Re: Reflection in image
Robert Chozick <rchozick@...>
Thanks Roland. Someone had already suggested to me that it could be a need for extension of the secondary by about half an inch. I have used the scope many times and this is the first time this is happened. I think there was a bright star nearby. The iris is close to one of the main stars in Cepheus.
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Robert
On Sep 27, 2021, at 1:14 PM, Brian Valente <bvalente@...> wrote:
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Re: Reflection in image
Emilio J. Robau, P.E.
Maybe this will put an end to the GSO discussions. I did some searching. Teleskop Service sells a baffle addition for the stock baffle sold on GSO RCs which were shown to have light leaks around the secondary baffle and produce similar artifacts to what I experienced and what Robert is experiencing. It is called a light shade baffle and they make them for several size scopes. Apparently the issue was detected back in 2017 by a gentleman named Knute H. Shaffner and in collaboration with Teleskop Service TS started making the baffles. I am ordering one for my 12" GSO and I suppose I could experiment an extension to the baffle, but that would take some time and time is money and is better spent under clear skies.
Thanks Rolando for the diagnosis and the rest of the gang for chiming in. I hope this cures the very annoying artifact I have lived with for a while. I admit, I do like my poor man's RC. Hopefully I will like it even more for now and until I can upgrade.
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Re: Is this tilt in the image train?
What camera was used?
-- Dean Jacobsen Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/
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Re: SH2-171 on Mach2 and new Moravian c3 61000 Pro (Sony IMX 455)
Very nice Andrea. I’d be very interested hearing more about your new camera as you get more time with it. I have been seriously considering it for my next purchase. Did you go with the Moravian CFW? Any additional info or experience you have with their camera and accessories will be greatly appreciated.
Eric
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Is this tilt in the image train?
Hi
Now that I have my new AP1100, I am seeing the starts in their true shapes. Gone are the guiding issues and so on with the new APPM models. So, this is the first image taken as a test unguided at 5 minutes. I took the same image with the autoguider running and it made no corrections. Does this looks like tilt? In your experience is it? CCDInspector shows a tilt in the direction from lower left to upper right. It appears to come from before the focuser since the image changes with a 180 degree shift in the camera rotation. I have tilt adapters both before the focuser (Moonlight nightcrawler) and after. The telescope is that notorious FSQ106, the telescope plagued with this type of issue. Thanks, Tom
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Re: Reflection in image
Andrea Lucchetti
yes, it can always happen. fully agree with the approach.
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SH2-171 on Mach2 and new Moravian c3 61000 Pro (Sony IMX 455)
Hi,
as we had some discussions around the new Sony Cmos and Moravian cameras, I am attaching my first image using the combo Mach2 and Moravian C3. After a number of issues and under a poor sky , I've finally managed to take the image. LRGB bin 2x2, 12x300s per channel 200mm f 3.9( 4.5 corrected) self built newton telescope Mount AP Mach2 C3 61000 pro, gain=0 acquisition in NINA: very poor guiding as it was the very first time for me with PHD2 processing in Pixinsight Compared to the 16803 ccd, this sony sensor has greater dynamic thanks to minimal read noise. in 2x2, it has better resolution than the 16803 and same Mpixel count. in 2x2 has a full well of 200k. I find it very good for RGB and should amazing in narrow band at gain= 2750. the camera tilting plate works well, and ccd seems very well aligned (I didn't need to play with tilt) the cooling is effective but not impressive: I achieved -43 deg @95% power. temperature was indeed very stable even at this high power level. this is the link to the image. https://andrealucchetti.smugmug.com/What-is-new/i-vStTQ56/A Andrea
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Re: Reflection in image
Bill Long
John Hayes reported something similar with the baffle on his 20" CDK. IIRC they sent him a newly designed one.
From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Andrea Lucchetti <andlucchett@...>
Sent: Monday, September 27, 2021 11:38 AM To: main@ap-gto.groups.io <main@ap-gto.groups.io> Subject: Re: [ap-gto] Reflection in image Wow,
a telescope like the CDK20 can have a baffling issue?
I can understand the problem in lesser telescope but in the PW CDK is very strange, no?
you should propose them your retrofit kit :-)
Andrea
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Re: Reflection in image
>>>a telescope like the CDK20 can have a baffling issue? Yeah, but I don't want to get into any bashing here I think they recently changed their baffle design, and it turns out there were some issues. we did send them the feedback and generally Planewave has been great about it, and our hosting partner Obstech has been extremely good at diagnostics and interim fixes. As with a lot of things astronomical, i find it works better when i approach it as a partnership Brian
On Mon, Sep 27, 2021 at 11:39 AM Andrea Lucchetti <andlucchett@...> wrote:
--
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Re: Reflection in image
Andrea Lucchetti
Wow, a telescope like the CDK20 can have a baffling issue? I can understand the problem in lesser telescope but in the PW CDK is very strange, no? you should propose them your retrofit kit :-) Andrea
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Re: What does GTO stand for in A-P mounts (i.e. A-P1100GTO)
On Mon, Sep 27, 2021 at 06:24 AM, fernandorivera3 wrote:
What about:That’s probably it. -- Dean Jacobsen Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/
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Re: Reflection in image
Emilio J. Robau, P.E.
I don't want to goober up the AP list too much, and I do own an AP1600 upon which the scope sits, so reference to the baffle leak article would help my baffling artifact.
