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General photography questions and answers: Discuss D80 Bulb Exposures...Hi, i have just been trying long exposures with my D80 of star trails using the ML-L3 remote shutter (one ...
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Old 13-02-2008, 22:55   #1 (permalink)
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D80 Bulb Exposures

Hi, i have just been trying long exposures with my D80 of star trails using the ML-L3 remote shutter (one click to start exposure, one click to stop it) so theoretically i can leave the camera and come back an hour or so later. But what seems to be happening is that i start the exposure on bulb, aperture of f9. And come back an hour later expecting to press the button and end the exposure. But it appears that nothing happens when i do this because the exposure has already stopped!!!

Anybody know why this is happening? the battery has plenty left (enough for 3 45-60 minute exposures) it was below freezing so i don't know if the temperature has an effect. After the 3rd try i couldn't continue due to the build up of water on the lens.

Is there a maximum bulb time on the D80 or something? please help!

oh and i just looked at the exif data of the RAWs and it turns out that two of the exposures have the exact same shutter time of 1801.3 ??

-also...i had noise reduction turned off
-and also...i realise this wont affect the exposure time but does putting that viewfinder cover on the camera help much? what does it do?

and finally....how can i reduce the colour casts at the top of this attempt? ::: http://i145.photobucket.com/albums/r...opy2Medium.jpg

Thankyou sooo much for help
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Old 13-02-2008, 23:24   #2 (permalink)
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Re: D80 Bulb Exposures

D50 can only do a max of 30 minutes. You might wanna check your manual for the D80's limits.

Edit: just noticed your "exposures have the exact same shutter time of 1801.3 " which is 30 minutes so looks like it's the same for the D80.
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Old 13-02-2008, 23:48   #3 (permalink)
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Re: D80 Bulb Exposures

Grrrrr...silly nikon....can anyone answer the other questions?
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Old 13-02-2008, 23:58   #4 (permalink)
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Re: D80 Bulb Exposures

If you do not cover the eye piece then light can leak into the meter from the eyepiece and thus make the exposure too short. I would not expect this to be a problem at night and as you seem to be getting all the exposure the camera will allow that would appear to be the case.

I should have added I do not know what is causing this colours for certain but are there any lights that could be giving very faint glows that are being picked up with the long exposure. Is it some form of sensor noise. What do you get if you leave the lens cap on for the exposure.

Another suggestion could you take four 15 minute exposures (or more ) and blend them in Photoshop.
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Old 14-02-2008, 00:11   #5 (permalink)
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Re: D80 Bulb Exposures

I'd use the viewfinder cap. Given you don't want any extraneous light and you're exposing for so long it seems sensible to use it.

Dunno what the cast is. I'd use the vf cap and noise reduction to rule those out.

weird that it goes grey in the corners. almost looks like vignetting. I think it possibly is sensor noise tho. You can see horizontal lines near the top. image is a bit low quality and small to be sure tho.

If you take a long exposure with the lens cap on. Open the raw file and push the EV to the max you see similar lines.
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Old 15-02-2008, 19:16   #6 (permalink)
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Re: D80 Bulb Exposures

you leave your camera by itself for an hour??? lol
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Old 16-02-2008, 06:21   #7 (permalink)
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Re: D80 Bulb Exposures

D80 and D50 will only stay open for 30 min. (manual pg.51) "BUT" I shot a 43 min. with the optional Nikon EH-5 AC cord, I guess with the AC cord its more continuous power therefore you get more time. (I'm Guessing this) I got the 43min. because I stopped it there, I will try again and leave it as long as I can with the AC cord and let you know how long it stayed open.
The only way to get multiple hour exposures is by combining a multiple 30 minute exposures together.
Another good thing to do is to use Custom setting 31 (Exp delay) this setting can help reduce mirror shake by flipping the mirror up half a second before the shutter is opened.
Don’t forget to turn it off after you’re finished. or you will be wondering why you cant see any pictures when you think your taking them.

Hope this helps



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Old 17-02-2008, 13:58   #8 (permalink)
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Re: D80 Bulb Exposures

Quote:
Originally Posted by traer View Post
you leave your camera by itself for an hour??? lol
In my own walled garden

And yes...i did think of the battery/ power issue but when i came back to check on it after the 30 minutes it still had half the battery remaining.

Rather irritating that there was absolutely no information of this in the manual, reviews, nikon site or anything before i bought the camera.
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Old 17-02-2008, 17:53   #9 (permalink)
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Re: D80 Bulb Exposures

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Originally Posted by xanda View Post
And yes...i did think of the battery/ power issue but when i came back to check on it after the 30 minutes it still had half the battery remaining.

Rather irritating that there was absolutely no information of this in the manual, reviews, nikon site or anything before i bought the camera.

Quote:
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D80 and D50 will only stay open for 30 min. (manual pg.51)
Its right there in the manual









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Old 17-02-2008, 20:21   #10 (permalink)
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Re: D80 Bulb Exposures

ok well i didnt find that
but still would have been nice if it had been easier to know about before buying it
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Old 18-02-2008, 15:01   #11 (permalink)
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Re: D80 Bulb Exposures

did you ask? not everyone uses the d80 for super long exposures...
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