which lens should i use with barlow shorty to see saturn"s rings?

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  • Member since
    September, 2013
which lens should i use with barlow shorty to see saturn"s rings?
Posted by fedler50 on Friday, December 27, 2013 6:42 PM

new to this

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  • From: PA, USA, Earth Moderator
Posted by DaveMitsky on Friday, December 27, 2013 7:36 PM

What's the focal length of your telescope?  

http://www.stargazing.net/naa/scopemath.htm

Its aperture (diameter) would also be useful to know in order to determine your telescope's highest useful magnification.

Saturn's rings are fairly distinguishable at a magnification of about 30x.

The simulator posted at http://www.telescope-simulator.com/index.php?option=com_content&view=article&id=45 will give you an idea of how Saturn will look at various magnifications.

Saturn will be positioned about 25 degress above the southeastern horizon approximately one hour before sunrise.

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

  • Member since
    September, 2013
Posted by fedler50 on Friday, December 27, 2013 7:53 PM
6" orion astroview eq
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  • From: PA, USA, Earth Moderator
Posted by DaveMitsky on Saturday, December 28, 2013 12:12 AM

Your scope has a focal length of 750mm so the supplied eyepieces produce magnifications of 30 and 75x.  Saturn can "take" magnification fairly well and powers of 200x and greater work just fine when the seeing is good.  You may want to consider getting a 7 or 8mm eyepiece for higher magnifications, when 2x Barlowed, than 150x.

http://www.cloudynights.com/item.php?item_id=555

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

  • Member since
    September, 2013
Posted by fedler50 on Saturday, December 28, 2013 5:25 AM
thank you,Dave

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