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03/01/2003 07:48:42 PM · #1 |
This may seem quite elementary to most of you, but could someone please explain SLR to me. I know what it stands for, but what exactly does it mean?
Just trying to learn as much as I can.
Thanks! |
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03/01/2003 07:55:49 PM · #2 |
The term single-lens reflex came about to distinguish from a twin-lens reflex where there were two lenses, one used to view the scene and one with a shutter behind it to take the picture. The twin-lens reflex camera suffered from a problem called "parallax" because, in a close-up situation, what you saw was NOT what your picture taking lens saw. Then, the single-lens reflex came about so that what you saw was EXACTLY what your camera took because you were using the same lens for viewing the scene and for taking the picture.
Hope this helps.
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03/01/2003 09:26:39 PM · #3 |
And it is usually (but not necessary) a body + lenses you can interchange. There is a canon mount for canon bodies, a nikon mount, a minolta mount and for hitorical reasons diferent mount per brand.
So usually with a SLR (we call them Reflex in france) you are not limited to the lens provided to you like on regular copact camera or digital camera.
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03/01/2003 09:52:02 PM · #4 |
SLR - single lens reflex 0 means that there is a mirror between the lens of the camera and the film that intercepts light and sends it through the viewfinder so that you can see what the image will look like when you take the picture.
When you press the shutter the image in the viewfinder disappears for a moment. This happens because the lens is pulled up briefly (That is the reflex part of SLR) to get out of the way so the image can be recorded.
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03/01/2003 09:58:35 PM · #5 |
You mean the mirror is pulled up briefly so that the light can pass by where it was and hit the film. (That's one reason they are traditionally so noisy.)
The "reflex" is from reflection; the fact it uses a mirror. |
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03/02/2003 11:38:28 AM · #6 |
GeneralE, thanks for clearing that up. I must learn never to quickly answer questions while drinking wine! It never works.
:)
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03/02/2003 12:56:27 PM · #7 |
Hummm....I wonder if the better lesson might be to never drink wine.
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03/02/2003 01:13:20 PM · #8 |
Current evidence is that moderate consumption of alcoholic beverages (about 0.6 oz/18 ml absolute ethanol per day) is somewhat healthier than tee-totaling. This is the amount in about 1 12-oz beer, 1 5-oz glass of table wine, or 1-1/2 oz (1 jigger) of distilled spirits.
However, the difference is small enough that there is no reason to start consuming alcohol if one currently abstains for religious, political, health, or personal reasons.
And mixing it inappropriately with other substances or activities (such as driving or scientific exposition) can definitely be hazardous. |
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