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Re: Reflection in image
Stone, Jack G
There were some articles written on the 12” when it was first released. One of which was a baffle leak – I tried to google it but to no avail. But it was reported both in the US and UK predominantly – Also was the mirror support design – there were modifications as well, seems as though there were some distortions. There were other mentions as well – If anyone has any references to these articles – would be appreciated.
From: main@ap-gto.groups.io <main@ap-gto.groups.io>
On Behalf Of Brian Valente
Sent: Monday, September 27, 2021 11:14 AM To: main@ap-gto.groups.io Subject: Re: [ap-gto] Reflection in image
you might try extending the baffle a few inches (or experiment) and see if you can eliminate it?
I had a similar issue on my cdk20. After I isolated the cause using paper baffle extensions, my solution was to 3d print a baffle extension and attach it
Problem gone.
Brian
On Mon, Sep 27, 2021 at 10:55 AM Emilio J. Robau, P.E. <ejr@...> wrote:
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Re: Reflection in image
you might try extending the baffle a few inches (or experiment) and see if you can eliminate it? I had a similar issue on my cdk20. After I isolated the cause using paper baffle extensions, my solution was to 3d print a baffle extension and attach it Problem gone. Brian
On Mon, Sep 27, 2021 at 10:55 AM Emilio J. Robau, P.E. <ejr@...> wrote: Robert, --
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Re: Reflection in image
Emilio J. Robau, P.E.
Robert,
I have been fighting the same thing on my 12"GSO RC for years. I have a truss system. If you find a remedy, please let me know. Recently I placed protostar flock on the tube portion of the scope to make it even darker, but I doubt it will help. It seems to happen when my scope is pointed between 10 degrees and 30 or so degrees, and is less frequent when I am pointed more towards the zenith. I think it also happens when there is a bright star nearby.
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Re: Some APCC mis-information on Cloudy Nights
Hello gentlemen,
First, welcome, Tom, to the Astro-Nuts. This is a great group of people with extensive experience using AP mounts. Their knowledge is tremendous. First-time AP mount users are often overwhelmed, so don’t feel alone or hesitate to throw your questions out.
Regarding your request for videos… it’s on the (very long) list of things to do. We realize visual guides are helpful for many users and certainly expected by the younger generations. Our delay is due to many other projects in the queue and the fact that none of us are skilled video makers. Nevertheless, we will be working on this in the near future.
Thank you to all our other members who are trying to help Tom.
Wishing you all clear skies, Karen AP
From: main@ap-gto.groups.io <main@ap-gto.groups.io>
On Behalf Of Bill Long
Sent: Saturday, September 25, 2021 5:00 PM To: main@ap-gto.groups.io Subject: Re: [ap-gto] Some APCC mis-information on Cloudy Nights
Thats easy enough to do. Once you have everything connected and the mount powered on, you can use APJog (installs with the V2 Driver package) to connect and move the mount around.
From:
main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Thomas Giannaccini <tgiann3@...>
Thank you Bill, I think if I can get the mount to move via PC tonight I'll consider the day a success. Haha
Tom
On Sat, Sep 25, 2021 at 3:52 PM Bill Long <bill@...> wrote:
-- Karen Christen Astro-Physics
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Re: Shipping box and foam for Mach1
Yes, we do. Karen AP
From: main@ap-gto.groups.io <main@ap-gto.groups.io>
On Behalf Of Patrick Spencer
Sent: Sunday, September 26, 2021 12:48 PM To: main@ap-gto.groups.io Subject: [ap-gto] Shipping box and foam for Mach1
Does anyone know if AP still sells boxes and foam that can be used to ship a Mach 1? I know there was a recent discussion about buying boxes for the 1100GTO, but I'm wondering about the Mach1, since it's no longer in production? -- Karen Christen Astro-Physics
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Re: What does GTO stand for in A-P mounts (i.e. A-P1100GTO)
Tom Blahovici
Actually, the true story is that 20 years or so ago, the plaques for the first goto mount were sent to the paint shop. When it returned, it was seen they accidentally dropped an O. They stuck with it.
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Re: Reflection in image
Roland Christen
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-----Original Message-----
From: Robert Chozick via groups.io <rchozick@...> To: main@ap-gto.groups.io Sent: Mon, Sep 27, 2021 10:24 am Subject: Re: [ap-gto] Reflection in image Thanks. It is an 8 inch RC.
Robert
On Sep 27, 2021, at 10:10 AM, Roland Christen via groups.io <chris1011@...> wrote:
-- Roland Christen Astro-Physics
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PA Error what is acceptable for 530mm FL & 2.1arc sec/pix
Shailesh Trivedi
Hi,
I ran a 290 point APPM model last Friday and am having trouble centering to a target (I am off by several degrees). Ray suggested "Plate Solve and Recal" in APPM, but I noticed something odd in looking at the Model numbers. The polar elevation is -600 something arc seconds and the polar azimuth is -300 something, see attached. I know that APPM is expected to correct for PA errors, but for a 530mm FL and image scale of 2.1 arc sec per pixel, is this error too much? I prefer to dial it down to less than 10 arc sec, but the night I did my PA with PEMPRO, I was chasing the seeing in suburban Sacramento. Please shed light. thanks. Shailesh
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