Aperture Priority do I have a Problem


Art2105 12 26 United Kingdom
22 Jul 2008 7:22PM
Hi all, hope someone can advise me.
My camera is the Samsung GX10 and I am unsure if I have a problem. I have been using the Aperature Priority mode but without any success.
The problem is that the smaller the aperture is set to increase dof the greater the overexposure is.
To get some figures I have just taken a number of shots, Sky overcast 7.00pm. First shot on manual mode. A good picture at f5.6...1/60 sec then onto AV mode


Pic 1 AV f5.6 1/60 Good colour & Contrast
pic 2 f11 1/30 Over exposed
pic 3 f16 1/15 Greatly overexposed
pic4 f22 1/8 sec "
pic5 f32 1/4 "
pic6 f38 0.3 sec Complete Whiteout.

Is it me or is there a fault with the camera software. I would greatly appreciate any advise Thank you.

Arthur (Art2105)

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justin c 16 5.1k 36 England
22 Jul 2008 7:30PM
You're camera is fine. If you adjust the aperture you have to adjust the shutter speed accordingly.
rowarrior 12 4.4k 9 Scotland
22 Jul 2008 7:39PM

Quote:You're camera is fine. If you adjust the aperture you have to adjust the shutter speed accordingly.


Surely if he's in Aperture Priority mode the camera should be choosing the appropriate shutter speed, that's the point of that mode isn't it?
User_Removed 16 17.9k 8 Norway
22 Jul 2008 7:41PM
Correct.
justin c 16 5.1k 36 England
22 Jul 2008 7:41PM
I misread and thought Manual mode was being used.
User_Removed 16 17.9k 8 Norway
22 Jul 2008 7:44PM
I do it all the time Justin. Grin
yak_farmer 15 69 England
22 Jul 2008 8:08PM
Do you have exposure compensation set to +1ev?
If you're in manual mode it won't effect your exposure but as soon as you resort to aperture priority it'll kick in. Going by your initial manual exposure being correct, all your further exposure are over-exposing by a 1 stop.
User_Removed 16 17.9k 8 Norway
22 Jul 2008 8:09PM
Assuming that -

a) You are in AV (Aperture Priority Mode)
b) Shooting the same subject under the same lighting conditions
c) taking your first EV and results at face value
d) Constant ISO setting
e) No form of 'Auto' ISO' setting switched on
d) No form of Auto compensation or bracketing selected

- then I would expect the following results -
Pic 1 AV f5.6 1/60 Good colour & Contrast
pic 2 f8 1/30 Good colour & Contrast
pic 3 f11 1/15 Good colour & Contrast
pic4 f16 1/8 sec Good colour & Contrast
pic5 f22 1/4 Good colour & Contrast
pic6 f32 1/2 Good colour & Contrast

- or something very similar (the DoF will have varied with each change of aperture setting)
Krakman 13 3.6k Scotland
22 Jul 2008 8:13PM
One possibility is that the aperture mechanism is failing to close down as it should due to mechanically failure, so the camera is actually taking all the pics at maximum aperture where it thinks it's stopping down.
yak_farmer 15 69 England
22 Jul 2008 8:13PM
Ignore everything I've just said, my brain isn't quite up to speed tonight!!
yak_farmer 15 69 England
22 Jul 2008 8:16PM
Does your camera have a depth of field preview function? If so you'll be able to see if your camera is able to stop down the aperture to it's required setting or if it's getting stuck.
User_Removed 16 17.9k 8 Norway
22 Jul 2008 8:17PM
( Welcome to the club Andy! Wink )

'Crofty' has a point... (Krakman)
yak_farmer 15 69 England
22 Jul 2008 8:18PM
Yeah, thanks Mike. Happens to the best of us huh!!!
Art2105 12 26 United Kingdom
22 Jul 2008 8:19PM
Thanks Ok Justin, thanks for the response all the same. Yes the camera is in Apereture priority Mode and seems to be selecting the wrong shutter speed for the correct reciprocity. I have tried differrent setting in the menu options but without success.

Art
conrad 15 10.9k 116
22 Jul 2008 8:22PM
That's exactly what my 20D does. Never been able to figure it out.

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