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  #21  
Old 29-05-2017, 07:34 PM
axle01 (Alan)
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There's a good forum on face book for the Star Adventurer mount.

https://www.facebook.com/groups/StarAdventurer/

Al
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  #22  
Old 30-05-2017, 08:10 AM
Jasp05 (Aaron)
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Thanks for the link to the facebook page Alan. I think after having a flick through their posts I've made my mind up.

Going to aim for the HEQ5 mount. Might have to save up a while longer or hope a good deal for a mount comes along.


However I am concerned that If I go with the HEQ5, how much more gear is required accessory wise? (I'd have the telescope, mount, dslr and t - ring adapter).

I've read if you want anything longer than 1 min subs on the mount you will almost certainly need an autoguider?? is this true?
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  #23  
Old 30-05-2017, 10:40 AM
raymo
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The sky's the limit as far as accessories go, but you only HAVE to have a
battery to run the mount, or if working from home, a 12v adaptor so
you can run it off of the mains supply. If you are planning to stack
lots of shortish subs, then the first thing I would get is a cheap
intervalometer off of ebay[$10-20] so you don't have to stand there for long periods of time opening and closing the camera shutter.
When you get this simple setup working well you can decide if you want to delve into all sorts of areas, such as autoguiding, laptop control of the mount etc. Oh! I forgot, a Bahtinov mask is terrific for easy focusing; you can
make your own quite easily from instructions on Utube for a couple of dollars.
raymo
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  #24  
Old 30-05-2017, 11:26 AM
raymo
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I forgot your second question. The length of sub you can get is
directly related to the length of a piece of string. Firstly, the longer
the focal length of your lens/scope the shorter the subs will be. Secondly,
the accuracy of your polar alignment is also factored into the equation,
and other factors include the wind shaking the scope, and the tracking
qualities of your particular mount. Lastly, the nearer your target is to the celestial equator the shorter the subs will be. You can get much longer
subs near the celestial poles.
As a rough guide, from my own experience, with very good polar alignment, using a 1000mm focal length scope, aimed near the celestial equator, you should get a very high percentage of usable subs at 30-45 secs, a good percentage at around 60 secs, and a low percentage at 75-90secs. I have had occasional round star subs at 120, and even one or two at 150.
Obviously, if using a shorter scope you will get longer subs, roughly twice as long with a 500mm lens/scope.
raymo

Last edited by raymo; 30-05-2017 at 11:30 AM. Reason: extra text
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  #25  
Old 30-05-2017, 12:31 PM
axle01 (Alan)
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Thanks Ramo your input is helpful to me also.

Al
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  #26  
Old 01-06-2017, 10:48 AM
raymo
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O.K. have finally found a way to downsize a better shot. Hope it helps.
raymo
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