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03-26-2008, 03:44 AM   #1
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Film newbie question...

Don't laugh guys....but here it is:
Can I change the lens if the film is in the camera? Does the mirror hold all the light away from film?

Wow, this is really a rookie question, but I'm still concerned....

Thanks!

03-26-2008, 05:05 AM   #2
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ok at least I now know that i am not the only complete newbie film owner here. waiting for mine to come and was thinking the same thing. has alot to learn about film my big thought was the iso setting can it be changed when film is loaded or does it have to stay at the iso of the film till the roll is done? I can see why digital is soo easy
03-26-2008, 05:14 AM   #3
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I can help you with that.... (WOW). You can change ISO setting, but you'll fool the camera then. Usually the camera gets the ISO automatically from the film roll. If you change it, the exposure will not be correct. Unless you want the exposure to be different, but you can do it with exposure compensation.
03-26-2008, 05:27 AM   #4
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Nope. Rest easy. Changing the lens will not expose your film. The mirror doesn't 'hold back' the light. The shutter does -- which is behind the mirror.

DSLRs don't have a shutter.

But what a shutter used to do was control 'exposure' of the film. . .which is measured in 1/250th of second or 1/50th of second. . .or whatever range is available on your camera. It's called the 'shutter speed'. Not the 'mirror moving out of the way speed' -- although that is clearly necessary for everything to work correctly.

When you don't have any film in the camera, operate the camera with the back open. . change the shutter speed a few times and press the shutter release. . you'll be able to see the shutter open and close at the speeds you've selected. 1/1000th of a second will be very quick indeed. 1/10th will seem very slow in comparison.

I'm not sure what kind of camera you have, but really old SLRs like my Yashica, had a silk shutter -- literally two black silk curtains that snapped from right to left. Newer cameras used different shutter mechanisms.

03-26-2008, 05:28 AM   #5
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thanks thats what i figured but figured better be safe and ask then experiment and find out that way. Hopes my PZ-1p comes today
03-26-2008, 05:34 AM   #6
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The shutter on an SLR is closed between shots - this keeps the light off the film, the same as it keeps the light off the sensor in a digicam. Thus, you can change lenses.

RE:ISO setting, the camera MAY pick up the ISO from the film canister if it is so equipped. Older cameras (like my Pentax MX) and more specialist cameras (like my rangefinders, and roll film cameras) have to be set manually.

I strongly suggest you have a look at a basic (pre-digital!) photography manual.
03-26-2008, 05:39 AM   #7
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QuoteOriginally posted by Talisker Quote
The shutter on an SLR is closed between shots - this keeps the light off the film, the same as it keeps the light off the sensor in a digicam. Thus, you can change lenses.

RE:ISO setting, the camera MAY pick up the ISO from the film canister if it is so equipped. Older cameras (like my Pentax MX) and more specialist cameras (like my rangefinders, and roll film cameras) have to be set manually.

I strongly suggest you have a look at a basic (pre-digital!) photography manual.
There is no shutter on a digital. The mirror is not the shutter

Exposure on a digital is just how long the sensor is 'on' and recording the light that strikes it. A digital sensor doesn't require a shutter to stop the light from hitting it the way film does.
03-26-2008, 05:55 AM   #8
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YouTube - Shutter Speed

YouTube - Aperture

03-26-2008, 06:02 AM   #9
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QuoteOriginally posted by konraDarnok Quote
There is no shutter on a digital.
Pardon? My K10D has an electronically controlled vertical-run focal plane shutter - its what goes 'clunck'when I press the shutter release...

Last edited by Talisker; 03-26-2008 at 06:03 AM. Reason: correcting html
03-26-2008, 06:28 AM   #10
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QuoteOriginally posted by Talisker Quote
Pardon? My K10D has an electronically controlled vertical-run focal plane shutter - its what goes 'clunck'when I press the shutter release...
Does it? I may be very wrong. I'll have to look this up.

Steve's Digicams - Tech Corner - September 2007

Well take anything I post with a grain of salt. . as apparently I don't know what I'm talking about.

Last edited by konraDarnok; 03-26-2008 at 06:35 AM.
03-26-2008, 06:38 AM   #11
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Shutter

Yup..... Shutter here too !!
03-26-2008, 06:46 AM   #12
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Wow, thanks guys! I didn't know, that the mirror is not the shutter, but is so reasonable, when someone explains that.
03-26-2008, 12:05 PM   #13
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QuoteOriginally posted by pentagor Quote
Don't laugh guys....but here it is:
Can I change the lens if the film is in the camera? Does the mirror hold all the light away from film?

Wow, this is really a rookie question, but I'm still concerned....

Thanks!
This was a great question as I too am a newbie and thanks to all the folks who took the time to answer.
03-26-2008, 07:34 PM   #14
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QuoteOriginally posted by konraDarnok Quote
DSLRs don't have a shutter.
Sorry for picking on you here but at this point in time, ALL DSLRs have shutters. Aside from sensor size, a DSLR is a film SLR with the image sensor behind a shutter.

it is true that not all digital cameras have shutters, those without shutters are essentually video cameras with the ability to capture a still image off the sensor.
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