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05/25/2006 03:54:50 PM · #26 |
Originally posted by ralphnev:
Originally posted by dahved:
I guess I find it odd that I can do a 30-second exposure without touching the camera (using self-timer, of course), but nothing longer. |
you can - but you have to have a remote --
my remote (an old model) will time out for 10 hours -sec ..
longest i've ever done was 20 min ... |
That's the frustration (needing to get a remote). If the camera can do a 30-second exposure all by itself, why not a 300-second one?...
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05/25/2006 03:55:16 PM · #27 |
Originally posted by dahved:
Originally posted by Bear_Music:
Sure, but the battery issue is the same if you use a remote or hold it with your finger for a bulb setting. I'm just saying it seems to me the "Time" shutter mode (thanks for that info, wheeledd) would be easy enough to include on just about any dSLR.
It's not that simple, because of the mirror lockup issue; see my previous post. You couldn't use a 2-tap "time" exposure with mirror lockup enabled.
R. |
Now I'm confused. Why can't a dSLR do mirror lockup and then have the next two taps open and close the shutter? |
Cuz then if you DON'T enable mirror lockup (and many people don't) it's a two-tap operation, not a three-tapper. It just gets needlessly complicated, IMO. I mean, I guess they COULD program all this stuff in, but you need to use some sort of menu item to select which mode you're using, 3-tap or 2-tap. How much simpler just to use a simple remote release with a sliding lock...
Why don't the cameras themselves allow PROGRAMMING of longer exposures at the menu level? This I do not know.
R.
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05/25/2006 04:00:18 PM · #28 |
Thanks for your input, Robert. I guess I'm dense on some of this, because I still don't see the issue with 2-tap vs. 3-tap operation. (If mirror lock-up is enabled, the camera should know that tap 1 is to lock the mirror, and taps 2 and 3 open and close the shutter.)
I was just a bit dissapointed when I got my camera, because I thought I could enable mirror lock-up, select bulb setting, and then take exposures longer than 30 seconds using the self-timer.
Separate question: will the RC-1 remote allow me to do this, or do I need to keep pushing the button on the remote for the duration of the exposure desired? Anyone know?
Message edited by author 2006-05-25 16:03:37.
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05/25/2006 04:18:40 PM · #29 |
Originally posted by GeneralE:
I don't think holding the shutter open drains the batteries all that fast -- using the LCD drains the batteries. Every camera I've seen lately has an exposure of 15 seconds or longer. |
General,
It is easy enough to hold down the shutter button for a "Bulb" exposure of 15 seconds. The real advantage of the "Time" mode is that it make it much easier to make very long exposures. I know of some important photographic work that was done using exposures of several hours.
Of course, this was using film. With most of our digital sensors, we would have more noise than image in a four-hour exposure.
From the point of view of digital camera designers, having a time mode has two undesirable consequences:
1) People will accidently trigger a "time" exposure and leave it running. After a few hours, the batteries will be dead. This goes against the basic design principle of making everything shutdown after a relatively short timeout to protect the batteries.
2) People will actually take very long time exposure--and then bitch and moan about the poor noise performance of the camera. Designers want to limit exposures to the range that the camera can handle well.
I agree with dahved that designers could easily make it easier to take long exposures. I would also appreciate that. But I think the designers feel that Bulb exposures are enough for the kind of work that is going to be done with their cameras.
There are digital cameras that are especially designed for astrophotography. I'm sure their shutters are designed to make it easy to take long exposures (hours). Many of them also include refrigeration equipment to cool the sensors. There is less sensor noise when the sensor is cold.
--DanW |
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05/25/2006 04:19:04 PM · #30 |
" When the camera is set to BULB mode, pushing the RC-1 opens the shutter. A second push of the RC-1 closes the shutter. This behaviour is similar to "T" mode mechanical shutter release."
//eosdoc.com/manuals/?q=RC-1
Robt.
I deduce: set camera up on tripod. Enable mirror lockup. Frame picture, focus etc. Tap shutter button to lock up mirror. The use the remote to open and close the shutter.
Message edited by author 2006-05-25 16:20:21.
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05/25/2006 04:19:08 PM · #31 |
Originally posted by dahved:
Thanks for your input, Robert. I guess I'm dense on some of this, because I still don't see the issue with 2-tap vs. 3-tap operation. (If mirror lock-up is enabled, the camera should know that tap 1 is to lock the mirror, and taps 2 and 3 open and close the shutter.)
I was just a bit dissapointed when I got my camera, because I thought I could enable mirror lock-up, select bulb setting, and then take exposures longer than 30 seconds using the self-timer.
Separate question: will the RC-1 remote allow me to do this, or do I need to keep pushing the button on the remote for the duration of the exposure desired? Anyone know? |
Yeah! A RC-1 remote or RC-5 will do it to your rebel. Due to the IR use, your camera can be remote controled by a Palm or Pocket PC handheld devices or other generic "learning" IR remote controlers int the same way.
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05/25/2006 04:59:54 PM · #32 |
Originally posted by Bear_Music:
" When the camera is set to BULB mode, pushing the RC-1 opens the shutter. A second push of the RC-1 closes the shutter. This behaviour is similar to "T" mode mechanical shutter release."
//eosdoc.com/manuals/?q=RC-1
Robt.
I deduce: set camera up on tripod. Enable mirror lockup. Frame picture, focus etc. Tap shutter button to lock up mirror. The use the remote to open and close the shutter. |
Excellent! Thanks. Now why can't the Rebel do that without the remote... :-)
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