
> 
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