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Old Feb 21, 2013, 4:43 PM   #1
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Default What class of SD card is best for star trails

Hi

I am interested in getting into star trail photography. I intend to take multiple images of 20 -30 sec duration and then stack them together. I am using a Canon 450d and Class 4 SD cards. I have found that my camera takes about 20 seconds to write each image to the card, which is far too long for what I am trying to achieve. Would a Class 10 card solve my problem?
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Old Feb 21, 2013, 6:26 PM   #2
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I think the length of time is the Long exposure noise reduction feature. From the Canon EOS 450D Instruction Manual (page 155):Under an normal set of circumstances, a star trail photo shouldn't take any longer to write to the memory card than any other photo.
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Last edited by TCav; Feb 21, 2013 at 6:29 PM.
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Old Feb 21, 2013, 6:27 PM   #3
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Default star trails

Found the answer myself, it helps if I switch off the "long exposure noise reduction" feature.

Thanks TCav.

When all else fails read the instructions.
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Old Feb 22, 2013, 2:11 PM   #4
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G'day K55

Yes mate - those damn instructions - there's just too much to read these days.... !
seriously tho - you have found the answer, good

I also do startrail stuff w- the Pentax, shooting from 200 to 1000 images at a time

fwiw- I use iso-1000; 20 or 30 s per exposure; no NR in use, and stack using Startrails.de software. I start the exposures 20 - 30 minutes after sundown so that the faint glow in the sky for the first few images gives me some background to the actual startrail

I can post some samples if you like
Hope this helps a bit
Regards, Phil
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Old Feb 22, 2013, 5:55 PM   #5
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Also that is of you get an instruction book. I have found you normally have to go on line and search for the manual just get the instructions. Instructions have gotten so complicated and long that manuals are not sent with many cameras these days
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Old Feb 25, 2013, 5:15 PM   #6
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ISO of recording medium

Shutter Speed

f Stop ~ depth of field

Focus

Light meter

~ done ~
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Old Feb 26, 2013, 1:23 PM   #7
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Geez bb

you mean to say that all those lovely 100-page coffee-table books I see about "how-to" photograph the world around us could be replaced by 1/2-dozen lines

Great - love it

Regards, Phil
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