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Something for nothing: Celestron C90

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#2426 Jond105

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Posted 08 October 2019 - 03:42 PM

Would anybody here ever recommend the virtuoso 90mm mak from Sky-Watcher. I know it’s essentially the same as the C90, but the mount for tracking and now with the toggle has me extremely intrigued to try one out for ease of use. 



#2427 Jaimo!

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Posted 08 October 2019 - 08:26 PM

Jon, 

I like you thinking, but I have never even heard of the Virtuoso mount...  And I moderate the Mounts forum.  I have been considering a small travel, go-to mount; and like everybody else on this forum, I'm going to recommend a more expensive alternative.  I have my eye on the Skywatcher AZ GTi, and while it is significantly more expensive I feel it has a significantly more upside, as the attached thread has many happy users and can support up to a 100mm f/7 refractor.  Plus it has a tripod and is controlled my your mobile phone.  My friend picked one up at NEAF and he is very happy, although I have yet to see it in action.  Food for thought...

 

penny.gif penny.gif ,

Jaimo!



#2428 Jaimo!

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Posted 08 October 2019 - 08:49 PM

Bill, 

I have bought a few of these packages for myself and friends, hard to find a better deal.

 

The C90 is my current scope as I broke my hand last week...  it is small and lightweight, I can take my scope, mount and tripod out with one hand.

 

J

In reality, I should go out a buy a new scope as the clouds should not be bothering me for 4 to 6 weeks...



#2429 johnhudson922

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Posted 15 October 2019 - 07:39 PM

Here you guys go!

 

Link to larger Astrobin version ;-) 

Attached Thumbnails

  • 10-14 moon JPG Edit - 1500px.jpg

Edited by johnhudson922, 15 October 2019 - 08:16 PM.

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#2430 Jim1804

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Posted 15 October 2019 - 09:59 PM

Here you guys go!

Link to larger Astrobin version ;-)


Great shot! What’s your setup?

#2431 andycknight

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Posted 16 October 2019 - 01:28 PM

4 Craterlets in Plato!

 

Very nice Shot - Well done.

 

Regards

 

Andy.



#2432 johnhudson922

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Posted 16 October 2019 - 01:55 PM

Great shot! What’s your setup?

Thanks! Camera: ASI120MC-S (color)OTA: Celestron C90Mount: Celestron AVXSoftware: Firecapture, Autostakkert!, Photoshop CC


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#2433 johnhudson922

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Posted 16 October 2019 - 01:58 PM

4 Craterlets in Plato!

 

Very nice Shot - Well done.

 

Regards

 

Andy.

Thanks!



#2434 Adun

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Posted 17 October 2019 - 10:58 PM

Would anybody here ever recommend the virtuoso 90mm mak from Sky-Watcher. I know it’s essentially the same as the C90, but the mount for tracking and now with the toggle has me extremely intrigued to try one out for ease of use. 

 

I have that mount (mine is the Orion Autotracker version). With a DIY adapter it can use Skywatcher's app as a hand controller (it becomes a go-to mount).

 

However, I don't use this mount with my C90. The idea is just not appealing from an ergonomics perspective. I only use it for EAA.


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#2435 Jaimo!

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Posted 23 October 2019 - 09:10 PM

Went out this evening before Saturn is completely gone for the season.  Not a great shot, but I have done worse...

 

Sat_201522_e11111111_ap7.jpg

 

C90 f/13.9, CG-5 ASGT, ASI224MC, ~650 frames, AS2!, Registax, Gimp


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#2436 Joe1950

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Posted 23 October 2019 - 09:49 PM

I think it is very, very good. Saturn is a difficult object at this time, It's small, visually, even at 200x.



#2437 Euripides

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Posted 24 October 2019 - 04:39 AM

I would like to make a quick rookie question. I have ZWO 224MC. Until now I am attaching it at the back of the tube with the 1,25” converter.
I’ve noticed that it is possible to attach it directly without the adapter.
Will it be wise? I mean, will this affect somehow the image quality? (Unable to focus properly or anything else that I still don’t have the knowledge)


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#2438 Jaimo!

