+and - EV
Mar 27, 2017 16:50:35 #
lamiaceae wrote:
b There you go. You knew where I was going. /b ... (show quote)
Water and ice look blue due to absorption of red and green. Dive to 10 meters, and the only light left is blue.
The "blue is cold" almost certainly comes from that. Water faucets are often color-coded blue and red by the same analogy. I don't have any qualms about blue being cold below room temperature, and red being hot between 100F and the point where the Kelvin scale applies to color temperature (where it's "relatively cool" but describes "warm" colors...). It is a mixed up world.
Too bad we don't do a better job of teaching science.
They're only called Kelvins as an honorarium (and it's hard to type the degree symbol on many keyboards --- including this iPhone). The scale is the same as Celsius, but 0C is 273K.
Mar 27, 2017 17:04:02 #
Mar 27, 2017 17:10:14 #
a6k
Loc: Detroit & Sanibel
jimvanells wrote:
I think that comment means your center focus point has a dynamic range of 6 stops. If you exposure is in that range the camera can focus accurately. I have mine set to "no focus, no exposure". I also shoot in manual and keep the exposure meter in the bottom of the viewfinder. I have had my 5d4 for a month and am still working out the details myself. Other Hoggers with more experience, if I'm off base, please let us know.
Although the OP considers this the correct answer, I think that Canon is saying that an actual EV of -3 is the lowest the center spot can function. This is not referring to a relative EV but an actual (absolute?) EV. In the picture of the light meter app on the iPhone it shows an EV of 9 for example. A typical sunny day in the mid-latitudes will go as high as 15. I am 99.999% certain that the light meter in the camera is able to handle a lot more than a DR of 6 stops. Each EV is one stop if I recall correctly.
If you have a phone that can do it, that app is a very good addition. I use it, too.
Mar 27, 2017 17:33:34 #
a6k wrote:
Although the OP considers this the correct answer,... (show quote)
Thank you. I think I just confused EV with Exposure Compensation.
Mar 27, 2017 18:28:47 #
catchlight..
Loc: Wisconsin USA- Halden Norway
speters wrote:
Its just a statement at what level (light) the camera is still able to achieve focus!
Exactly...the manual is obviously not written for beginners. The use of the EV scale may be unknown if you are starting out or a casual shooter.
Mar 27, 2017 18:50:22 #
catchlight.. wrote:
Exactly...the manual is obviously not written for beginners. The use of the EV scale may be unknown if you are starting out or a casual shooter.
Well, I'm not a beginner, and I at least read the manual. I just got confused on (1) sentance. To say you must be a beginner if you don't understand something is not at all accurate.
Mar 27, 2017 19:00:51 #
catchlight..
Loc: Wisconsin USA- Halden Norway
Tracy B. wrote:
Well, I'm not a beginner, and I at least read the manual. I just got confused on (1) sentance. To say you must be a beginner if you don't understand something is not at all accurate.
Understood and not a put down.
That's why so many take the effort to chime in and offer their support.
As usual the horse is so dead and beaten the corps is hard to identify...but then again as always the fun is in the mix of opinions as the solution unfolds...
Mar 27, 2017 19:03:42 #
catchlight.. wrote:
Understood and not a put down. br br That's why ... (show quote)
True. Sometimes the original post gets lost.
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