Been spending a lot of time on here!
- Nov 27, 2011
- Reaction score
- St. Louis
- Can others edit my Photos
- Photos OK to edit
just American English, not a problem for me. vinI know what ASA does for film. never knew what ISO did. now in the digital age, its point and shoot, dam the consequences.This is something I have been struggling with, and after reading this article, I'm still struggling. I "grew up" in film and I understand film ISO. I also understand the basics of electronic sensors. So I should see a digital ISO and know what it is telling me, right? Well, I really don't. I just use it like I was using a film camera as best as I can.
"You probably don't know what ISO means – and that's a problem" Published Aug 6, 2018 | Richard Butler
ASA? ....dam the consequences? WTF?!
I started in photography when ASA was the film sensitivity standard here in the US. I've followed along and kept up through the transition to digital and continue to enjoy taking photographs as I did 40 years ago.
Whatever it is that you're trying to say or comment on I suspect is predominantly your problem.
Once again, your obfuscating the issue.
ISO is one of three controls of exposure. The OP has been a film shooter for years and clearly understands how to use ISO with regard to film, but is hitting a stumbling block with digital, by reading overly complex, technical focused stuff. You did nothing to help him understand how to use ISO to make photos. It's clear that you are here to talk technology to the nth degree.
I use technology to make images.
I gave a simple straightforward answer that was not wrong, not in any way.
ISO provides the same function on a digital camera that it does with a film camera. I fully understand that it does not do it in the same way. They are completely different technologies, obviously. Knowing when/where/how the camera amplifies the signal
in no way helps you make better images.
I came back to this forum after a decade long hiatus and I see not much has changed. Maybe this will be short lived.
All I know is when I increase the ISO, the meter in the camera swings toward the “lighter” side and I can speed up the shutter and/or use a smaller aperture to center it. When I decrease the ISO, the opposite happens.
The essential elements of photography like exposure, have not changed in over 100 years. You can pick up a photography book from 70s, read up on shutter speed, aperture, and ISO, go pick up a digital camera, put it in manual, and start shooting successfully, employing that knowledge.
You can believe that by trying it out yourself.
It's not difficult to understand. First understand this: When the transition from film to digital began it was easiest to try and keep things feeling familiar. Lots of film photographers got their first digital cameras and rather than explain what was actually going on the simple answer was, "it's just like film." At the same time the industry was still figuring it out! I got my first digital camera in 2002. There was no ISO standard for digital cameras at that time. It didn't come along until 2006! (ISO 12232:2006). In the meantime a bazillion self-publishing experts got busy creating all those Youtube videos explaining it all.
If you want to actually read the ISO standard you have to pony up some serious $$$ as selling the details is how ISO pays the bills. In this case however there's a free way around it. In 2006 what ISO did was simply adopt the standard from CIPA (Camera & Imaging Products Association) of which all our camera manufacturers are members. CIPA - Camera & Imaging Products Association: CIPA Standards Specifically you're looking for this document: http://www.cipa.jp/std/documents/e/DC-004_EN.pdf
I've read it and if you want to avoid slogging through it you can trust me to tell you that the ISO "sensitivity" values that you find on your camera are arrived at by measuring the brightness produced in a sRGB JPEG generated by your camera's processing software when exposed to a standard target. Who cares right? Well Fujidave might care eventually since he's shooting a Fuji camera. Since ISO is not a measure of the light sensitivity of the camera sensor is it possible that's actually different and could that matter to the photos you take? The answer is yes and yes especially if you're shooting a Fuji camera -- I shoot a Fuji too.
Next: Changing ISO on your camera does not change the sensitivity of anything. ISO on your camera does two things: a) It puts a spin on the metering systems and the camera meter calculates a new exposure. As you raise the ISO value the camera calculates an exposure reduction and as you lower the ISO the camera calculates an exposure increase. Many people confuse this ancillary function and make the spurious jump to thinking ISO therefore determines exposure at least in part. It does not. b) ISO boosts, brightens, gains (description of this process is tricky because old words like amplify have connotations that aren't quite right and multiple technologies are employed) the analog data coming from the sensor prior to and/or during ADC (analog to digital conversion) to normalize brightness in the raw file from which the JPEG is then created.
The one thing I do know is, to take a photo you need Light. So for me I have to really learn the Exposure Triangle, if I am right that is Shutter speed, Aperture and ISO. That`s if I read it all right that is.