Jump to content


Photo

Officina Stellare Veloce RH 200 2nd Light Report

  • Please log in to reply
14 replies to this topic

#1 Harel_Boren

Harel_Boren

    Vendor-The Boren-Simon PowerNewt Astrograph

  • -----
  • Vendors
  • Posts: 1179
  • Joined: 15 Mar 2009
  • Loc: Israel

Posted 19 January 2013 - 05:22 AM

This is the 2nd time in the field – I had spent the night at Tal Faibish's place in Eilat (the very southern tip of Israel, where the boarders of Jordan, Israel and Suadi-Arabia nearly touch), and this allowed us to reach our desert location by 5pm, and start of imaging at 6:30pm.

Our location

My son Ben, who accompanied us that night, shot several images, including panoramas, of the place.
Though it's desert, you are able to see the snow-covered mountain tops in the Jordanian side of the boarder, a few miles away.
I know it may look like "Curiosity images of Mars" to some of you, but no … - it's the Israeli Negev Desert :roflmao:

Panorama #1: http://www.pbase.com...148323020/large (you may like to press "original" under the image, and get a hi-res view… It's lovely).
Panorama #2: http://www.pbase.com...148323021/large
And the snow covered mountain tops: http://www.pbase.com...148323022/large
With some images of the sun rising on the desert road, on the way back: http://www.pbase.com...148322997/large and http://www.pbase.com...148322999/large

The setup

We didn't bother the ASA DDM 60 for the Veloce that night, but simply used the NEQ6 with guiding.

We've used a paper-made dew shield for the guiding scope, and an off-the-shelf dew heater for the Veloce RH 200.
You can see images of the setup, as it was still pointing to Ursa Major, at the end of the night (temperature: -2 C degrees):
http://www.pbase.com...148323004/large and here: http://www.pbase.com...148323006/large

Focus / Bahtinov Mask Focusing

We used a pre-prepared Bahtinov Mask, which we've prepared to spec (focal length, etc.) and had laser cut from fiberglass.

We tried focusing without a motor focus, using the Bahtinov mask, and we find it near impossible to reach the required +/- 20 micron zone, which is the calculated Critical Focus Zone (CFZ) for this short focal length telescope.

With the motorfocus is was a walk in the park - took us about 60 seconds to reach perfect focus (+2.6 micron) measured using Bahtinov Grabber, on Sirius.
The focus was finished at 18:30, and after guiding was set up (using PHD) the first actual object 10 min. frame came in at 18:46.

Focus was sustained, with no change, till the last frame came in at 04:02 in the morning. The temperature change during this 10 hour stretch was ~ 14 C degrees (from ~ +12 C down to ~ -2 C).

Here's a one-minute image, with its respective measured roundness and FWHM: http://www.pbase.com...148384113/large

Astrodon Gen II filters parfocal performance

These filters proved to be PERFECTLY parfocal. No focus change was done or required while changing from color to color and from color to luminance. Astrodon filters is one of the purchases I just keep being happy about time and time and time again. :bow:

Field Flatness

We can actually say nothing here, except that the scope delivers a perfectly lit and flat field, across the whole frame of the SBIG ST 8300.

No flats were employed to create this stack of twenty two 10 minute frames, and the measured flatness graph which was done on a random one is pasted to the top-right of this image.

http://www.pbase.com...148384163/large

Summary
All in all, the Powernewt has gained a worthy brother with which it will, alas, have to part of our planned long imaging trips abroad (as the Veloce is more compact and easier to travel with). :jump:
Looking back, this is a lot of hassle considering that our Southern-Hemisphere imaging location in the Kalahari (Namibia) has some pre-fit imaging scopes at hand, which one can use from a cozy warm room just underneath their dome. However, we both find no fun in using someone else's scope, on someone else's computer, using someone else's camera and someone's preset SW :cool:

Quite crazy, wouldn't you say? ... But isn't this whole hobby a crazy endeavor for people (just a little) out of the right minds? :)

Cheers,
Harel

#2 orion69

orion69

    Viking 1

  • -----
  • Posts: 989
  • Joined: 09 May 2010
  • Loc: Croatia

Posted 19 January 2013 - 06:42 AM

Thanks Harel, great report!

