Discussion in 'General Equipment Chat & Advice' started by Stephen Rundle, May 30, 2020.
Is this iso REAL! or have things gone nutz
Actually my camera iso goes to 51200 and I have never gone above 3200.
Yes but that is 1 MILLION+
I remember when 800asa fim was fast and once I even pushed hp5 to 1000asa
Don't expect any kind of result at that extended ISO. It is good to 12,800 according to DP Review. https://www.dpreview.com/reviews/nikon-d500/7
A shot of the colour test chart at that speed, from the ephotozine expert review.
You do seem to lose a bit of detail...
If it let me get a picture I couldn't otherwise, I'd go for it. YMMV of course.
Simply multiply 6,400 by 2 eight times and you get 1,638,400 which rounds nicely to 1,640,000 or for convenience 14 stops faster than ISO 100.
It is a weakness of the ASA system, adopted by the International Standards Organisation, that each step was a doubling of the previous value. I dare say when ASA 25 was considered fast nobody saw any problem in that as they never expected that anything faster than ASA 800 was ever likely to be possible. In hindsight the DIN system would probably have served us better, progressing by one for each 1/3 stop increase in sensitivity thus ASA 100 was DIN 22 and ASA 200 DIN 25 etc.
I don't see that as a weakness. If you're used to them, logarithmic systems such as Decibels or DIN film speeds are fine but most people are more comfortable with arithmetic systems. My experience is that it's much easier for new photographers to grasp shutter speeds than f-stops, hence the ASA film speed system won because it worked better for the majority of users.
It is a weakness only in that the numbers very quickly become unmanageable, in therms of understanding the effect an arithmetic scale is indeed easier for the majority to understand and, as each stop represents a doubling/halving of the light reaching the sensor, is arguably more logical.
Does anyone have this camera, I'd love to see a 1.5m iso image...................... please
You would be very disappointed, unless doing a mono conversion of a random polka dot pattern. There are examples of IQ for different ISOs in the link in post #5
If Nikon made hi-fi amplifiers they would all have volume controls that 'go up to 11'.
Don't forget that the ASA (ISO) scale is linear, so the numbers grow big very quickly once the 'sensitivity' increases by 7 or 8 F stops.
The old European DIN scale was logarithmic (like the sound level decibel scale), and each doubling of 'sensitivity' only increased the DIN number by 3, which avoided big numbers that impress people who like big numbers.
So for ASA/ISO we have speeds of 100, 200, 400, 800, 1600, etc, but for DIN these would be 21, 24, 27, 30, 33, etc.
I would be interesting to find out if any Forum members use very high ISO settings on digital cameras. My record is 8,000 when using a ancient 80-400 lens at 400 mm lens hand held at 1/1250 and F11 (no modern stuff like image stabilisation): I was amazed how good the result was.
fairly regularly I use 25,000 and the monthly theme entry I posted today on the illumination at York Minster used (I think) 11,000. You are welcome to download and check
U use as high when shooting dawn and dusk for a sports magazine but to 1.5m
My first digital SLR was the Sony a100 .
It's ISO went up to 1600 .
That's right. 1600 , no noughts missing !
Unless you converted them to black and white , it was unusable . ISO 400 was it's highest useable speed .
I imagine 1,640,000 on the Nikon in 2020 is the same as the Sony was with 1600 in 2006 .
Sony make many of the Nikon senors - albeit on different production lines. Sony is the 800-pound gorilla in the world of imaging sensors these days, as an estimated half of all sensors (and 70% of all smartphone camera sensors) are made by the company. -Times change.
The Nikon D6 has a maximum ISO of 102,400
That can be expanded to 3,280,000
Exactly one stop faster than the D500
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