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Finally a Horsehead without huge spikes!

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#1 kfir Simon

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Posted 16 January 2013 - 03:08 PM

Another year and again I couldn't resist imaging this beautiful region.
This time, using the curved spider, I had very high hopes to get an image without the HUGE spike of Alnitak dominating the frame.
For the first time, I could see what lies under the glare of Alnitak.
I'm VERY happy with this modification of the scope!

Hope you agree with me...

Kfir

Larger version here:
http://www.pbase.com...image/148357402

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#2 alpal

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Posted 16 January 2013 - 03:16 PM

It looks great Kfir.
I like that modification - it's a big improvement.

cheers
Allan

#3 CJK

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Posted 16 January 2013 - 03:22 PM

That's just jaw-droppingly fabulous!! :applause:

-- Chris

#4 Leonardo70

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Posted 16 January 2013 - 04:42 PM

Really nice.

All the best,
Leo

#5 rigel123

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Posted 16 January 2013 - 06:08 PM

Terrific Kfir, Alnitak looks great! Those new vanes are definitely keepers.

#6 Mike Wiles

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Posted 16 January 2013 - 08:33 PM

Sooo.....it makes you wonder if/when people who don't have the last name Borel or Simon are going to be able to order/buy one of these. :grin: I love the idea of a ridiculously fast Newtonian. I've looked long and hard at the PowerNewts as well as the pricier offerings from AG Optical and ASA. I just can't get past the huge diffraction spikes that show up in the images....or I'd probably have one already.

Now a 12" f/2.8 Newtonian with a carbon fiber tube and curved vane spider....& feathertouch focuser mated to my ST-8300 & filters would be a match made in heaven for my typical seeing conditions.

Very nice image Kfir. It's one more reason to give the Powernewts serious consideration.

Mike

#7 turk123

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Posted 16 January 2013 - 08:45 PM

One word: Spectacular!

Amazing Job! :bow:

#8 David Pavlich

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Posted 16 January 2013 - 10:32 PM

More good stuff, Kfir!!

David

#9 David Ault

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Posted 16 January 2013 - 11:38 PM

Looks great Kfir!

Regards,
David

#10 Raginar

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Posted 17 January 2013 - 01:10 AM

Kfir, do you notice the spider acting as a spring or any collimation issues? Some of the DIY guys around here have used some of the replacement spiders and noted they did not provide a solid connection for the secondary.

#11 Cristina Cellini

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Posted 17 January 2013 - 09:22 AM

Great image!

Cristina

#12 steve leshin

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Posted 17 January 2013 - 11:39 AM

Incredible clarity and vibrant colors = spectacular image. Well done. Gotta love that scope!

Steve

#13 kfir Simon

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Posted 19 January 2013 - 05:36 AM

Thank you all!

Chris - I have noticed that the spider isn't perfectly stiff - causing some collimation shift as the tube rotates from one side of the sky to the other.
I think it is due the weight of the large secondary mirror.
I found a simple solution - at every new object - I collimate the secondary again.
Since I rarely image an object for longer then +/- 2Hrs -the scope remains in collimation for this 30 deg movement in the sky.

I think that wider vanes will elliminate this effect (the ones I use are 1" wide and there are 1.5" wide in the market)

I hope this helps....

All the best,

Kfir

#14 Bill Snyder

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Posted 19 January 2013 - 03:28 PM

That's quite a nice 82 min image!!
Bill

#15 alpal

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Posted 19 January 2013 - 04:09 PM

Thank you all!

Chris - I have noticed that the spider isn't perfectly stiff - causing some collimation shift as the tube rotates from one side of the sky to the other.
I think it is due the weight of the large secondary mirror.
I found a simple solution - at every new object - I collimate the secondary again.
Since I rarely image an object for longer then +/- 2Hrs -the scope remains in collimation for this 30 deg movement in the sky.

I think that wider vanes will elliminate this effect (the ones I use are 1" wide and there are 1.5" wide in the market)

I hope this helps....

All the best,

Kfir



Hi Kfir,
Well it's a major improvement on this pic without the curved spider using the power Newt.:

http://www.pbase.com...656834/original

I hope you can get a stronger spider to stop that re-collimation problem.

#16 Raginar

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Posted 20 January 2013 - 02:10 AM

Thanks for the kfir! Exactly what I wanted to know.

#17 broca

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Posted 20 January 2013 - 07:13 AM

The curved spider design looks to be quite the performer. Your stars look great, well shaped and sharp. Congrats on a fine image!






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