How do I fix my Sony A7R4 camera's settings to get a perfect exposure of a black cat in a coal bin under low light?
May 24, 2023 12:20:58 #
TheShoe
Loc: Lacey, WA
jcboy3 wrote:
The way to get separation of a black cat from a coal bin is to use a squirt gun.
That will work every time.
May 24, 2023 12:47:36 #
Ysarex wrote:
Sensor DR and noise are two sides of the same coin. Noise limits DR -- we measure DR from the sensor's saturation threshold down to the noise floor. Lower the noise floor and you expand DR. The tech end keeps improving -- albeit more slowly these days. Cameras capable of + 12 stops of DR are increasingly common.
A black cat in a coal bin would require the amount of DR separation seen in my photo.
May 24, 2023 12:52:57 #
Ysarex
Loc: St. Louis
rehess wrote:
A black cat in a coal bin would require the amount of DR separation seen in my photo.
Your photo has a cat with white fur and a cat with black fur -- that's more DR than just a black cat.
May 24, 2023 13:29:16 #
Shooter41
Loc: Wichita, KS
Ysarex wrote:
Sensor DR and noise are two sides of the same coin. Noise limits DR -- we measure DR from the sensor's saturation threshold down to the noise floor. Lower the noise floor and you expand DR. The tech end keeps improving -- albeit more slowly these days. Cameras capable of + 12 stops of DR are increasingly common.
Dear Ysarex...In your picrture of the black cat on your grey jacket, the left side of the cat shows no detail of the fur, while the right side of the cat is well lit and shows ever hair. My goal is to have the entire cat exposed correctly so that the details are clear on the entire cat. Was you picture taken with a flash on the right side of the cat or no flash at all? I like your photo, but am looking for answers to how to have the entire cat exposed correctly to show all of the detail of the fur. Thanks for your contribution.I look forward to your information. Shooter41
May 24, 2023 13:38:31 #
Ysarex
Loc: St. Louis
Shooter41 wrote:
Dear Ysarex...In your picrture of the black cat on... (show quote)
That's not my cat photo and not my post.
May 24, 2023 13:51:34 #
spaceytracey
Loc: East Glacier Park, MT
TheOriginalHammer wrote:
Ignorant of Green Zone - Please describe how to use
Likewise. I w/Google it.
May 24, 2023 13:53:43 #
Ysarex wrote:
Your photo has a cat with white fur and a cat with black fur -- that's more DR than just a black cat.
You are seeing "Velcro" on the left side of the photo.
"Leila" is napping on the right side of the photo.
Here is a slightly over-exposed version.
From the camera I couldn't tell which version was better,
but once I looked on the computer, I could tell that the DR was inadequate to cover "Velcro".
I suppose the OP could under-expose his shot a bunch, since even this photo doesn’t give a clear view of “Leila”.
May 24, 2023 13:59:04 #
spaceytracey
Loc: East Glacier Park, MT
spaceytracey wrote:
Likewise. I w/Google it.
Well, nothing helpful after Googling Green Zone. A movie, a section of Baghdad, and a Stock agency. References to The Zone system offer nothing I don't already know. So, if someone would like to educate me/us, please feel free to do so.
May 24, 2023 14:03:06 #
Ysarex
Loc: St. Louis
rehess wrote:
You are seeing "Velcro" on the left side of the photo.
No, I am seeing two cats -- one with white fur and another with black fur. White and black is more DR than black and black.
May 24, 2023 14:04:59 #
Ysarex wrote:
No, I am seeing two cats -- one with white fur and another with black fur. White and black is more DR than black and black.
and the DR of this shot was inadequate for the black cat; putting light on the subject would have helped. Even this second shot gives a poor view of part of the black cat.
May 24, 2023 14:14:42 #
Ysarex
Loc: St. Louis
rehess wrote:
and the DR of this shot was inadequate for the black cat; putting light on the subject would have helped. Even this second shot gives a poor view of part of the black cat.
It's inadequate for the white cat -- the highlights in the white fur are clipped. If it was only a black cat you could have altered the exposure and less DR would have sufficed.
May 24, 2023 14:32:22 #
Ysarex wrote:
It's inadequate for the white cat -- the highlights in the white fur are clipped. If it was only a black cat you could have altered the exposure and less DR would have sufficed.
This was a ‘natural light’ photo. I’m not sure if altering exposure would have left the view of the side of the black cat OK. In any case, more light would fix the situation.
May 24, 2023 15:35:33 #
TheOriginalHammer wrote:
Ignorant of Green Zone - Please describe how to use
May 24, 2023 20:26:17 #
May 24, 2023 22:36:21 #
wrangler5
Loc: Missouri
Shooter41 wrote:
Dear dpullum... For those who live in older homes built during or before the 1940's in colder climates, sometimes still have the coal bins in the basement even though they have not received a coal delivery in many decades. < snip >
My parents bought their first house in 1949. It was built in the '20s and originally had a coal furnace and coal bin in the basement. But by the time we moved in the furnace had been converted to oil, with the oil tank taking up just a part of the old coal bin. My father used the rest of the space to build a darkroom, where I got to "help" beginning in the early '50s. (While he was a traveling auditor in the '30s he had a steamer trunk for his clothes and a smaller suitcase that held all the equipment needed to develop and print B&W film, including an enlarger. I took the darkroom suitcase with me when I went on active duty in 1968. I think darkroom work is in our DNA.)
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