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08-12-2018, 12:59 PM #11
Re: "Automagic" ISO setting on a DSLR
I always think of (electronic) noise in a DSLR as the equivalent of fog in a film emulsion's "base+fog" dynamic.
The more we push-processed, or the longer we stored a specific brick of still film, the higher the base+fog we observed.
Really noise is a good indicator of Image Quality because it is a resultant of the internal circuitry attached to a sensor chip.
As the cameras matured the noise decreased due to better manufacturing and better design choices by Nikon/Canon/Sony/Fuji, etc. However those decisions cost $ that some manufacturers choose to forgo.
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- 08-12-2018, 12:59 PM
08-12-2018, 02:38 PM #12Senior MemberRe: "Automagic" ISO setting on a DSLR
ThanksChucktin,
I recall some folk saying in the old days that you had to store color film for a certain number of months before it was at its best.
Speaking of fog... there is the classic case of Kodak's fogged sheet film back in the late '50s or early '60s. The Kepner-Tregoe problem solving methodology used that as one of their case studies. I recall taking a K-T course MANY years ago. The instructor described the symptoms - Kodak was receiving complaints about high end sheet film being fogged right out of the package. We the students were supposed to apply the K-T process to solve the problem.
As it turns out there was a chemist and rather remarkable character in the class. He said before we even started "I bet it's the separator paper between the sheets." This of course WAS the cause - residue from some chemical used in bleaching the paper interacted with the film. Blew that example/exercise out of the water. Turns out the chemist was an avid photographer and had been involved in investigating the Kodak paper fiasco.
Ken
08-12-2018, 06:55 PM #13Re: "Automagic" ISO setting on a DSLR
Yes, I have heard both stories. But by that time we were 80/90 percent roll film. The biggest row was the 35mm fans vs the 120 fans with the sheet filmers making up the rest.
Auto ISO is a useful adjunct but I keep mine manually set as low as I can to maximize image quality.singlerosa Thanks/liked this post
08-12-2018, 08:09 PM #14Re: "Automagic" ISO setting on a DSLR
I remember when the open air nuke testing in Nevada caused some serious fog problems at the Kodak film factory in NY state.
D750, D90, D100, Nikon 1 J5
(Once owned: EL, F2AS, D50, D200, D300s, and D7100)
01-24-2019, 08:17 PM #15Re: "Automagic" ISO setting on a DSLR
I realize this is a somewhat old post but have reached the point where I need to use Auto ISO. I just don't understand Jake's comment about using Auto ISO while in Aperture Priority mode. I know how to set it in Manual Mode. How does the shutter get controlled if the camera is using Auto ISO in Aperture Priority?
I keep U1 programmed for BBF in Aperture Priority with a set value for my aperture and my ISO (wasn't using Auto ISO). When I needed it yesterday, I missed the shot since my shutter was too slow (around 1/400" for BIF). U2 is programmed for BBF in Manual Mode. I want to set up both of these to incorporate Auto ISO. I can do the Manual Mode one. But how to I determine my shutter speed while in Aperture Priority?Does anyone know?
Cindy
Flickr and My 2019 Thread
Where the Spirit does not work with the hand, there is no art -- Leonardo da Vinci
01-24-2019, 09:24 PM #16Re: "Automagic" ISO setting on a DSLR
I did some digging and figured out the settings for Auto ISO in Aperture Priority while setting a minimum shutter speed value. Those settings are saved as U1 and U2. What I don't understand now is why I cannot set Aperture Priority for Auto ISO while Manual Mode is a straight ISO value. If it's set as Auto ISO while in Aperture Priority, it stays in Auto ISO for Manual Mode. Oh well. I turned Auto ISO off for those and only have it set for U1 and U2. That will be fast to change the settings.
Cindy
Flickr and My 2019 Thread
Where the Spirit does not work with the hand, there is no art -- Leonardo da Vinci
01-24-2019, 09:41 PM #17Re: "Automagic" ISO setting on a DSLR
It gets complicated. You might find this article helpful... Skip down to section 5.1) Aperture Priority with Auto ISO :: What is Auto-ISO
Last edited by Horoscope Fish; 01-24-2019 at 09:47 PM.
hark Thanks/liked this post
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01-25-2019, 12:18 AM #18Re: "Automagic" ISO setting on a DSLR
Thanks for this info, Paul. It's interesting as well as informative. I forget about that web site--he supplies excellent information.
I have U1 set for Aperture Priority with Auto ISO and U2 for Manual Mode with Auto ISO. Most likely the latter is the one I will now use. I'm accustomed to working in Manual Mode although not with Auto ISO. It should work well for my shooting style since it's SUPER easy to change aperture AND shutter speed on the fly.
The thing that annoys me is how the Nikon DSLR bodies are set up for changing the ISO. There is a button on the rear that gets pushed along with scrolling the rear wheel. BUT if the image display has not yet turned off, you cannot change the ISO. The rear display simply changes from showing 1 image to showing multiple images. And that's exactly what happened yesterday.As soon as I went to change the ISO, the image display split the screen into multiple images. And I knew I lost my chance at getting a decent shot with better settings.
Cindy
Flickr and My 2019 Thread
Where the Spirit does not work with the hand, there is no art -- Leonardo da Vinci
01-25-2019, 12:25 AM #19Re: "Automagic" ISO setting on a DSLR
hark Thanks/liked this post
Camera: Nikon D7200
Lenses: Tamron 70-300mm F4-5.6 Di VC USD A030, SIGMA 17-50 mm. f 2.8
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01-25-2019, 12:54 AM #20Re: "Automagic" ISO setting on a DSLR
Thanks for this, M.J.! That had 2 things in it I hadn't known. @Horoscope Fish - did you know about either of these?
1. With some bodies, there is/was a glitch when setting Auto ISO. Near the end of the video, he went in and turned off Auto ISO, lowered his ISO to 100, then went back in and set Auto ISO. Coincidentally mine was set for ISO 1600 like his, and when I went into the rear screen, it displayed as ISO 1600 even though it should have gone lower.
2. While in Aperture Priority with Auto ISO, he shows an alternative to using the +/- button for exposure compensation. That can be changed to raise/lower with the rear wheel instead of the 2-handed method.
Thanks again, Michael. Good to know this.Michael J. Thanks/liked this post
Flickr and My 2019 Thread
Where the Spirit does not work with the hand, there is no art -- Leonardo da Vinci
01-25-2019, 12:54 AM
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