Astrophotography with the RX10 - Jupiter.

Started Feb 2, 2014 | Photos thread
BertIverson Veteran Member • Posts: 3,813
Re: Question -- Re: Astrophotography with the RX10 - Jupiter.

rich_r wrote:

BertIverson wrote

Why would the exposure be different at 200mm?

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Bert

When you are photographing stars and such there is a general rule that you can have an exposure equal to 500 divided by the (FF equivalent) focal length before the movement of the star becomes a star trail. So for 24mm you get 500/24 = ~20 seconds and 500/200 = ~2.5 seconds.

OK! Got it. He would have had to rise the ISO to 3200 at 2.5 seconds.

Thanks,
Bert

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