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OneSky Newtonian - Astronomers without borders

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#751 jlandy

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Posted 28 February 2015 - 10:30 PM

Glad to help! That kind of thing is exactly why this thread started


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#752 Abhat

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Posted 01 March 2015 - 06:33 AM

I had to crank the adjustment knob of the red dot finder all the way to the limit in one axis to align it.  I found that the cause was that the plastic piece that supports it is not parallel to the scope body.  The finder sits too close to the body anyway, so I'm going to try to make an adapter to raise it about an inch.

 

The focuser felt rough and sloppy to me.  I put some Chapstick on the threads and it feels smooth now.  Chapstick is waxier than grease and not as messy.  It even smells good.

 

 

The RDF seems to be that way. Mine is also cranked in all the way. You may also want to explore attaching a vixen style base and 9X50 Right Angle Finder to the OTA. Some have done it already and there are instructions out there somewhere in this thread. Use the RDF to get in the ball park and finder to center it. Also finder helps you find fainter objects faster without having to switch too much back and forth between Wide Field and High Power Eyepieces.

 

I am not  a fan of grease. But, I like the idea of chapstick. I am going to try that out.


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#753 howard929

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Posted 01 March 2015 - 07:02 AM

Glad to help! That kind of thing is exactly why this thread started

 

 

And why it continues!


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#754 dwheels

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Posted 01 March 2015 - 12:25 PM

Last night there was a break in the rain clouds long enough for me to try out my new OneSky on Jupiter and the moon.  Wow!  It's great.  With my GoScope I can make out bands on Jupiter if I place a 60mm mask on the front to limit CA.  With the OneSky, the bands are obvious.  The moon is also much sharper.  With the 10mm eyepiece and 2x Barlow, the image is crisp and clear.  I love the helical focuser, it's very precise with no backlash.  I'm a happy camper.

 

Don


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#755 dwheels

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Posted 02 March 2015 - 12:50 PM

Does the one sky need much cool down time?  I've been reading that Newtonians need to cool down to get clear images.  I expect it's mainly a problem with larger mirrors.  Does the 5 inch one sky mirror take very long to stabilize?  For instance, if I brought it from a 70 degree room to 50 degrees outside, is 20 minutes long enough?  Would I really notice anything if I just started to use it right off?

 

Thanks,

 

Don



#756 SouthernOracle

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Posted 02 March 2015 - 01:16 PM

One more question as I wait for my scope to arrive.  Since this is an F5 scope, should it appear to have an offset when collimating as shown for the "fast scope" on this collimation guide?

http://www.astro-bab...ation guide.htm

I've collimated slow Newtonians, but I've never had one this fast before so I wanted to make sure before starting out.  The collimation picture from jlandy on the first page of this thread doesn't appear to be offset, but there are no crosshairs in the picture so I can't be sure.

 

Edit: I also found this site (http://www.lcas-astr...gory=telescopes) that says offsetting the secondary is unnecessary as long as the secondary is large enough to intercept the entire light cone.  So now I have no idea which one to use.  Offset or normal?


Edited by SouthernOracle, 02 March 2015 - 01:49 PM.


#757 havasman

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Posted 02 March 2015 - 02:11 PM

Does the one sky need much cool down time?  I've been reading that Newtonians need to cool down to get clear images.  I expect it's mainly a problem with larger mirrors.  Does the 5 inch one sky mirror take very long to stabilize?  For instance, if I brought it from a 70 degree room to 50 degrees outside, is 20 minutes long enough?  Would I really notice anything if I just started to use it right off?

 

Thanks,

 

Don

Don,

There's minimal mass in the OneSky mirror. It cools pretty quickly. Once mirror temp equals ambient, it tracks the temp changes pretty closely. So it has no fan.

I often use mine with cooldown time = setup time. Let us know what you notice.

Simplicity and ease of use are part of its charm.


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#758 havasman

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Posted 02 March 2015 - 02:14 PM

One more question as I wait for my scope to arrive.  Since this is an F5 scope, should it appear to have an offset 

 

Any offset calculated for this scope would probably be smaller than useful.


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#759 Abhat

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Posted 02 March 2015 - 03:21 PM

Does the one sky need much cool down time?  I've been reading that Newtonians need to cool down to get clear images.  I expect it's mainly a problem with larger mirrors.  Does the 5 inch one sky mirror take very long to stabilize?  For instance, if I brought it from a 70 degree room to 50 degrees outside, is 20 minutes long enough?  Would I really notice anything if I just started to use it right off?

 

Thanks,

 

Don

 

Cool down time depends on the difference inside and outside.  It will not an issue in California. On very cold days my AWB without a fan takes decent amount of time to cool. As much as my 8" Dob that has a fan. I purchased a USB powered laptop fan for $10 that I attach to a battery pack I already own and that accelerates cooling.

 

However I do not use the fan as much.  I use it only when I am in a hurry or I plan to do high power planetary observing. Most of the times I grab it and plop it on my deck and hour before I want to observe and that is good enough.

 

This scope is very easy to collimate using the Cheshire eyepiece provided. Do not overthink collimation. If you can see all three mirror clips and primary donut is in the center you are good to go.

