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Maxing out the CEM60 - wish me luck!

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#1 jammeymc

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Posted 03 August 2018 - 07:12 PM

Today I mounted the 11" Rasa with the AT65ED as a guide scope, onto the CEM60.  It seats well onto the CEM60 and, once balanced, feels more solid than i thought it would. We are suppose to have decent skies tomorrow, so I look forward to a first light with this combo.  I hope it works well because I hope it's a long time before i have to demount the Rasa - it's a beast to carry around!

 

When i was researching this combo, I couldn't find anyone that had used the RASA with the CEM60 (That might say something about me, hu?) so i thought i would post my experiences with it here as a reference to those, like me, who might be interested.  I'll  try to keep several of my first light results here on this thread - more to come:)

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  • RASA.jpg

Edited by jammeymc, 03 August 2018 - 07:16 PM.

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#2 Dynan

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Posted 03 August 2018 - 07:31 PM

Keep us posted!

And I see that the 'family hero', seemingly uninterested, is keeping close guard on your setup. Three Cheers for the Pooch!


Edited by Dynan, 03 August 2018 - 07:39 PM.


#3 alphatripleplus

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Posted 03 August 2018 - 07:45 PM

What's the total optical payload  - I'm guessing around 42 pounds?



#4 gotak

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Posted 03 August 2018 - 07:45 PM

Isn't the RASA 75lb? The CEM60's payload is 60lb... or is celestron wrong on their website?

 

NVM there's two verison 11" is 45lb.


Edited by gotak, 03 August 2018 - 07:47 PM.


#5 scadvice

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Posted 03 August 2018 - 07:55 PM

11" Rasa is 35 lbs... What, the other scope is 6 lbs? I'm betting your good to go for that focal length.

 

Did you see what Paul Chasse did to his CEM60EC?

 

https://www.youtube....h?v=VTgkFInQTeM


Edited by scadvice, 03 August 2018 - 08:40 PM.


#6 jammeymc

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Posted 03 August 2018 - 07:59 PM

11" Rasa is 35 lbs... What, the other scope is 6 lbs? I'm betting your good to go for that focal length.

That's what i was thinking too scadvice. The RASA weights 43lbs total with the top and bottom bar. I added some threads to the top plate and mounted a 12" V bar for the AT65EDQ. All dressed out, I estimate that I am at about 53-54 lbs. Balance is key and I anticipate not having any issues, as you say, at this FL.


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#7 jammeymc

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Posted 03 August 2018 - 08:01 PM

Keep us posted!

And I see that the 'family hero', seemingly uninterested, is keeping close guard on your setup. Three Cheers for the Pooch!

About the only thing they allow in the back yard is strangers.....but squirrels, cats, turtles, possums, racoons.....watch out, as they become loud and viscous!


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#8 jammeymc

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Posted 03 August 2018 - 08:07 PM

11" Rasa is 35 lbs... What, the other scope is 6 lbs? I'm betting your good to go for that focal length.

 

Did you what Paul Chasse did to his CEM60EC?

 

https://www.youtube....h?v=VTgkFInQTeM

I believe Paul has me beat! Wow!



#9 gardenfish

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Posted 04 August 2018 - 07:47 AM

I am at 46# on my CEM60 and so far no problems. I was tracking with total rms  from .5 to .75  and avg around .58 to .65 after a few adjustments. I have 2 22# and 1 11# counter weight so they are higher up on the mount than what you show on yours and I think it helps keep it a little more stable

 

Congrats on your new mount and setup. I love mine.



#10 jammeymc

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Posted 04 August 2018 - 07:18 PM

So under poor sky conditions,with an average of 6-7 FWHM, i couldn't resist to do a test run last night. I had some thin clouds constantly coming in and out of my frame and realistically only had about 15 minutes of good data.....but, i simply let DSS do it's thing set at 80%.  I didn't polar align as i hadn't planned on doing a first light but when i slewed over manually and saw the cresent nebula, i decided to do a short session.

 

45 - 60S subs, ASI294MC with no flats/subs/bias, UV/IR filter only. This is the complete frame, no crop what so ever.

 

AB Result

 

Given the conditions, and shooting from a red zone, I was pretty impressed. Especially with the color (I did not add any saturation). All i did here was do a hard stretch in PI.

 

I believe the guiding will be significantly better with a good polar align and with better seeing/conditions. I noticed that collimation isn't spot on, so I will need to spend a night fine tuning it. I couldn't do flats because my RASA dew shield hasn't arrived yet.  I posted a snap shot of PHD2. I don't think the CEM60 is going to have any issues what so ever with the RASA......you can't tell a difference in the slewing from when I have my 80mm on it. More to come!


Edited by jammeymc, 04 August 2018 - 07:21 PM.

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#11 jammeymc

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Posted 15 August 2018 - 10:01 AM

I had my first real light with the RASA. Only 2 hours and I'm amazed at the detail that this light bucket can get from my redzone. I've yet to receive my dew cover so i couldn't do any flats, but managed to correct the majority of it.  This was somewhat of a playful exercise, using different methods on the Ha layer (dust & scratches etc...) to bring out the background. I sacrificed some detail but i do like it better. I did move to a TOAG (you can actually see it's shadow in the large star refelction panel). The CEM60 handles the RASA quite well and as far as i can tell, has no problems at this weight level.

 

Ha - 1 Hr

OIII - 1 Hr

 

get.jpg?insecure


Edited by jammeymc, 15 August 2018 - 10:40 AM.

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#12 Real14

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Posted 15 August 2018 - 11:15 AM

Hi,

 

Looks very good.

 

waytogo.gif


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#13 Tattooeddeputy

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Posted 29 January 2019 - 10:58 PM

What camera are you using with your rasa?  Pier looks great too



#14 jammeymc

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Posted 10 February 2019 - 01:19 PM

What camera are you using with your rasa?  Pier looks great too

Thank you....I am using the ASI183MC-C now.



#15 Mike 200K

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Posted 10 February 2019 - 11:12 PM

well, and here is my stupid (newbie) question. with a cooled camera aren't you producing "hot air" just in the middle of your entry pupil?


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#16 scadvice

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Posted 11 February 2019 - 12:49 AM

well, and here is my stupid (newbie) question. with a cooled camera aren't you producing "hot air" just in the middle of your entry pupil?

Actually, I was thinking about that same issue so not so stupid (IMO) of question. I think it can in stagnate air flow, just how much is the question. When I go to NEAF this April that was one of the questions I was going to ask. 


Edited by scadvice, 11 February 2019 - 12:50 AM.

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#17 alphatripleplus

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Posted 11 February 2019 - 09:04 AM

Guys let's stay on topic. If you want to discuss cameras, please continue the discussion in another thread.



#18 mgn

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Posted 23 March 2021 - 04:25 PM

Actually, I was thinking about that same issue so not so stupid (IMO) of question. I think it can in stagnate air flow, just how much is the question. When I go to NEAF this April that was one of the questions I was going to ask. 

Did you ever get an answer on that? I'm very close to pulling the trigger on the RASA 11 and it had not occured to me that my SX814 will produce air disturbance above the centre of the entry pupil.



#19 scadvice

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Posted 23 March 2021 - 10:07 PM

off topic...

 

Did you ever get an answer on that? I'm very close to pulling the trigger on the RASA 11 and it had not occured to me that my SX814 will produce air disturbance above the centre of the entry pupil.

 

 Not really... but the censuses was that the fan would generate enough air flow to prevent any significate image distortion.


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