#21  
Old 29-09-2018, 06:53 PM
Karlzburg (Karl)
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Live view won't pick up faint stars at all, anything over a mag of 2.
Something like Alpha Cent, Acrux, formalhuat, Achernar or Vega will be seen in live view pretty easily.
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  #22  
Old 29-09-2018, 09:40 PM
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Outcast (Carlton)
Still a Noob....

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Cheers Karl on both posts. All adds to my currently limited knowledge base. All this info is invaluable & greatly appreciated.

Cheers

Carlton

Quote:
Originally Posted by Karlzburg View Post
Live view won't pick up faint stars at all, anything over a mag of 2.
Something like Alpha Cent, Acrux, formalhuat, Achernar or Vega will be seen in live view pretty easily.
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  #23  
Old 29-09-2018, 09:42 PM
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Outcast (Carlton)
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Thanks Annette

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Originally Posted by silv View Post
What a frustrating night that must have been. It won't be the last of the sort

While you're still setting up there's no reason for limiting to ISO 800. Just crank up the ISO as far as to see more in live view? Mine can do ISO 24000, I think 1100D can do ISO 6400? Still more light than with 800.
That won't give you outlines of the nebulae, either, but hopefully more stars for focussing, orientation and framing of the desired object. It's great that you have your laptop with you outside. So after importing your first high-ISO-testphoto you can push up the rgb-levels to see even more and maybe adjust your framing.

Just don't forget to set your ISO back to 800/1600.

To reduce noise you a) disable live view during the actual photo session so the camera doesn't produce so much heat b) AND you can turn on "noise reduction" in the camera settings on high ISO and high exposure. c) OR take "darks" at the end of the session with the dust cap on the scope and let a stacking software subtract the noise pixels from the stacked image.

raymo posted a single frame taken with 8" and 1100d at 35secs and ISO 1600. Probably from a darker sky location than you suffer from in Cairns. http://www.iceinspace.com.au/forum/s...d.php?t=137095
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  #24  
Old 29-09-2018, 09:43 PM
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Outcast (Carlton)
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Thanks Bojan

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Originally Posted by bojan View Post
As to Bahtinov mask, this link could help.
Thingiverse is full of useful designs.
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  #25  
Old 29-09-2018, 09:44 PM
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Outcast (Carlton)
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Thanks Glen

Quote:
Originally Posted by glend View Post
This is a good way to insure your in focus,

https://agenaastro.com/farpoint-baht...phy-fp410.html

I use Bahtinov masks on all of my scopes because the eye cannot be trusted. A Duncan Mask works as well on SCTs but mainly for situations where your using a Barlow.
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