I'm using a Canon 30d and a standard lens.
My goal is shooting night time photography (stars and moon) using the bulb mode at f5.0. Problem is, the longer the exposure the increased OVER exposure I get. What am I doing wrong? 
Ariane911 Member  123 posts Joined Oct 2006 Location: Southern California More info | Oct 28, 2006 15:08 | #1 I'm using a Canon 30d and a standard lens. Canon 30d, Elan lle, 1N )
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angryhampster "Got a thick monopod?"  3,860 posts Likes: 3 Joined May 2006 Location: Iowa More info | Oct 28, 2006 15:33 | #2 Well..I think you just found out how photography works Steve Lexa
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mdmedicgod Senior Member 498 posts Likes: 1 Joined Sep 2004 Location: Salisbury, MD More info | Post image... I can tell you that @f5 for 5 seconds will get you overexposure. Canon 1D Mark II
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Mark_Cohran Cream of the Crop  More info | Oct 28, 2006 16:35 | #4 Try ISO 100, f8 and 1/250th shutter speed as the basis for for the moon and vary your exposure from there. Mark
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Oct 28, 2006 16:47 | #5 Ariane911, Sony A6400, A6500, Apeman A80, & a bunch of Lenses.............
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Scottes Trigger Man - POTN Retired  12,842 posts Likes: 10 Joined Nov 2003 Location: A Little North Of Boston, MA, USA More info | Oct 28, 2006 20:02 | #6 Read this, it will probably help: You can take my 100-400 L away when you pry it from my cold, dead fingers.
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Oct 29, 2006 08:50 | #7 Thanks guys for all your help. I did a few test shots (w/out the moon) and it worked. I set the camera to the highest aperature on bulb setting for about 10 minutes and it worked (including a shooting star)...and I used my Canon 100-400mm IS just for the mere fact that I can't see worth a damn:o) I'll give a wider lens a chance tonight and see what comes of it. Canon 30d, Elan lle, 1N )
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akhater Member  163 posts Joined Sep 2006 Location: On earth, unfortunately More info | Oct 29, 2006 12:28 | #8 You can find some tips on how to calculate long exposures here All Day I Dream About Photography
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PhotosGuy Cream of the Crop, R.I.P.  More info | Oct 29, 2006 19:51 | #9 Next experiment I want to try is the moon! This time I want to get five or so moons in one shot! I think you'll find it hard to get the moon exactly where you want it between exposures if you try to do it in one shot. Better to put them together in PS using a Blend Mode. FrankC - 20D, RAW, Manual everything...
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kjonnnn Goldmember 1,216 posts Likes: 148 Joined Apr 2005 Location: Chicago, Illinois More info | Jul 29, 2008 00:58 | #10 PhotosGuy wrote in post #2187749  I think you'll find it hard to get the moon exactly where you want it between exposures if you try to do it in one shot. Better to put them together in PS using a Blend Mode. I did a solar exclipse once using the interval feature on my Canon. Same process would probably work on a moon shot too.
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egordon99 Cream of the Crop 10,247 posts Likes: 3 Joined Feb 2008 Location: Philly 'burbs More info | Jul 29, 2008 07:14 | #11
Reminds me on another forum, a poster had just purchased a tripod and was wondering why his 30 second exposure at noon was all white. I replied "Perhaps you need to learn a little bit about exposure....". He replied back "Uh, I think I have a pretty good grasp of exposure, so why did my picture come out all white?"
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poloman Cream of the Crop  5,442 posts Likes: 7 Joined Dec 2006 Location: Southern Illinois More info | Jul 29, 2008 09:40 | #12
"All those who believe in psychokinesis, raise my right hand!" Steven Wright
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I think he had a grasp of exposure all right! 