Good exposure for milky way using a star tracker?

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DrJohnEvs New Member • Posts: 17
Good exposure for milky way using a star tracker?

Hi - I have built a barn door tracker and it seems to work well.

I have tested it out and when correctly orientated I can expose for at least 6min at ISO1600 without star trails using a Canon 16-35 f4 lens on a Canon 5DIV.

I have used 4min at f4 and ISO1600 for some images last night however they seem overexposed. The image below is a jpeg converted from the raw file and has had no processing. I know the tracker in this case is not accurately aligned as I can see some trailing.

There is also significant light pollution where I am located and I will seek a darker spot next time.

Advice welcome as to a good starting point for the exposure.

Milky Way 4min at f4 and ISO 1600 and 16mm end of the Canon 16-35mm f4

 DrJohnEvs's gear list:DrJohnEvs's gear list
Canon EOS 5D Mark IV Canon EOS-1D X Mark III Canon EF 100mm F2.8L Macro IS USM Canon EF 70-200mm F2.8L IS II USM Canon EF 300mm f/2.8L IS II USM +2 more
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