D300S - why it is slower at low light?

Started Aug 9, 2014 | Questions thread
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Osvaldo Cristo
Osvaldo Cristo Veteran Member • Posts: 4,176
D300S - why it is slower at low light?

I noted in my birds shots sometimes the shot speed decreased something (using CH). I try to isolate the situation in order to simplify the analysis:

Setup: AF-C, all NR off, AUTO ISO off, M mode at 1/250 second, CH release, JPEG only.

Test1: camera lens towards a bright window and press release for a few seconds

Test2: lens cap on the lens and press release for some seconds

Results: Test1 shows notably higher speed than Test2

Could someone please explain why the shot frequency is lower at low light? Does anyone have an idea how to have the same speed either at any light conditions?

Edit to note: I forgot to mention if you make the same test with QUAL to raw 12-bit only the results are the same.

Thanks in advance for your help.

All the best,

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O.Cristo - An Amateur Photographer
Opinions of men are almost as various as their faces - so many men so many minds. B. Franklin

 Osvaldo Cristo's gear list:Osvaldo Cristo's gear list
Olympus Stylus 1030 SW Nikon D200 Nikon D300S Nikon D810 Nikon AF DX Fisheye-Nikkor 10.5mm f/2.8G ED +32 more
Nikon D300S
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