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Opinions on the Boren-Simon F/2.8 Newt Astrograph

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#1 MDieterich

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Posted 11 December 2010 - 05:46 PM

Hi all,

I was looking to move up from my modified Canon Xsi to CCD for narrowband work here outside Pittsburgh, PA. I recently discovered this scope and wanted people opinions on it for DSLR and CCD imaging in light polluted skies.

http://www.powernewts.com/

Thanks,

Matthew F. Dieterich

Sophomore-Robert Morris University-Environmental Science


Check out my Astro-imaging site below
http://www.pbase.com/mdieterich

#2 Tal Fibish

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Posted 12 December 2010 - 10:03 PM

Hi Matthew,

I took a demo unit out for two nights in November, and I liked it very much.

It is simple to set up and I didn't have to collimate it the first night. The second night I had to collimate it. I think it was a big bump in the road in the morning before that shook the telescope and I needed to collimate it a little (the primary mirror).

I was afraid of the focus and I thought it can be difficult to focus on such short focal ratio, but actually focusing was very quick. After I did flats in the first night, and before I took out the camera, I locked the focus knob on the focuser, and when I started the second night, I did not need to do any focus, till the morning. It just stayed locked.

If you are imaging with a focal ratio of F4 or more, it is really surprising how quickly the dim objects come out. A little bit like magic… This is a special experience.

I am working on one of the processing and will show it here soon.
When I get my unit I will tell you too.
I hope this was helpful.

Tal

#3 astrosharp

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Posted 13 December 2010 - 11:19 AM

Good question! I am also interested to learn more about these scopes. Anyone in the UK got one?

Ian.

#4 Harel_Boren

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Posted 13 December 2010 - 04:06 PM

Guys,

Both of us founders (Boren and Simon) will be happy to answer any questions you may have - here, over email or over skype.

We love the scopes, we love the hobby, and we'll love to shed light - lots of light - on any topic related to it.

Just ask :-)

Cheers,
Harel

#5 fetoma

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Posted 13 December 2010 - 04:50 PM

Harel,

Will you make a version that will have an image circle to cover a full 35mm chip size?

#6 MDieterich

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Posted 13 December 2010 - 10:18 PM

Some great questions being asked here guy thanks!

Tal I am very eager to see your image please post it to this thread when your a done! =)

Cheers ,


Matt

#7 Harel_Boren

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Posted 14 December 2010 - 06:14 AM

Harel,

Will you make a version that will have an image circle to cover a full 35mm chip size?


Hi Frank,

Thanks for this question.
We have been contemplating this, but had eventually voted against it, as it would require too significant changes to be made to the optics and the tubes, which would have made the system far more expensive.

Our partners ASA of Austria carry excellent top-most quality instruments, which do cover a full 35 mm chip, and I'd be delighted to facilitate direct contact if you like.

Please don't hesitate to ping us with any questions on the scope.

Cheers,
Harel

#8 jmasin

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Posted 14 December 2010 - 10:40 AM

Harel,

I have a Q as I've been intrigued by the offering.

It says on the website "can be used as an F/4 (corrector out)". Are there any options for a slightly longer focal length that is still coma-corrected?

#9 Harel_Boren

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Posted 14 December 2010 - 02:20 PM

Hi Jon, and thanks for this question.

The Powernewt can indeed be used at larger focal ratios:
- by not using the PRC: F/4
- by adding any barlow: >F/4

We believe that at larger focal ratio's coma will be hardly visible. However, at any F ratio between F/4 to F/6 we recommend the Baader Planetarium Multi Purpose Coma Corrector (or MPCC for short), with which we have very positive experience (its retail price is about $150).

Please don't hesitate to ping us with any questions on the scope.

Cheers,
Harel

#10 jmasin

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Posted 14 December 2010 - 04:59 PM

great thanks, so a standard CC works in place of the one that the scope ships with. That's what I wanted to know.

Thanks!

#11 Tal Fibish

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Posted 15 December 2010 - 01:05 PM

Matt,
I quickly processed the M45 data from two weeks ago that I took with the demo unit from Powernewt.
I used my old camera - Orion SS Color V2 , because I was afraid that the SBIG STL-11000M might be to heavy for it.

I must say I was supprised to see how much data I got with only 30 min exposure , I use to image with slow F/6.3 telescope.

anyway , that a look :
http://www.pbase.com...image/131160871

#12 MDieterich

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Posted 15 December 2010 - 05:10 PM

Tal my goodness that image is simply beautiful! How long have you been imaging? Where in Israel did you image M45 from. I live in light polluted suburbs and am kind of weary of imaging at F/2.8 with my modified Canon Xsi. I do have the Astronomik CLS light pollution filter though.

#13 MDieterich

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Posted 15 December 2010 - 05:25 PM

Tal also could you explain how you guide with the powernewt. I have a ST80mm on a Losmandy plate on my current setup (click my link, then equipment). Can I use this guidescope setup with the Powernewt without further accessories?

#14 David Pavlich

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Posted 15 December 2010 - 11:33 PM

Hey Mathew...I have my PowerNewt set up with a pair of Parallax rings. It makes mounting my Mini Borg guidescope easy. I just mount a short Losmandy universal dovetail plate on the top of the rings. It works very well.

The only sort of negatives are that the Parallax rings are a bit heavy and they aren't cheap. However, the fit and finish of the Parallax rings makes mounting the scope a breeze!

David

#15 Gary BEAL

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Posted 16 December 2010 - 01:28 AM

Matthew, I don't have the scope that this thread talks about, but have a distant cousin, the AT8" IN. I have used a converted 50mm finder, with the eye lens substituted by the Lodesar, and sitting on top using an ADM Vixen style rail, and ADM Vixen saddles, and ADM finder rings. Wonderful setup.
As soon as I get the ADM saddle mounted permanently on the mount I will attach the finder/guider directly to one side of the saddle, and this will mean the scope (any scope) that is in the saddle also has the finder/guider aligned.
To put extra weight and drag on top just doesn't make sense to me.
Gary

#16 kfir Simon

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Posted 16 December 2010 - 03:31 AM

Tal - Amazing outcome! - well done.
30 min on F2.8 indeed delivers.

Cheers,

Kfir

#17 Tal Fibish

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Posted 16 December 2010 - 06:47 AM

Matt,
I'm imaging for about 2 years now and imaging from the Negev desert in Israel , its very very dark place with no light pollution at all. most of the astrophotographers in Israel imaging in the negev desert , its the darkest place in the country.
for guiding I usually use a smaller refractor (WO ZS70) but in this case I used my old finder that I modified for guiding.

Tal.

#18 MDieterich

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Posted 16 December 2010 - 11:09 AM

Hi guys,

So the consensus is to get a small finderscope? I already have the Orion ST80mm Guidescope package with Starshoot Autoguider. How would I attach that to the PowerNewt? What other costs/accessories would I need to get up and running? I want to minimize tube flex most importantly.

Also Tal I live in light polluted skies. Am I going to have trouble imaging at such a high F/Ratio with the PowerNewt? I have the Astronomik CLS light pollution filter for my modified Canon Xsi.

#19 Gary BEAL

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Posted 16 December 2010 - 05:52 PM

Can't help you with the LP, but the gut feeling I have with the ST80 (I started with one, so know it well) is the simpler option of an old finder is better.
If you can, get one that fits a "foot" like the already installed finder, and have "one each side", thereby assisting with balance.
My main concerns with the ST80 were the tube rings, and the focuser, mainly the focuser. Any movement here is detrimental to the cause.
Try cobbling together a finder-scope guider, you will be impressed.
Shoot me an e mail off group if you need help.
Gary

#20 David Pavlich

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Posted 16 December 2010 - 09:40 PM

Here's a picture of my PowerNewt. I apologize for the lack of quality of image, but it should give you somewhat of an idea how it looks:

[image]Posted Image[/image]

David

#21 Nicola

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Posted 17 December 2010 - 05:19 AM

I do have also a question. Being working for APS size chips, I was wondering if it is possible to use an OAG with this scope...?

#22 kfir Simon

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Posted 17 December 2010 - 06:30 AM

Hello Nicola,

I use this OAG with the POWERNEWT - works very well.
With the M42 adapters - the thickness is only 11mm.
http://www.teleskop-...adaptation.html

Cheers,

Kfir

#23 MDieterich

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Posted 17 December 2010 - 10:35 AM

Hi Guys,

Thanks for the replies. Does anyone have issues with tube flex? Also how strong is the focuser? What is an acceptable limit for camera weight on the focuser/drawtube? What accessories would I need to use my Orion StarShoot Autoguider with a finderscope for guiding?

#24 kfir Simon

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Posted 17 December 2010 - 10:45 AM

Hi,
I sometimes use the Orion Guider - with a 50mm Lumicon finder - the guider enters as a 1.25 eyepiece - no additional adapters needed.
The tube and focuser hold the focus sometimes the whole night.
Regarding the weight on the focuser - I think that all the "normal" cameras with weight of about 1+ Kilogram -won't be an issue!
Hope it helps...

Kfir

#25 MDieterich

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Posted 17 December 2010 - 10:59 AM

Hi Kfir,

I appreciate the help. I am awaiting a reply from Harel. Haven't heard from him in a couple days.

At F/2.8 I am clearing going to have shorter subs than my normal 5min subs with my current F/7 setup. If I understand correctly I am going to gain the same signal I did in my F/7 5 minute subs just in an extremely shorter amount of time. I have a modified Canon Xsi and Astronomik CLS light pollution filter. I have really bad light pollution and I am worried about that affecting my images at F/2.8 with the Powernewt.

Maybe you could try and clarify any difficulties I am having in regards to light pollution and F/2.8 imaging.

Finally, from what I understand I will just increase the S/N ratio to help bring out the most detail at F/2.8

Many thanks






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