Can someone explain the logic why the Auto ISO function is not part of the standard ISO function? It could have easily been inserted as ...800, 1600, H-1, H-2, AUTO, 200... This would have automatically disabled the H-1 & 2 from use while in Auto mode.
Also, when I use Auto ISO, the D-100 always seems to use the ISO that was chosen. Am I missing something here?
#1. "RE: D-100 Auto ISO" | In response to Reply # 0Wed 14-Aug-02 06:08 PM
>Can someone explain the logic why the Auto ISO function is
>not part of the standard ISO function? It could have easily
>been inserted as ...800, 1600, H-1, H-2, AUTO, 200...
Because Auto ISO, as Nikon has defined it, is based on you first picking SOME value to work from. If Auto ISO were a selection from the ISO list, then you would have no defined starting point.
>Also, when I use Auto ISO, the D-100 always seems to use the
>ISO that was chosen. Am I missing something here?
In S,A, and P mode it will stick to the chosen ISO until it runs out of useable shutter speeds, aperture settings, or (in the case of P mode) both. At that time, if there is latitude remaining in the necessary direction, the camera will adjust the ISO to give you a correct exposure.
In M mode, I have noticed that you can set a shutter speed and aperture and the camera will vary the ISO over the range of 200-1600 to get a proper exposure. I call it "EV priority".
Does that help?
#2. "RE: D-100 Auto ISO" | In response to Reply # 1Thu 15-Aug-02 08:57 AM
Thanks Victor. It does help. But from what you state "as Nikon has defined it" Its not really AUTO, is it? AUTO means without user input. Its more of a Priority ISO with some built-in programming latitude. It will adjust the ISO (AUTO) in full MANUAL mode, but tend not to in Shutter, Aperture, or Program modes? Its more flexible in MANUAL than in PROGRAM? That makes no sense. It remains were you set it until it runs out of useable shutter speeds or aperture settings. Who defines useable? 1/4 sec isn't useable unless you are on a tripod and as far as I know, it doesn't detect its attached to a tripod.
Example: If the D100 is set to ISO 200, AUTO, P mode and I am trying to shoot fast moving objects and the light isn't so great, it may not give me a fast enough shutter speed. I would assume AUTO would bump it up to a faster ISO. But from what you said, it won't. It will just slow my shutter speed down. I know, I know. Its not a Point & Shoot. But even my N70 (no snide comments please) has a Speed Program for this.
Victor, my comments are not directed at you personally. Its just some fustration with the D100.
#3. "RE: D-100 Auto ISO" | In response to Reply # 2Thu 15-Aug-02 09:24 AM
Nothing personal at all, and I didn't take it that way even before I read the last line.
Everything you say is valid. The benefit of Auto ISO is marginal when it still lets the camera set a shutter speed unusably long before it takes effect. I guess it's more useful in S mode, where you are more likely to hit the low end of the f/stop scale (and still able to take a useable picture), at which point it ups the ISO for you. I guess in the mind of somebody (or more likely the agreement of some design board) at Nikon it makes sense the way they did it.
Personally, I havn't found much value in it. Maybe somebody can give some examples of where it's really useful.
#4. "RE: D-100 Auto ISO" | In response to Reply # 3Thu 15-Aug-02 11:48 AM
(Do we still use that word?) and expect it to be AUTO, not a flexible priority that MAY adjust if certain conditions are met. Do they name those conditions in the manual? I don't think so. If so, please tell me the page number. I think I will just turn off the AUTO ISO and keep my need to choose the ISO in the back of my mind prior to shooting (along with all the other options).
#5. "RE: D-100 Auto ISO" | In response to Reply # 0
Sorry for not quite understanding this thread. Are you saying that the D100 can't be set to a specific ISO and left there? Or is there a function called auto ISO that will automatically adjust the ISO for you if the shooting conditions change.
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#6. "RE: D-100 Auto ISO" | In response to Reply # 5Thu 15-Aug-02 10:50 PM
The D100 most definitely CAN be set to a specific ISO equivalent and left there.
The D100 does have, as you have surmised, a custom function, that, when enabled, lets the camera change the ISO equivalent to get a proper exposure IF there is no adjustment left in the shutter speed or aperture, depending on the exposure mode. In the manual mode, the shutter speed and aperture stay as set, and the ISO equivalent will be changed to keep proper exposure.
When the custom function is disabled, ISO is fixed at whatever the user set it at. Nothing unusual at all.
#7. "RE: D-100 Auto ISO" | In response to Reply # 6RickD Basic MemberFri 16-Aug-02 12:19 AM
Thanks for setting me straight Victor.
I haven't read anything about this function, and I was a little surprised to think you wouldn't be able to set the ISO to what ever you wanted. I'm happy to hear that this function can be turned on and off as needed.
My curiosity about this camera has won over my will not to buy one. Now I am playing the waiting game again. I should have mine by early next week. So get your keyboard warmed up, as I am sure I will have a few questions to ask.
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