Recent content by st599

Amplifiers can't have a negative noise figure. They always add noise, they may reduce the signal to a point where it's below the visibility threshold but it's still there.

Personally, to record memories, to share what I like with friends who can't be present. Professionally, at the moment it's investigating how digital imaging systems handle scenes beyond their abilities - so lots of out of gamut, speculate and extreme contrast.

As ISO in the digital domain is actually the photosite or channel amplifier gain, increased ISO can increase the noise as the amplifier noise figure is usually gain dependant.

https://www.w3.org/Graphics/Color/sRGB If you're calibrating to sRGB, then it has an ambient viewing condition specified - see table 1. The calibration is only correct at that viewing condiition. Unlike the newer specs, I've never seen a table of what changes are needed for different...

You're a factor of 8 out. It's around 5 GB. But even that is heavily compressed, you can't do many reencodes before it's degraded. If you're recording 10 bit 2160p50, uncompressed it's approx. 12Gbps, so 1 min is: 12 * 60 / 8 = 90 GB

If you take 100 Mb/s as an example: 100/8 = 12.5 MB/s 12.5 x 60 x 60 = 45000 MB/hour = 45 GB/hour There's a slight difficulty in that flash memory quite often uses a factor of 1024 instead of 1000 to calculate size, but this will give you a decent ball park figure.

I prefer Photokina as most of the new kit is actually on the stands, but it's very taxing as my technical German isn't good enough for some of the conferences and seminars so I have to really concentrate. The NEC Show is OK, but the best stuff is off stand, but at least it's free.

Cinematographers say that a pan at 24fps is acceptable if an object takes 7 seconds to cross the entire frame.

Depends where in the world you are. D65 is a Northern/Western Europe Daylight and Clear Sky simulation.

The colour temperature of the ambient light significantly affects the perceived white point of the monitor. The sRGB spec gives a reference monitor and environment - the further from this, the harder calibration. If calibrated for a specific environment, the monitor should be operated in that...

Looks like a 2160p119.88 recorded as two streams, odd frames in on, even in another.

If you don't mind a little typing: https://www.ffmpeg.org/ First open a command window in the folder of image files: https://helpdeskgeek.com/how-to/open-command-prompt-folder-windows-explorer/ Then type ffmpeg -pattern_type glob -f image2 -r 25 -i "*.jpg" -r 25 -c:v libx264 video.mov (That...

Download the DB app and use the hire bikes - easiest way to get around. Lazy ride through Tierpark and eat at: https://www.capt-schillow.de/ Sundays, ride out to Mauerpark or go for a stroll on Unter den Linden Museuminsel is worth a look, as is the Reichstag and surrounding area. Around...

.mp4 and .mov are both implementations of the same wrapper format. YouTube is wrapper format agnostic - you can use MP4, MOV, AVI, MKV, MXF... Video quality is more dependant on the video and audio codecs that you use within the wrapper. Whatever you upload, YouTube seems to re-encode, which...

An ARRI superclamp has a safe working load of 15kg. The Superclamp has a range of fittings, one of which is a "camera stud" which has 1/4" and 3/8" threads, so you can attach a tripod head or similar to the clamp.