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Canon EOS 6D   Canon EF24-70mm f/2.8L II USM
time:30s  F/4  f=24mm   ISO1000

My hobby is taking photos.

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1P Magic Lantern Dual ISO 100/1600 with ETTR
Canon 6D ，Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:51:15.54  1/50s  F/8.0  f=24mm  ISO 100


 
2P Magic Lantern Dual ISO 100/1600 with ETTR
Canon6D Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:46:40.85  1/40s  F/8.0  f=24mm  ISO 100 



3P Magic Lantern Dual ISO 100/1600 with ETTR
Canon 6D  Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:47:37.09  1/100s  F/8.0 f=35mm  ISO 100 



4P Magic Lantern Dual ISO 100/1600 with ETTR
Canon 6D  Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:48:25.04   1/30s  F/8.0 f=28mm  ISO 100


 
5P Magic Lantern Dual ISO 100/1600 with ETTR
Canon 6D  Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:49:53.35  1/60s  F/8.0 f=42mm  ISO 100




6P Magic Lantern Dual ISO 100/1600 with ETTR
Canon 6D  Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:53:14.68  1/100s  F/8.0 f=50mm  ISO 100



7P Magic Lantern Dual ISO 100/1600 with ETTR
Canon 6D  Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:54:40.82  1/100s  F/8.0 f=31mm  ISO 100




8P Magic Lantern Dual ISO 100/1600 with ETTR
Canon 6D  Canon EF 24-70mm f/2.8L II USM
2014-11-25 09:55:40.11  1/160s  F/8.0 f=24mm  ISO 100

JPG histograms is useless. The RAW histograms is useful.

Thank you Audionut.

Dual ISO 100/800


Dual ISO 100/1600  with ETTR   auto exposure compensation -1.0EV


ISO 100,  no Dual ISO

Dual-ISO @ 100/1600 for life (100/800 to be on the safe side) is all we need...

thank you, yes, 100/800 to be on the safe side.

Dear Audionut:
     Thank you. I use single ISO with ETTR is ok.  I'll try Dual ISO with ETTR.

Yes, I tried to use Dual ISO  with ETTR. But ETTR is always wrong. ETTR reduces exposure compensation -2EV sometimes,why? I don't know. Sometimes is right.In a word,use a combination of inconvenient.

here，I took two photos. One  Exposure compensation is -1EV, but I feel dark. The second Exposure compensation is 0EV. It's very good. So you don't change Exposure compensation. Canon ISO 50, Dual ISO 100/800.

Before sunrise   Canon EOS 6D     EF 24-70mm 2.8L II USM f/4  F=35mm
ISO100  Dual ISO100/800  1/125s  Exposure compensation -1EV 




Sunrise  Canon EOS 6D     EF 24-70mm 2.8L II USM f/4  F=31mm
ISO100  Dual ISO100/800 1/640s   Exposure compensation 0EV