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09/06/2006 03:53:30 PM · #1 |
I understand the D50 doesn't have mirror lockup by default.
Is it possible to achieve say a 30 minute exposure without mirror lockup? - Or does this cause battery or other problems?
(Thinking in terms of wide-field astrophotography here) |
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09/06/2006 04:03:36 PM · #2 |
I see no problem so long as you have an external (5v?) power supply plugged into the camera. You should be able to use the bulb setting and a time it yourself.
The DC in on mine is an odd shaped connector though, so it might be a rather expensive cord.
Message edited by author 2006-09-06 16:03:49. |
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09/06/2006 04:11:07 PM · #3 |
Thanks for the reply - makes sense. I didn't think lack of mirror lockup is going to cause a problem, just wanted verification.
In fact, on a full charge I'm hoping it might be possible to get fairly long shutter times. Although, I'd want to make sure I finish the exposure and get the image written to the card just before the battery runs out! :) |
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09/06/2006 04:18:32 PM · #4 |
Originally posted by jhonan:
Thanks for the reply - makes sense. I didn't think lack of mirror lockup is going to cause a problem, just wanted verification.
In fact, on a full charge I'm hoping it might be possible to get fairly long shutter times. Although, I'd want to make sure I finish the exposure and get the image written to the card just before the battery runs out! :) |
remember to take into account the effect of the noise reduction setting... if it's turned on, then the camera takes a second shot of the same length with the shutter closed as a reference to remove noise and hot pixels...
therefore, a 20 min shot w/ NR turned on takes 40 min
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09/06/2006 04:22:26 PM · #5 |
if you are worried about shutter vibrations, you can use the hat trick, put a sheet of black card infront of the camera before you start the exposure, start the exposure and whip the card away after leaving some time for the vibrations to stop, and then put it back before ending the exposure. Don't forget to factor in extra time for your exposure.
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09/06/2006 04:48:57 PM · #6 |
Well, it does have a bulb feature, this would enable you to get a 30 minute exposure no problem.
All are correct in regards to the noise reduction, a must for longer shots IMHO.
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09/06/2006 05:11:54 PM · #7 |
i have done as many as 4 30 minute exposures with mine on one battery. Was affraid to go for 5.
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09/06/2006 06:19:59 PM · #8 |
Originally posted by Bugzeye:
i have done as many as 4 30 minute exposures with mine on one battery. Was affraid to go for 5. |
Good to know. Too bad you didn't go for 5 the worst that would happen is that image 5 would not get saved or be corrupt. Just change cards in between shots. lol |
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09/07/2006 09:39:32 AM · #9 |
i forgot to mention. This was with the long exposure NR turned off. I doubt it would make it through 4 photos with it on. But then again who knows the D50 does have awesome battery life.
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09/07/2006 10:38:40 AM · #10 |
Originally posted by Bugzeye:
i forgot to mention. This was with the long exposure NR turned off. I doubt it would make it through 4 photos with it on. But then again who knows the D50 does have awesome battery life. |
I think with long exposures most of the battery is used up holding the shutter/mirror open. If the NR shot is taken with the shutter closed, then it should use a lot less power. |
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09/07/2006 10:45:47 AM · #11 |
Originally posted by jhonan:
I understand the D50 doesn't have mirror lockup by default.
Is it possible to achieve say a 30 minute exposure without mirror lockup? - Or does this cause battery or other problems?
(Thinking in terms of wide-field astrophotography here) |
Mirror-lockup won't be necessary for a 30 minute exposure, since any small vibrations from the mirror being raised will only affect the first 1 second or so of the exposure, which will not have any visible effect on the final image. (1 sec = 1/1800th of the full exposure.)
MLU is most important for exposures in the 4 sec to 1/8 sec range. |
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