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Old Nov 27, 2002, 8:07 PM   #1
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Default Can't set Shutter Priority on CP 950

I have a small problem with my 950.. I can change the exposure mode (Program, Aperature Priority, Shutter Priority) only when the camera is set to 80 ISO sensitivity.

If I move the sensitivity off 80 ( to 100, +1, or +2), I can no longer set the exposure mode to Shutter Priority.

Is this working as designed, or is there a problem with the camera? It has been like this since I bought it.

thanks...
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Old Nov 28, 2002, 12:44 AM   #2
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Pilaar39,
I have a CP 950, and I had never tried to do that...I leave the ISO on default (80). So...I gave it a try, and mine does the same thing! Cannot select Shutter Priority on higher ISO ratings. I wonder why they did that?
EDIT: I checked the manual, and it does not say anything about mode restrictions with high ISO values.
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Old Nov 28, 2002, 11:07 AM   #3
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Bert.. thanks for the reply.
Bummer.. I thought my camera was busted and was going to get it fixed.. but it seems this is 'normal'.. too bad!
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Old Nov 28, 2002, 12:18 PM   #4
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Pilaar,
I'm going to send a question to Nikon Tech Support and ask them.
If I find out anything, I'll let you know. It might take a few days to get a reply. I'll post anything I find here, or if you like, I could Email you.
Bert
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Old Nov 28, 2002, 1:27 PM   #5
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Thanks Bert.. I appreciate that!
You can leave me a message here in this forum/topic and/or leave me a private message thru this board.

thanks again!
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Old Nov 30, 2002, 1:00 PM   #6
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Pilaar,
I posted a question to Nikon Tech Support. They sent me an acknowledgement and said I would receive an answer within three days. Stay tuned...
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Old Dec 4, 2002, 12:25 PM   #7
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Paul,
I finally got an answer from Nikon on the shutter priority question.
I'll post their entire reply below, and then make some comments at the end.

Subj: Re: Nikon contact request
Date: 12/4/02 3:56:39 AM Pacific Standard Time
From: [email protected]
To: [email protected]
Sent from the Internet

Dear Mr Bigelow
thank you for your email concerning the Nikon Coolpix 950. If the ISO is
set higher than the default setting shutter priority mode cannot be
selected. This is not a fault with the camera. Here is details regarding
this on the Nikon-euro.com web site.

The Coolpix E-950 brings photographic creativity to compact digital
cameras by offering Aperture- or Shutter-priority exposure control.


For a given lighting condition, changing the shutter speed freezes or
blurs movement, and changing the aperture alters the range over which
the image is in focus. These two adjustments are fundemental to
creative photography, bringing a sense of motion to a still image and
highlighting a subject against an out-of-focus foreground and
background.


The setting of Aperture and Shutter Speed always work in combination:
increase the shutter speed and the aperture must be made larger to
compensate for the loss in light; decrease the shutter speed and the
aperture must be closed to avoid overexposure.


1/500 @ f2.8
1/250 @ f4
1/125 @ f5.6
1/60 @ f8
1/30 @f11
The table on the left shows an extract from an imaginary set of
Shutter/Aperture combinations for a given exposure. As the shutter
speed slows, the aperture must be made smaller to keep the total
amount of light entering the camera constant.

It is possible to change the shutter speed of a compact digital
camera over a wide range (for example 8 seconds to 1/500th in the
case of the Coolpix E-950). It is not, however possible to make a
compact camera lens with as wide a range of aperture stops as an
SLR-type camera: the dimensions of the lens simply don't allow for a
large range with many stops. The Coolpix E-950 has three aperture
stops - some other "professional" digital cameras have only two!

Therefore in order to allow a fine degree of control of the Shutter,
some other method has to be used to compensate and maintain the
correct exposure if aperture will not serve. In this case, the
camera takes control of the sensitivity, which is used in conjunction
with the aperture to increase the accuracy and provide the fine
degree of control that is necessary to create an ideal exposure under
Shutter priority.
.
1/500 @ f2.8
1/250 @ f2.8 + sensitivity adjustment
1/125 @ f5.6
1/60 @ f5.6 +sensitivity adjustment
1/30 @ f11
..
The table on the left shows an imaginary set of
Shutter/Aperture combinations with sensitivity control used to
provide compensation at intermediate shutter settings where
there is no precise aperture value available.

If you have any further queries you can also contact our help-line on 020
8481 6875

Please make sure to include all previous email correspondence when
responding to an email so that we have a full and complete
history to assist you better in a resolution.

Regards

mike
Nikon UK Customer Support


The way I read it, they use the ISO setting to do the equivalent of intermediate aperture settings, and their algorithm is based on the default ISO value (80). It seems like it should be possible to make the same adjustments for other ISO settings, but it depends on how they have implemented the sensitivity. IF it's done in hardware (e.g., switching scaling resistors) they may not have enough flexibility. If it's done in software, it should be possible, but maybe there are other limitations (program memory size, execution time, etc.) Regardless, we now understand that it's a deliberate limitation, and one we're going to have to live with.
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Old Dec 5, 2002, 3:36 PM   #8
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BUMP. Just want to raise this on the list
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Old Dec 9, 2002, 2:06 AM   #9
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I'll bump it once more in case Paul comes back. I'll be out of town for the next two weeks, Paul. I'll check this when I get back to see if you have any more questions or comments. Have a nice holiday!
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Old Dec 9, 2002, 9:09 PM   #10
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Bert, many thanks for following up on this and posting the reply here! yes, I understand the "solution" Nikon implemented and the effect on aperature priority.

Am I happy with it? No. Will I live with it like you suggest? Only for a few more months until I upgrade to a D100.

I have had the 950 now for several years, and had fun with it, and lived with this shortcoming. It took great pictures but now it is time to move on.

Again, thanks for finding the reason for me, and any others that noticed this problem!

Happy Holidays!!
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