lightspeed
member
Reged: 17/09/2006
Posts: 108
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I have a strange "problem" with my D300
In aperture priority mode, when the shutter speed falls below about 1 second, the word "Lo" appears in the viewfinder, and on the top LCD screen, and the exposure meter display flashes. However, if a picture is taken, the shutter speed is correct, i.e can go up to several seconds.
Why is the camera displaying "Lo"? I thought this meant that the exposure was out of the camera;s capability, but this is clearly not the case.
Does anyone else find this, or have I enabled some obscure setting somewhere? it's quite annoying as for long exposures, you have no idea how long the shutter speed is going to be!
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sillyconguru
enthusiast
Reged: 05/11/2005
Posts: 344
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Quote:
Why is the camera displaying "Lo"? I thought this meant that the exposure was out of the camera;s capability, but this is clearly not the case.
The light level is outside the light meter's EV range (which is 0-20 EV for 100 ISO, see page 408 of the user manual), the camera will still be able to expose reasonably but accuracy isn't guaranteed.
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lightspeed
member
Reged: 17/09/2006
Posts: 108
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Thanks.
Yes, that must be it, but it is strange that none of my other DSLRs have done this, and my F80 film camera just keeps on increasing the shutter speed displayed as the light reduces (e.g. by successively reducing the aperture)
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sillyconguru
enthusiast
Reged: 05/11/2005
Posts: 344
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Quote:
it is strange that none of my other DSLRs have done this
Are they Nikons? I just tested a D40 and it does the same as your D300, and IIRC the D70 & D200 also do the same.
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lightspeed
member
Reged: 17/09/2006
Posts: 108
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Quote:
Quote:
it is strange that none of my other DSLRs have done this
Are they Nikons? I just tested a D40 and it does the same as your D300, and IIRC the D70 & D200 also do the same.
I don't remember my D80 and D70 doing this, but I could be mistaken.... I know My F80 doesn't do this.
It just seems a little strange - if the metering works well enough to set a speed of several seconds, why not display it? (maybe in a flashing mode or similar to warn of reduced exposure accuracy)
Thanks for checking your D40
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Towershot
old hand
Reged: 19/03/2007
Posts: 766
Loc: Lancashire, U,K.
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My D80 did it, go on RTFM, you know it makes sense. 
--------------------
Got a good camera, now to get a good photographer.:~<
Rick
My Flickr
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RichardReeves
journeyman
Reged: 28/07/2006
Posts: 54
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my D300 doesn't do what you describe. I've just tested it on ISO L 1.0, aperture priority and matrix metering. As I wind the shutter up, the metering hits 'Lo' only after the shutter speed has passed 30s.
I don't think either my D70s or F80 do that either <tests D70s and F80>. Nope.
Richard
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sillyconguru
enthusiast
Reged: 05/11/2005
Posts: 344
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Quote:
my D300 doesn't do what you describe. I've just tested it on ISO L 1.0, aperture priority and matrix metering. As I wind the shutter up, the metering hits 'Lo' only after the shutter speed has passed 30s.
I don't think either my D70s or F80 do that either
Test in very subdued light (or partially cover the front of the lens), the EV level needs to be below 0 (for ISO 100).
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lightspeed
member
Reged: 17/09/2006
Posts: 108
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Thanks Richard
Your post has prompted me to find the cause of the "problem"
<turns red with embarrassment>
My camera was in spot metering mode (I had inadvertently left it there since last time I used it)
What a pillock! (easily done, I suppose....)
Thanks to everyone who posted!
I'm off to check the other settings, now!
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sillyconguru
enthusiast
Reged: 05/11/2005
Posts: 344
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Quote:
My camera was in spot metering mode (I had inadvertently left it there since last time I used it)
Spot metering mode changes the light meter's sensitivity range to EV 2-20 (for ISO 100). "LO" can still appear in any metering mode, it'll just appear in slightly brighter light when spot metering is used.
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