 

Before I go for Jupiter i always try split nearby Castor in Gemini. If you can see two steady sharp dots then your scope is ready for the big daddy Jupiter.


Edited by Abhat, 02 March 2015 - 03:25 PM.

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#760 dwheels

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Posted 02 March 2015 - 04:39 PM

Thanks for the replies.  I've never been able to split Castor with my little GoScope.  I'll give it a try with the OneSky tonight, weather permitting. 

 

Don



#761 Abhat

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Posted 02 March 2015 - 04:58 PM

Please start with 130X or more for Castor. You will need to barlow your 10mm Eye Piece. If you can split castor easily then try Beta Mon triple. If you can split the B&C with your AWB then your scope is in ultimate shape.


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#762 Abhat

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Posted 02 March 2015 - 08:24 PM

Took out my AWB for Jupiter shadow trasnit today instead of C102. Made some minor collimation adjustment.

AWB is cracking 210X showing Ganymede, its shadow and GRS simulteneously. Wow what a scope.


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#763 dwheels

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Posted 02 March 2015 - 11:39 PM

I saw the shadow too!  At first I thought it might be just a floater in my eye, so I had my son verify it was there.  I didn't know it was a shadow, I thought it was a silhouette.  But, it was very clear with the 10mm and 2x barlow.  I couldn't make out the great spot.  A better eyepiece might make a difference.  But then my eyesight isn't so great either.  I came back later and saw two of the moons merge and the shadow had moved to the left.

 

Castor was an easy split once I was able to align on it.  It does look like car headlights.  I've got to get something better than the red dot finder.  Objects at high angles are impossible.  Lying on the ground isn't going to hack it.

 

Don


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#764 Vondragonnoggin

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Posted 03 March 2015 - 06:49 AM

I'd recommend low power viewing for the first 20 min or so while it cools if you use right away. All scopes benefit from thermal equalization, but low power views are less critical and should be able to be had right after setup. Nebulae will hold up better images than planetary or higher powered lunar views until the scope has been out for a little while. I would think about 30 min tops if mild temp changes from inside the house to outside, then you can start cranking up power to see where the atmosphere's stability will cap you.

 

This darn weather here is nothing but clouds and rain lately, but I'm chomping at the bit for my coworker to get his OneSky out for a good long session. I think I'm as excited as he is about his new purchase.

 

:)



#765 howard929

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Posted 03 March 2015 - 07:39 AM

Does the one sky need much cool down time?  I've been reading that Newtonians need to cool down to get clear images.  I expect it's mainly a problem with larger mirrors.  Does the 5 inch one sky mirror take very long to stabilize?  For instance, if I brought it from a 70 degree room to 50 degrees outside, is 20 minutes long enough?  Would I really notice anything if I just started to use it right off?

 

Thanks,

 

Don

 

 

FWIW, bringing it outside with a 60 degree temp drop I give it 2 hours for no reason other then I have somewhere safe to place it and to be sure.


Edited by howard929, 03 March 2015 - 07:40 AM.


#766 howard929

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Posted 03 March 2015 - 07:46 AM

One more question as I wait for my scope to arrive.  Since this is an F5 scope, should it appear to have an offset when collimating as shown for the "fast scope" on this collimation guide?

http://www.astro-bab...ation guide.htm

I've collimated slow Newtonians, but I've never had one this fast before so I wanted to make sure before starting out.  The collimation picture from jlandy on the first page of this thread doesn't appear to be offset, but there are no crosshairs in the picture so I can't be sure.

 

Edit: I also found this site (http://www.lcas-astr...gory=telescopes) that says offsetting the secondary is unnecessary as long as the secondary is large enough to intercept the entire light cone.  So now I have no idea which one to use.  Offset or normal?

 

The telescope I received had the proper off-set right out of the box. Not that it matters one bit. The off-set is not a goal of collimation, we don't tweak the off-set,  it's automatic provided the secondary is center/round under the focuser. Once that is set, the off-set is as well.


Edited by howard929, 03 March 2015 - 07:51 AM.

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#767 howard929

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Posted 03 March 2015 - 09:01 AM

Hello Mike Simmons,

 

I just attempted to provide a link for a telescope recco to someone here (as I ALWAYS do) and find that the OneSky is no longer listed on the AWB web site. I feel abandoned. Say it ain't so and they'll be back.


Edited by howard929, 03 March 2015 - 09:04 AM.


#768 MSimmons

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Posted 03 March 2015 - 11:19 AM

I just attempted to provide a link for a telescope recco to someone here (as I ALWAYS do) and find that the OneSky is no longer listed on the AWB web site. I feel abandoned. Say it ain't so and they'll be back.

 

It ain't so!

 

Our inventory shows them as out of stock so the store automatically disabled the page. There are some that have been on the way, and I think they're probably there already. The store manager put the page back up with the note that they are temporarily out of stock. We should know within a day if we have some, or when we will, and get the ordering process going again.

 

Mike



#769 howard929

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Posted 03 March 2015 - 11:34 AM

The Universe has returned and I am whole again. Thank you Mike.


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