AR2574 & AR2575

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[whrudey]
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AR2574 & AR2575

Post by [whrudey] »

Been a while since I've posted any images - spending most of my time in my shop machining parts for the new 12" Solar Newton. Today's conditions quite hazy giving rise to but modest images.
Aug10201607_51_02_g4_ap2478SN1174USB3TV4AS2PPGM.jpg
Aug10201607_51_02_g4_ap2478SN1174USB3TV4AS2PPGM.jpg (670 KiB) Viewed 3563 times
Aug10201607_51_02_g4_ap2478SN1174USB3TV4AS2PPGc.jpg
Aug10201607_51_02_g4_ap2478SN1174USB3TV4AS2PPGc.jpg (683.41 KiB) Viewed 3563 times
Aug10201607_52_26_g4_ap1548SN1174USB3TV4AS2PPGM.jpg
Aug10201607_52_26_g4_ap1548SN1174USB3TV4AS2PPGM.jpg (653.05 KiB) Viewed 3563 times
Aug10201607_52_26_g4_ap1548SN1174USB3TV4AS2PPGc.jpg
Aug10201607_52_26_g4_ap1548SN1174USB3TV4AS2PPGc.jpg (693.41 KiB) Viewed 3563 times
New system seems to be working nicely.

Enjoy,

Bill


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Re: AR2574 & AR2575

Post by ffellah »

Bill: excellent, high quality images !

Thank you for sharing.

Franco


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Re: AR2574 & AR2575

Post by marktownley »

Good results Bill. Was wondering where your images had gone earlier today, hope first light isn't far off with that new scope.


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Re: AR2574 & AR2575

Post by jp-brahic »

Very nice shots!!!

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Re: AR2574 & AR2575

Post by Carbon60 »

Lovely granulation and sunspots, Bill.

Stu.


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Re: AR2574 & AR2575

Post by [whrudey] »

Thanks everyone - comments appreciated.

As for the new scope under construction, in the near future, I'll send some images along showing progress (https://www.solarchatforum.com/viewtopi ... =9&t=20050). Currently working on the RA drive which will be belt driven with a stepper motor, Raspberry Pi and Arduino controller. The belt drive is a good system and, I'd used it before on a split ring mount for another 12" Newtonian - see image below.
Belt drive.jpg
Belt drive.jpg (187.8 KiB) Viewed 3521 times
For the DEC axis, I'll use a tangent arm since the range of movement for solar work is smaller. Currently waiting for an order of steel from Metal Depot for the base and pedestal. Obtaining these materials/parts locally is more than a challenge and, everything has to be imported.

So far have been using the ASI174MM with rather large pixels (5.86um). My sense is that although the 12" scope will have much better resolution (Dawe's limit), the coarser pixels may not pick up full detail within granules. Thus, looking to an ASI290mm (2.9um) even though the FOV will be smaller. Any thoughts on this matter ?

Cheers,

Bill


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Re: AR2574 & AR2575

Post by Montana »

Wow!! these are pretty spectacular :bow

Alexandra


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Re: AR2574 & AR2575

Post by christian viladrich »

Well done Bill !


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Re: AR2574 & AR2575

Post by [whrudey] »

Thanks Christian and Alexandra for your encouraging comments. Remember, Christian deserves credit for being the inspiration that led to my constructing the 8" Solar Newton scope - and, now the 12" scope currently underway.

Cheers,

Bill


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Re: AR2574 & AR2575

Post by MapleRidge »

Hi Bill...

Very sharp WL pics...well done :bow

I find the ZWO174 works quite nicely...any reason not to use a barlow to bump the resolution at the chip? A 2x barlow should provide close to the same resolution, but not much difference in the FOV than the 290. The 290 works quite nicely on its own too.

Brian


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Re: AR2574 & AR2575

Post by [whrudey] »

Hi Brian;

Thanks for responding to my question re: ASI174MM vs ASI290MM. I am using a Televue 4x's PowerMate with which I'm quite pleased. My concern was the very large pixels with the ASI174MM at 5.86 um. I reasoned that I could capture more detail with the ASI290MM at literally half the sized pixels. It makes sense to me - was wondering about others.

Cheers,

Bill


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Re: AR2574 & AR2575

Post by MapleRidge »

Hi Bill...

I think you will find that a 2x barlow ahead of the 174 will give essentially the FOV and resolution as the 290...the pixels and chip array are basically differ by a factor of 2. The 174 has 2x the pixels at 2x the size, a 2x barlow essentially produces the same field/resolution as the 290 with no barlow.

I just wish they has a square version of the 290 great for full disks at shorter focal lengths.

Brian


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Maple Ridge Observatory
Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM

2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: AR2574 & AR2575

Post by eroel »

Bill:
Super white light images.
Your drive looks good. :shock:
Best regards,
Eric.


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Re: AR2574 & AR2575

Post by yltansg »

Hi Bill,

Excellent WL images.

Alfred


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Re: AR2574 & AR2575

Post by [whrudey] »

Firstly many thanks Eroe and yltsang for your kind comments.

Secondly, Brian thanks for you thoughts on the issue of pixel size with the ASI17MM vs. the ASI290MM. Correct me if you think I'm wrong but, my thinking was along these lines. If one keeps the optical train the same and ignores FOV, then placing a 5.86um pixel vs. a 2.9um pixel sensor at the focal plane, finer detail should result with the smaller pixel - literally twice the detail. Much as I like the ASI174MM, it's my sense that when I enlarge my images, fine detail is lost in the granules. Am I missing something.

Yours and anyone else's thoughts welcomed.

Cheers,

Bill


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Re: AR2574 & AR2575

Post by christian viladrich »

Hello Bill,
I don't remember what is the F/D ratio of your 8" ? Now you have mastered the X4 Power mate, you could go for a X6 Barlow lens. I have the FFC Baader, but it is very expensive.
The idea of moving to smaller pixel size is also interesting. 2.9 um pixel could do the job with a X3 Barlow lens. This beeing said, I've not tested the ASI290 camera.
Cheers
Christian


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Re: AR2574 & AR2575

Post by [whrudey] »

Hi Christian;

The 8" version is f/6. The 12" version that I'm currently building will be f/5. Given space considerations, I wanted to overall length down. I wasn't aware that Barlow's came at x6 but, the Baader FFC is quite pricey. I'm pleased with the TV4 though it is quite heavy.

There is some controversy regarding smaller pixel size yet, my thoughts above seemed to make sense to me. Will try out an ASI290MM once the new scope is operational.

Always appreciate your input.

Cheers,

Bill


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Re: AR2574 & AR2575

Post by donnw »

Hi Bill:

New to the group here (first post.) I've been reading what I can on the web, trying to figure out which camera would be a better fit for imaging with my Lunt LS60/B1200 - an ASI174MM or an ASI290MM. I do want to be able to do full disc without stitching. Since you have had both for a year now, what would be your recommendations / observations? Thanks much!

Peace and blessings,
Donn


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Re: AR2574 & AR2575

Post by [whrudey] »

Hi Don;

Almost missed this one since the original post was a year ago. The simple answer is the ASI174MM - love it and am now buying another with built in cooling. Though I bought an ASI290MM for its small pixel size, I've not been all that impressed with it. Could be good for planetary work.

Hope the above is helpful.

Bill


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Re: AR2574 & AR2575

Post by donnw »

Hi Bill:

That's exactly what I was looking for - firsthand feedback from someone who has used both cameras. Thanks much!

Peace and blessings,
Donn


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Re: AR2574 & AR2575

Post by Merlin66 »

Bill,
do you use additional filters? Continuum, Ha or OIII??


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