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Old Aug 29, 2020, 2:02 AM   #1
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Default What class of SD card is best for star trails?

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. Speed Test essay writer 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?

Last edited by AlejandroMaximus; Aug 30, 2020 at 12:57 AM.
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Old Aug 29, 2020, 12:40 PM   #2
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That sounds like a problem with the camera not the card. If you've got either Long exposure noise reduction or High ISO speed noise reduction set to anything but Off, that could be the source of your problem. You don't want to use Long exposure noise reduction when shooting star trails because the camera will think those stars are noise, and you don't want to use a high ISO setting because the image will contain a lot of image noise that can look a lot like stars.

See https://gdlp01.c-wss.com/gds/3/03000...N.pdf#page=155
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Old Aug 29, 2020, 8:10 PM   #3
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G'day Alejandro

As TCav says - you need to make some changes to your camera setup to remove NR from the equation. You also need to shoot in JPG format ....... after all you are only shooting a black sky with some bright specs across it, and RAW is a bit of a waste here

I have been doing startrails for many years in digital and back to the 1960s with film

The software I use to stack digital images is from Startrails .... an excellent bit of software, free to download and its operations put photo editor software stacking to shame

If you want a PDF talking more about startrail shooting, message me here with your email details

Hope this helps

Has Lumix mirrorless & superzoom cameras and loves their amazing capabilities
Spends 8-9 months each year travelling Australia
Recent images at http://www.flickr.com/photos/ozzie_traveller/sets/
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