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Astrophotography and Exposure delay and remote timer

GeordieStew

UK
4 posts

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GeordieStew Registered since 10th Nov 2011
Sun 29-Jan-12 06:43 PM

Good evening folks

Right...I am starting to get into astrophotography. D7000 + 300mm F/4 + tripod. I need to be able to take 20 x 2 minute "subs". I can get a remote from eBay which does this for me. However, with all default settings I get camera shake. So, I try "Exposure Delay". It may not be long enough for me. Whether it's one or two seconds. So, try MUP. But this requires two presses. Which means my remote can't do it.

Any suggestions? Is there a remote capable? Is there another mode I'm missing? Can I lengthen "Exposure Delay"? Or fix MUP so it requires one click with a fixed delay?

Thanks in advance!

PS I have other tracking equipment and filters too.

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ChrisPlatt

US
515 posts

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#1. "RE: Astrophotography and Exposure delay and remote timer" | In response to Reply # 0

ChrisPlatt Registered since 04th Jun 2011
Sun 29-Jan-12 08:44 PM

You can't lengthen exposure delay mode. It is fixed at about 1 second on the D7000.

You cannot change MUP to one click with a fixed delay. It will take two clicks either with the button or a remote. I don't know if there is some after-market intervalometer that can automatically do two clicks for you.

The shutter delay mode on the D7000 is about 1 second. If you have a very rigid support system, mirror slap vibrations should drop so low during that time that they won't contribute to a soft image. In fact mirror slap vibrations are almost gone at 1/2 second which was the exposure delay time on some earlier cameras.

Also, for the exposures you are taking, the contribution of any residual vibration from mirror slap should be nil. After waiting one second the mirror slap vibration is all but gone, and with a 2 minute exposure any residual vibrations during the next second will contribute practically nothing to the total exposure - especially since you are way-underexposing with those subs anyway.

If you are getting vibrational effects with that setup, I would question the adequacy of the tripod and look for vibration sources other than mirror slap.

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G