dosdan

I would not have used 1/1250s & ISO1600 for your last shot. I think 1/640s (at ISO800 in this shot) is fine for running, particularly with a bit of panning. 1/640s gets a bit slow in soccer. Since...

Easy to test: Set AE mode to M Set ISO to 100 Set aperture ring on lens to very small e.g. f/22 Press Green button to stop down & set metering. Did this in bright sunshine. Needed Evcomp -0.3 to...

Gordon, an interesting conjecture, but why only at ISO3200? ISO 6400 looks like it's normally spaced in the dark part of the Full SNR curve when you compare it to all the other curves, while the...

The rear element is the thoriated element, so that's the end that should be directly exposed to the sunlight.  Watch this short video measuring an old lens with a Geiger...

Well that complicates matters. Here's what I've done. 1. On the individual camera tabs: plotted against Ssat instead of Manufacturer's ISO. FWC ratio may have been better, but it would have been...

Yes, as mentioned in the first post in this thread, the simplified "sensor" read noise, includes the noise from the input side of the programmable gain amp, and hence is analogue gain-influenced,...

I used the Sensorgen data and then fiddled with my own Sensor RN & ADC noise values to get a decent curvefit. See the RN Contributions tab here (I've only do the extra work for the 4 cameras shown...

I think it's of interest: 1. At what ISO ADC-referenced sensor RN overtakes ADC RN as the predominant read noise source. 2. At what ISO the sensor RN becomes the overwhelming source of the total...

I'd be surprised if you couldn't duplicate this with a D800, as that sensor is well suited to ISOless operation. Going with 4 stop from too high a starting ISO won't do much at all because the...

No, it doesn't. Have a look at this composite image file and then I'll explain what I did. Using a camera with a low-noise ADC system: Pentax K-5. Set to raw. Set to M mode. Set AE to...

Yes, I'm going to reword that. The DR decreases because the sensor noise floor is being amplified as ISO is boosted, while the headroom remains similar. In ISOless & semi-ISOless mode, for the same...

To demonstrate that, for the same exposure, the clipping can be reduced/prevented because it is being caused here by running out of bits, rather than filling the sensel. Once you've confirmed that,...

I've run of of edits. I'll try again: Select a scene that has a bright source and darker stuff, say a shaded bedside lamp and stuff on a bedside table or wall. Use a tripod if you have one. Shoot...

Try this simple test. Select a scene that has a bright source and darker stuff, say a shaded bedside lamp and stuff on a bedside table or wall. Use a tripod if you have one. Shoot in M mode. Shoot...

Not a "floater" but a "bottom of the lake" story:

A Pentax Optio W90 P&S, lost under water & mud for 2 months – lake drained – metal detector finds it – battery half drained, but the camera still...

Not a "floater", but a "bottom of the lake" story:

A Pentax Optio W90 P&S, lost under water & mud for 2 months – lake drained – metal detector finds it – battery half drained, but the camera still...

A similar tale. Not a "floater", but a "bottom of the lake" story:

A Pentax Optio W90 P&S, lost under water & mud for 2 months – lake drained – metal detector finds it – battery half drained, but...

Interesting. DxOMark's comment on this: On the surface this is odd, but perfectly explainable: A manufacturer has two options for increasing ISO sensitivity; either to order the sensor to increase...

As I understand it, the noise floor in 14-bit DSLR systems is sufficient to correctly dither the ADC so that posterisation is not an issue with low-level signals. It may be a problem with 12-bit...

I was computing the 16x value (total read noise, input-referenced, at ISO100 vs ISO1600) incorrectly. It does not make a great difference to the results. I'll use the sensorgen total read noise...