Strange ISO

Tomwlkr · Sep 12, 2024

While playing around in my bedroom with my D7100 and 50mm 1.4, ISO 800, aperture set at f2.0, camera selected shutter 320, viewfinder showed ISO 800 but as I pressed shutter release it changed to R05, pic comes out fine but why the ISO readout change?

reddesert · Sep 13, 2024

It's not the ISO. Nearly all Nikon DSLRs that I know of will show this while the shutter button is pressed. It's displaying the number of images that the onboard memory has space for, before it has to write out to the flash card. If you change the image format settings (like JPEG+Raw vs JPEG Fine vs JPEG Basic) the rNN number will change.

The camera comes with a book, which is a novel about a photographer named Manuel. This feature is covered on the page where he encounters the Memory Buffer.

Tomwlkr · Sep 17, 2024

reddesert said:
It's not the ISO. Nearly all Nikon DSLRs that I know of will show this while the shutter button is pressed. It's displaying the number of images that the onboard memory has space for, before it has to write out to the flash card. If you change the image format settings (like JPEG+Raw vs JPEG Fine vs JPEG Basic) the rNN number will change.

The camera comes with a book, which is a novel about a photographer named Manuel. This feature is covered on the page where he encounters the Memory Buffer.

Memory buffer according to the manual says 100 shots not 5

Tomwlkr · Sep 17, 2024

reddesert said:
It's not the ISO. Nearly all Nikon DSLRs that I know of will show this while the shutter button is pressed. It's displaying the number of images that the onboard memory has space for, before it has to write out to the flash card. If you change the image format settings (like JPEG+Raw vs JPEG Fine vs JPEG Basic) the rNN number will change.

The camera comes with a book, which is a novel about a photographer named Manuel. This feature is covered on the page where he encounters the Memory Buffer.

And my D200, D300s D7000, and D600 don't do it and the D7100 didn't do it rtill recently. ******
{Moderator's note - rude and argumentative phrase deleted}

Chan Tran · Sep 17, 2024

If the camera is set in DX mode and 14 bit uncompressed raw then the buffer is only 6 shots. If you take a shot the buffer would show 5 remaining.

Chan Tran · Sep 18, 2024

I found my Nikon Df does that when I have Auto ISO enable. It would display the ISO then switches to remaining buffer when I press the shutter release button. Regardless as to why the r05 refers to the buffer not ISO and that is for certain.

Tomwlkr · Sep 19, 2024

Tomwlkr said:
OK, finally an answer that's not stupid, I recently switched my ISO to auto so maybe that"s the problem, I'll check it out

Nope set auto to off ISO 640, still shows R05,,, dropping post, I shoot jpeg single shots doesn't affect my shots so I'll livbe with it, just wondered why and evidently no one on 3 forums knows

reddesert · Sep 19, 2024

My remark above about "Manuel" was unnecessarily snarky. However, the explanation that I and others offered about rNN displaying the number of shots that can be written to the memory buffer is correct. I'm holding a D200 which has Image Quality set to "JPEG Normal." When I half-press the shutter button, the exposure counter display (next to the ISO in the viewfinder) switches to "r25". If I change the Image Quality to Raw+JPEG Normal, a half-press of the shutter shows "r19". If one changes the other image saving settings, the number may change, and of course it also depends on the camera model.

abruzzi · Sep 19, 2024

Strange ISO

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