IMPORTANT! Long time exposures without purpe corner!

Started Oct 19, 2005 | Discussions thread
TPeter Forum Member • Posts: 62
Re: How long is the longest shot you actually take?

some (maybe stupid) questions as I am new to Astrophotography as well as to the KM 5d:

  • I realize that using the Noise Reduction function of the 5D the purple corner is gone. Is your only reason for not using this feature the extended time or are there oither reasons (quality?)?

  • I got a Meade ETX telescope and am using the the 5D as Prime Focus. Unluckily neither in Alt/Az nor in Polar mode (even after motor calibration and drive training) can I get exposures longer than about 15 sec without shift in the stars (the equatorial mount is stable, no vibrations, am using remote shutter, without camera perfect tracking for hours...). Any recommendations???

  • Read somewhere in this forum that AS should be switched off when camera mounted on tripod. Why? Does this also apply when attaching the 5d to a telescope? (I tried both but can't see a difference)

would really appreciate some help / tips !
Thanks

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