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Message: <blockquote data-quote="MartinCornwall" data-source="post: 252730" data-attributes="member: 12701"><p>Thanks for the answer Jake and good to see you back. I have successfully used both the internal and my shoot external intervalometers on 30sec exposure and 32 sec interval. I was hoping to get unlimited exposures using the locking mechanism to stack the images when the satellites or ISS pass through the frame and use the whole stack for the star trails. It is quite dark where I live and satellites especially the ISS can be very bright but as they are moving so fast the 2 second gap leaves a large gap between them. I guess i will have to have one body setup for star trails using the intervalometer and another for the satellite passes on the locking mode. If I want clean star trails ie no satellites I have to wait until after about 9.00pm  local time as most satellites are in the shadow of the earth after this time. Thanks again for your answer.</p></blockquote><p></p>