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Suresh
sage


Reged: 08/05/05

Loc: South India
Crab Nebula ,12 inch f4 with ASA reducer
      #5662778 - 02/05/13 12:46 AM

Hi friends,
Afew members were skeptical when i ordered the 12 inch Newtonian weighing 40 pounds without mounting rings and the heavy Losmandy type dovetail.Astrophysics mount handled this like a toy when i fixed the original dovetail and RMS while guiding was showing 0.25.i have not yet fixed the dent on the tube which is preventing the ring holding the tube adequately causing some tube flexion which will reduce the RMS further
I wanted to shoot Crab nebula as it is not an easy target, the first test shot i took 20 minutes to get all saturated stars, so i shifted to 10 minutes x19 .
here is the image and thanks for looking
more details are at the link
Suresh

http://tinyurl.com/b53vrxu


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Crab Nebula ,12 inch f4 with ASA reducer new [Re: Suresh]
      #5662924 - 02/05/13 05:03 AM Attachment (18 downloads)

Hi - nice M1 I use my 12" SCT @ f/3.7 [close to your f/4 Newt] via OSC cam in very brief exp on M1 last December. I'm not suggesting you resort to my brief exps [it suits my work] but why this relatively bright object needs x75 my exp puzzles me

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Suresh
sage


Reged: 08/05/05

Loc: South India
Re: Crab Nebula ,12 inch f4 with ASA reducer new [Re: nytecam]
      #5662982 - 02/05/13 07:32 AM

I guess a mono camera and dark skies make a big difference!

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Mike Wiles
scholastic sledgehammer


Reged: 02/04/09

Loc: Goodyear, AZ
Re: Crab Nebula ,12 inch f4 with ASA reducer new [Re: Suresh]
      #5663585 - 02/05/13 01:23 PM

Suresh,

Excellent job on the image. I have looked at this scope as an option for my AP900, but I have to admit I would have been skeptical about putting it on a Mach 1. Looking forward to seeing more images from this combination.

Mike


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Suresh
sage


Reged: 08/05/05

Loc: South India
Re: Crab Nebula ,12 inch f4 with ASA reducer new [Re: Mike Wiles]
      #5664431 - 02/05/13 10:27 PM

Thanks Mike I'm enjoying the shorter duration required with z
ASA reducer .


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rainycityastro
professor emeritus
*****

Reged: 03/29/10

Loc: Seattle, WA
Re: Crab Nebula ,12 inch f4 with ASA reducer new [Re: Suresh]
      #5664577 - 02/06/13 02:01 AM

Thats a great result Suresh!
Its very impressive that the mach1 was able to carry a 12" newtonian!


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Suresh
sage


Reged: 08/05/05

Loc: South India
Re: Crab Nebula ,12 inch f4 with ASA reducer new [Re: rainycityastro]
      #5664665 - 02/06/13 05:42 AM

Thanks; Rolando pointed out that it would carry with ease , I've just pulled the trigger on the TAK baby FSQ -) just waiting for it

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