I was asked by Richard to post the results of my Nikon tests here .
I did some
tests on Nikon's TTL/BL and came up with some interesting results which prove
the official thread on TTL/BL wrong ! The author of that site refuses to accept my results because he has been teaching the 'old TTL/BL' for so long he doesn't want to admit that it changed way back with the D100 !
I also did a
recently to help explain the results of my tests along with a
metering .
And my latest video on an interesting look at
because it is checking the exposure meter to decide on what its output should be !
hey Desmond, it's Richard here.
Thank you very much for posting your test results here. Desmond has spent a lot of time and effort on testing how the TTL/BL system work and his result is very interesting and different to the previous "ttl guide" i've posted on the other thread.
Everyone should read Desmond's articles and watch the video as well. It'll definitely help you understand how the Nikon TTL/BL actually work.
Once again, thank you for sharing this valuable info with us!
(09-16-2009 03:46 PM)yellow15 Wrote: [ -> ]hey Desmond, it's Richard here.
Thank you very much for posting your test results here. Desmond has spent a lot of time and effort on testing how the TTL/BL system work and his result is very interesting and different to the previous "ttl guide" i've posted on the other thread.
Everyone should read Desmond's articles and watch the video as well. It'll definitely help you understand how the Nikon TTL/BL actually work.
Once again, thank you for sharing this valuable info with us!
Hey Richard , no problem !
I've discovered a few more interesting things that may make TTL/BL flash totally predictable in future ! Still got to do a video on it though !
THank you Desmonds.
So in a nutshell.
TTL/BL - Uses distance from the lens when pointed forward and meters off all focus points.
TTL - Meters off centre of the frame.
CLS uses TTL/BL.
Thanks for the Youtube Video, it was an interesting watch!
Which cameras have TTL/BL?
(09-16-2009 09:01 PM)ArcspacE Wrote: [ -> ]Which cameras have TTL/BL?
Its mainly used on speedlights. There is an option to use M, TTL or TTL/BL.
(09-16-2009 08:51 PM)CTM Wrote: [ -> ]THank you Desmond.
So in a nutshell.
TTL/BL - Uses distance from the lens when pointed forward and meters off all focus points.
TTL - Meters off centre of the frame.
CLS uses TTL/BL.
Thanks for the Youtube Video, it was an interesting watch!
And to add to that TTL thinks it is the only light source so you have to dial in negative compensation when you expose the ambient correctly outdoors .
TTL/BL 'watches your meter' so that if you have underexposed the ambient in manual by one stop - it reacts by firing one stop brighter ! If your exposure for the ambient is correct it hardly fires at all .
I did separate slideshow on TTL/BL and metering based on my most recent tests explaining
.
(09-16-2009 09:01 PM)ArcspacE Wrote: [ -> ]Which cameras have TTL/BL?
All the Nikons have TTL/BL but not all lenses have distance info .
Originally the distance info was invented for in case the pre-flash reading was messed up due to bright sunlight but as mentioned it only works for direct flash .
BUT: Your built in speedlight meters in TTL/BL mode , the SB400 only works in TTL/BL mode and wireless "TTL" is actually metering in TTL/BL mode .
So it looks like TTL/BL is the way of the future and TTL will be similar to "A" mode where most people use it only because they have gotten used to it .
(09-17-2009 04:59 AM)Desmond Wrote: [ -> ]So it looks like TTL-BL is the way of the future and TTL will be similar to "A" mode where most people use it only because they have gotten used to it .
it sounds logical. TTL (-BL) is suppose to be the automatic/smart flash mode. With the original design, I found it a bit weird and awful that you have to manually switch between the TTL and TTL-BL mode depends on whether the background is brighter than the object or not. Sometime it gets a bit tricky or you may forgot to switch to the correct mode especially when you are shooting outdoor events like weddings.
So it would be great if TTL-BL will become the new "standard" flash mode as it is a lot more intelligent than the traditional TTL (or iTTL or eTTL whatever you called) system
(09-17-2009 07:55 AM)yellow15 Wrote: [ -> ] (09-17-2009 04:59 AM)Desmond Wrote: [ -> ]So it looks like TTL-BL is the way of the future and TTL will be similar to "A" mode where most people use it only because they have gotten used to it .
it sounds logical. TTL (-BL) is suppose to be the automatic/smart flash mode. With the original design, I found it a bit weird and awful that you have to manually switch between the TTL and TTL-BL mode depends on whether the background is brighter than the object or not. Sometime it gets a bit tricky or you may forgot to switch to the correct mode especially when you are shooting outdoor events like weddings.
So it would be great if TTL-BL will become the new "standard" flash mode as it is a lot more intelligent than the traditional TTL (or iTTL or eTTL whatever you called) system
Basically I will always be in TTL/BL mode in future because it is more consistent and 'intelligent' - you just have to learn how and why it does certain things and it will be more reliable than TTL flash .