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Equipment Discussions >> Mounts

Pages: 1
Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
CG5-GT Homage (and LodestarC)
      #6074447 - 09/11/13 06:28 AM Attachment (17 downloads)

Contrary to what majority say on CN that using a C11 ASGT for long exposures of a few minutes it's impossible at ~1700mm (~F/6) and also that guiding 1700mm with a finder scope is useless, I am happy to prove the opposite.


My setup is:
Telescope - C11 reduced at F6 (~1700mm) with AlanGee reducer + Telrad finder
Mount - CG5-GT pier mounted - aligned on 2+3 stars and one ASPA done
Guider - 200mmFL F/4 mini guide scope + 2x Barlow
Guide camera - LodestarC
Imaging camera- Canon 550D with MagicLantern
Software - PHD 2 Beta 1


I think I obtained better results with PHD2 vs PHD but it needs further testing. Even so I like more PHD2 user interface.
I couldn't use SX software successfully for guiding with LodestarC but probably is my fault. If properly used I don't know is SX software guides better than PHD2.


I confess I was very skeptical about LodestarC being able to guide well because:
- LodestarC + 200mm guider scope + 2x Barlow -> 4.23 arcsec/pixel resolution
- C11 at 1700mm (F6) + Canon 550D -> 0.52 arcsec/pixel resolution
- 1700mm is crazy for CG5-GT
- my C11 has in total ~16kg!


I also confess I didn't believe CG5-GT can guide well for 8 minutes with 16kgs on it and with a C11 with dew shield!
Indeed, there was no wind.

As a side note, I couldn't believe also how useful is the Telrad finder. On the other hand I don't like its appearance/plastic quality and finishing considering its price, but because is so useful I accept its faults.

This post is a homage to CG5-GT (and LodestarC).

I hope this will be useful for anyone crazy enough to buy and wonder if a C11 on a CG5-GT mount is usable and if it can be done some DSO photoghraphy with it.

Below is my setup.


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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: CG5-GT Homage (and LodestarC) new [Re: Moromete]
      #6074449 - 09/11/13 06:31 AM Attachment (15 downloads)

Here is a single 8 minutes M27 exposure taken with the equipment above and guiding with PHD 2 Beta 1.

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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: CG5-GT Homage (and LodestarC) new [Re: Moromete]
      #6074451 - 09/11/13 06:33 AM Attachment (11 downloads)

I forgot to say first M27 image was re-sized to fit CN.

M27 crop from the picture above.


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dragonslayer1
scholastic sledgehammer


Reged: 02/25/12

Loc: SLC, UT
Re: CG5-GT Homage (and LodestarC) new [Re: Moromete]
      #6074462 - 09/11/13 06:43 AM

really awesome Marromete, thank you for that info,
Kasey


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Maverick199
Postmaster
*****

Reged: 02/27/11

Loc: India
Re: CG5-GT Homage (and LodestarC) new [Re: dragonslayer1]
      #6074968 - 09/11/13 12:11 PM

I hope the AVX version lives up to its name. Excellent image.

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t.r.
Post Laureate
*****

Reged: 02/14/08

Loc: Upstate NY
Re: CG5-GT Homage (and LodestarC) new [Re: Maverick199]
      #6075151 - 09/11/13 01:52 PM

Doesn't suprise me at all. I've been saying for quite awhile the mount is capable of carrying the C11 for visual use just fine...now a plug for imaging too, bravo!

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Moromete
professor emeritus


Reged: 02/15/12

Loc: Romania
Re: CG5-GT Homage (and LodestarC) new [Re: Maverick199]
      #6076582 - 09/12/13 09:15 AM

Thx guys.

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