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04/20/2009 05:02:53 PM · #1 |
When looking through the viewfinder of my D300 or my roomie's D90 with the battery removed, the viewfinder goes darker, and will not manual focus at long distances. If you look through the viewfinder while slipping the battery in, you can watch the image kind of pop to life. What mechanism is going on with the focusing screen/other parts to make this happen? Obviously I'm not looking for a solution, just an explanation here. Any of you tech-heads can explain?
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04/20/2009 05:07:03 PM · #2 |
| Perhaps it has something to do with the fact that your camera works with battery power?? |
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04/20/2009 05:07:54 PM · #3 |
my guess it relaxes the aperture control / so it closes down a bit ..
though be careful playing ..
some of these circuits depend on coming up in the correct order & don't like being powered on/off suddenly (removing/putting in the battery suddenly)
sudden surges are not nice to electronics |
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04/20/2009 05:23:58 PM · #4 |
@SteveJ very snarky, but the point is, a focusing screen is usually an analog piece of hardware--most cameras can utilize one without any power whatsoever, like my old film Minolta SLR. And if this is a fundamentally different focusing screen, my question was more aimed at what makes it different? What features need the battery in to run? And what features are these that require so little power that they can run at all times, even when the camera is off
@ralph when the lens is off, i.e. aperture control is nil, my lens is wide open, so that wouldn't quite make sense. And i wouldn't worry too much about my camera--i've noticed this phenomenon when the camera was off--the battery seems to be powering something in the screen even when the power is set to 'off.' So I'm only slipping in the battery with power off--you know, the maker-approved time.
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