Aug 30, 2011 14:40 | #1 Hi - I want to have a go at some star trails when in Cornwall this week and hav the choice of a 17-40mm f4 or a 24-70 f2.8. I've heard that if I use the f4 I will need to push the ISO up which will result in more noise. Can someone let me know if this is their experience please? "No one ever grew by being measured...."
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Aug 30, 2011 15:55 | #2 I've taken lots of star trails @ f3.5 with @ 15mm on my 15-85 lens & T1i.   Mike R, P.E. ...iMac 27"(i7), iPad2, iPhone14Pro, AppleTV4K, MacBook
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Sep 01, 2011 11:42 | #3 Thanks - nice shots. One question I can 't see answered anywhere is that when I take a number of shots to stack, will the stars be that visible? What I was wondering is whether you have faint stars and by stacking them they become brighter ? or whether you see stars in each one and you stack them to get the movement? Also dark frames are just four or five 'normal' exposures? Thanks "No one ever grew by being measured...."
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martyn_bannister Senior Member 568 posts Joined Jul 2010 More info | Sep 02, 2011 02:46 | #4 IainUK wrote in post #13035924  Thanks - nice shots. One question I can 't see answered anywhere is that when I take a number of shots to stack, will the stars be that visible? What I was wondering is whether you have faint stars and by stacking them they become brighter ? or whether you see stars in each one and you stack them to get the movement? Also dark frames are just four or five 'normal' exposures? Thanks Stacking, with something like DeepSkyStacker (DSS), can only improve the signal/noise ratio for the overall result so, no, it will not show up under exposed stars. It might bring them out of the noise, but it cannot improve the exposure. However, post processing of levels might help. Best to get all the stars exposed in the first place.
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Sep 02, 2011 09:10 | #5 IainUK wrote in post #13035924 Thanks - nice shots. One question I can 't see answered anywhere is that when I take a number of shots to stack, will the stars be that visible? What I was wondering is whether you have faint stars and by stacking them they become brighter ? or whether you see stars in each one and you stack them to get the movement? Also dark frames are just four or five 'normal' exposures? Thanks Dark frames = same exact as light frame setting, just put your lens cap on . This will capture the unique red/green pixels from sensor noise that the satcking software uses to identify them and replace then in your light frame final image. Mike R, P.E. ...iMac 27"(i7), iPad2, iPhone14Pro, AppleTV4K, MacBook
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Sep 03, 2011 14:34 | #6 Great - many thanks guys much appreciated. The only issue now is that it's been raining for the last 24 hrs! "No one ever grew by being measured...."
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thakursam Member  53 posts Likes: 1 Joined Mar 2010 Location: Jersey City, NJ More info | Stacking in Astrophotos is common practice along with dark-Subtraction. Sameer Thakur
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MadTony Senior Member  430 posts Likes: 7 Joined Feb 2005 Location: Colorado More info | Sep 13, 2011 01:01 | #8 Awesome firefly start trail shot, mtbdudex! Adam Pender
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Sep 15, 2011 14:28 | #9 Stacking in Astrophotos is common practice along with dark-Subtraction. But if you are planning to Stack for Star Trails then I would suggest to use StarTrails http://www.startrails.de/html/software.html This is freeware specially created for Stacking Star Trails. Best of Luck Sameer Thakur Hi - I'd like to use that but can't as I use a Mac... "No one ever grew by being measured...."
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Sep 16, 2011 12:06 | #10 MadTony wrote in post #13094543 Awesome firefly start trail shot, mtbdudex! Thx. No problem, I uses this program on my 27" i7 iMac. Copyright © by Markus Enzweiler. StarStaX is a fast multi-platform image stacking and blending software, which is developed primarily for Star Trail Photography. Besides star trails, it can be of great use in other settings, see here. StarStaX allows to merge a series of photos into a single image, where the relative motion of the stars creates structures looking like star trails. StarStaX is available as Freeware for Mac OS X, Windows and Linux. Mike R, P.E. ...iMac 27"(i7), iPad2, iPhone14Pro, AppleTV4K, MacBook
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Sep 17, 2011 11:48 | #11 No problem, I uses this program on my 27" i7 iMac. Stacking software: http://www.markus-enzweiler.de/StarStaX/StarStaX.html Quote: Perfect thanks! Now I have to wait for the moon to disappear and for it to be a clear night. Not easy in the U.K. "No one ever grew by being measured...."
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