I'll say again, that sustained focus is really impressive, perfect for my needs, I have to refocus every hour with my imaging refractor...

I'm not able to post post picture of my setup (regarding ability to use OAG with RH200) because I can't return home for a week. But I thing that using OAG with RH200 should work without problem because TSOAG9 + spacer + Atik FW + Atik 383L+ (later probably Atik 460) use less than 55 mm backfocus. I'll probaly would have to use some spacer between focuser adapter and OAG.
Imaging train would be:

1. Officina Stellare Adaptor to M48x0,75 for the Veloce RH 200 ( http://www.teleskop-...fficina-Stel... ) --> 2 mm

2. TSOAG9 --> 9-12 mm

3. Adapter OAG to Atik FW --> 2 mm

4. Atik filter wheel --> 22 mm

5. Atik 383L+ mono --> 17mm , or Atik 460 mono --> 13 mm

So used backfocus is much less than 70mm (if that info for RH200 backfocus is correct, but I'll check that of course)

#3 Harel_Boren

Harel_Boren

    Vendor-The Boren-Simon PowerNewt Astrograph

  • -----
  • Vendors
  • Posts: 1179
  • Joined: 15 Mar 2009
  • Loc: Israel

Posted 19 January 2013 - 07:49 AM

Thanks Knez,

I think you may be wrong. I think that the backfocus cited may be the distance from the backplate, not from the focuser... I suggest you check this very well.

Also, in regards to using rings as compared to the double-dovetail default structure - I would recommend the latter, as it completely eliminates any flex issues, since the whole structure becomes one bulk.

Cheers,
Harel

#4 orion69

orion69

    Viking 1

  • -----
  • Posts: 989
  • Joined: 09 May 2010
  • Loc: Croatia

Posted 19 January 2013 - 08:20 AM

From RH200 manual ( http://www.officinas...ort.php?idcat=6 ):

"We wish to remind You that the backfocus of the Veloce RH200 is about 115mm calculated from tha back plate of the scope."

How much is from back plate to the tip of the focuser?

But you are right, that must be checked, I'll check that from OS directly.

#5 Harel_Boren

Harel_Boren

    Vendor-The Boren-Simon PowerNewt Astrograph

  • -----
  • Vendors
  • Posts: 1179
  • Joined: 15 Mar 2009
  • Loc: Israel

Posted 19 January 2013 - 04:23 PM

Well, I tried it and am skeptical it would work together. .. I hope it will thought :)
Cheers,
Harel

#6 orion69

orion69

    Viking 1

  • -----
  • Posts: 989
  • Joined: 09 May 2010
  • Loc: Croatia

Posted 19 January 2013 - 06:35 PM

Harel, judging from your picture ( http://www.pbase.com...148323006/large ) there is at least 20 mm space between tip of the focuser and filter wheel, more than enough for TSOAG9 with Lodestar guider.
But I think I understand why you had problems, design of SBIG filter wheel and camera is completely different from Atik's. There is much more room for guiding camera with Atik's design.
Also Lodestar guider is narrower compared to Qhy5 cameras.

I hope I'm right about this because as I said before, I simply don't want instrument that can't use OAG.

#7 David Pavlich

David Pavlich

    Transmographied

  • *****
  • Administrators
  • Posts: 27222
  • Joined: 18 May 2005
  • Loc: Mandeville, LA USA

Posted 19 January 2013 - 10:39 PM

Geez, Harel...the first panoramic view looks like if came from one of the Mars rovers! :grin: Quite the setup you guys have.