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Posted 24 October 2019 - 10:33 AM

This is kind of the blind leading the blind... 

 

I use the 1.25" adapter, just so I can rotate the camera and manage the cables, if not, you are at the mercy of the threads.  I also center the planet in the field with an eyepiece, then swap it out with the camera, ultimately I would prefer a flip mirror system, but the back of the C90 is too small to use to flip mirror as it interferes with the focuser. 

 

Jaimo!


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#2439 fcathell

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Posted 30 October 2019 - 10:13 PM

Has anyone noticed any difference in the optical quality of the C90 "spotting" scopes as opposed to the packaged C90s with mounts intended for astro viewing?  I would assume they all come from the same "vat" and no optical grading takes place due to the low cost. 

 

Frank


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#2440 Euripides

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Posted 07 November 2019 - 04:30 PM

And now the tricky part....

 

How do I get rid of them?

 

 

Attached Thumbnails

  • 01.JPG
  • 02.jpg
  • 03.jpg


#2441 fcathell

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Posted 07 November 2019 - 10:08 PM

If these blems are on the corrector, I don't see how they could cause issues with the image. Image issues like this are usually caused by eyepiece projection with blems on the eyepiece's field lens.  Maybe I'm interpreting this wrong based on what I'm seeing in the photos, however.

 

Frank



#2442 eros312

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Posted 08 November 2019 - 12:12 AM

They look like dust on your camera sensor. 


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#2443 Euripides

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Posted 08 November 2019 - 01:49 AM

They look like dust on your camera sensor. 

Nop :-( Sensor is looking good. This is visible as soon as I attach the camera to the tube. There is no issue with the camera lens attached.

 

If these blems are on the corrector, I don't see how they could cause issues with the image. Image issues like this are usually caused by eyepiece projection with blems on the eyepiece's field lens.  Maybe I'm interpreting this wrong based on what I'm seeing in the photos, however.

 

Frank

The 1st picture was taking from the rear side of the tube with my phone, looking into the tube. Firstly I though that this will be inside on the front glass. I've tried to locate it there, but I've failed. The front glass seems to be ok but probably I am wrong cause this will be really small in size.

 

 

 

EDIT

 

I've purchased a lens air blower and pressed a few times from the rear. At least now there are not visible on camera :-)


Edited by Euripides, 08 November 2019 - 06:04 PM.


#2444 Peter Besenbruch

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Posted 11 November 2019 - 04:46 PM

A friend of mine and his daughter joined my wife and I at Hau Bush beach park off Ewa Beach for the Mercury transit. We arrived at about 6:30, ten minutes prior to sunrise. This being Hawaii, sunrise looked something like this:

2019-11-11 Mercury transit-sunrise-surfers.JPG

 

That's Diamond Head in the distance. Those clouds you see diminished rapidly as the sun went behind them. My friend brought a rather complex setup of a 70mm Fluorite with single, 50mm etalon, along with a 107mm fluorite with Herschel wedge, mounted side by side on a Sphinx. We were able to catch a few prominences with the 70mm. I brought a 90mm Maksutov on simple mount. We both tended to use Baader zooms.

 

2019-11-11 Mercury-transit-viewing.JPG

 

My wife took the above images. I caught the sun as it rose through the muck in the 90mm without a filter. Ten minutes later, with filter in place, a much brighter, but still ragged sun looked like it had a blurry dust mote on it. Eventually the seeing settled enough to snap this high tech picture through the Mak with my super high end Nokia 6.

 

2019-11-11 Mercury transit ending.jpg

 

Visually, the results were good enough with the Mak to show granulation, but it was a very boring surface.

 

This being Hau Bush, we also had a bit of drama, as an SUV raced into our parking area, followed by a police SUV. The police man dragged the female driver out of "her" vehicle, while she screamed, "What did I do?" Eventually, he answered that she stole the car. She denied it vehemently; she could prove that she bought it. Other campers came by and spoke with her as she sat cuffed about 20 feet away. Eventually, backup police took her away. By the time we left, the original police man was dusting the car.


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