parsons wrote:
wow great stuff.
ive being playing around the tc80 and as noted you get gaps. thats because of the delay between the 5min shots which are set as 1sec incrmenets and it wont let you choose 0 as a commad. the best way to avoid it is to pay close attention at the countdown and with carefull attention you can be quicker than 1sec in getting the mirror back up.
your findings of iso400 @5.6x 5min are my exact same settings. also by using so many frames you actually average out any noise problems.
It\'s actually not just the 1 second delay (with a super wide angle the a fisheye the stars don\'t move much in a second, the longer the lens, and the further from polaris the more of an issue it becomes). The biggest problem (with a super wide) is the blend mode. In each exposure, on each end of the trail you get some bleed from the star light, like a little gradient. The \'maximum\', or \'lighten\' mode only takes one set of the gradient, the \'screen\' mode adds it to the gradient of the adjacent exposure so that you end up getting the same as in the middle of the trail, and the gaps disappear (almost entirely).. but you get loads of other issues.
Jan 01, 2009 at 11:47 AM
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