David

#8 Harel_Boren

Harel_Boren

    Vendor-The Boren-Simon PowerNewt Astrograph

  • -----
  • Vendors
  • Posts: 1179
  • Joined: 15 Mar 2009
  • Loc: Israel

Posted 20 January 2013 - 06:12 PM

Geez, Harel...the first panoramic view looks like if came from one of the Mars rovers! :grin: Quite the setup you guys have.

David


Well David, I'll go by your signature and say that a cold dry desert can't buy you happiness, but it sure can bring some dark skies while you're sitting out the night with your teeth and bones clanking from the cold :roflmao:

Cheers,
Harel

#9 broca

broca

    Surveyor 1

  • *****
  • Posts: 1586
  • Joined: 26 Mar 2010
  • Loc: Ocala, FL

Posted 20 January 2013 - 08:39 PM

Nice report Harel and nice imaging location!

#10 Harel_Boren

Harel_Boren

    Vendor-The Boren-Simon PowerNewt Astrograph

  • -----
  • Vendors
  • Posts: 1179
  • Joined: 15 Mar 2009
  • Loc: Israel

Posted 21 January 2013 - 01:54 PM

Nice report Harel and nice imaging location!


Thanks Steve,

I like that imaging location, but there are even more desolate ones deeper in the desert, to which we can get only via 4x4.

One of them is imaged here (Lightning River...):
http://www.pbase.com...129386102/large

Cheers,
Harel

#11 orion69

orion69

    Viking 1

  • -----
  • Posts: 989
  • Joined: 09 May 2010
  • Loc: Croatia

Posted 28 January 2013 - 07:26 AM

Just to share this information with you: I contacted Officina Stellare and mr.Gino Bucciol confirmed that I should not have any problems using OAG.
He also sent me diagram which shows that travel distance is 16mm and total backfocus is 69.5mm

That is really good news!
I'm still not decided between RH200 and HiperAPO 130...

#12 Harel_Boren

Harel_Boren

    Vendor-The Boren-Simon PowerNewt Astrograph

  • -----
  • Vendors
  • Posts: 1179
  • Joined: 15 Mar 2009
  • Loc: Israel

Posted 28 January 2013 - 11:49 AM

Just to share this information with you: I contacted Officina Stellare and mr.Gino Bucciol confirmed that I should not have any problems using OAG.
He also sent me diagram which shows that travel distance is 16mm and total backfocus is 69.5mm

That is really good news!
I'm still not decided between RH200 and HiperAPO 130...


Knez,

Please send me your mail address, and I will send you something that will make your mind forever...

Cheers,
Harel

#13 SANDRO78

SANDRO78

    Vostok 1

  • -----
  • Posts: 187
  • Joined: 12 Jun 2012
  • Loc: fr

Posted 28 January 2013 - 02:59 PM

Hi Harel
Bravo for the beautiful images!
I was interessé also by this RH, but the focal is less interesting to make images of Galaxies.
I think of turning to a RC 360 which remains more multi-purpose !

In your corner , it is certainemant well for the astro, the air must be dry?

Good sky!
@lex

#14 Astronature

Astronature

    Sputnik

  • -----
  • Posts: 30
  • Joined: 07 Dec 2008
  • Loc: France

Posted 28 January 2013 - 03:41 PM

Hello harel,

Thank you for the test and details for the setup you used.
I am looking for this scope, i note that it must have a motor to focus and no rings ( saving money!)
i enjoy in advance your next night's report on your website!

#15 Konihlav

Konihlav

    Apollo

  • -----
  • Posts: 1240
  • Joined: 05 Mar 2009

Posted 28 January 2013 - 04:02 PM

I'm still not decided between RH200 and HiperAPO 130...

Hi Knez, I am also still undecided, but between ASA 10" and self-made 12" :) (you know, I need it for total painless imaging with full frame CCD and that's the reason to avoid everything ultra fast). I have also upgraded mount so it's not a big deal to get something bigger now :) only bad is that we have 74 days with total cloudy nights in row this winter :( longest frustrating period ever.






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics