Telescope Reviews: ETX twin ports

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nytecam
Postmaster

Reged: 08/20/05
Posts: 5750
Loc: London UK

ETX twin ports new

#3404272 - 10/22/09 02:12 PM

I'm using both ports on my ETX-70 - top port for DSO camera and rear port with lightweight SX Lodestar with grating within as a spectrograph switched via the flip-mirror.

Focus, as yet, is not parafocal

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Nytecam 51N 0.1W
Meade 30cm LX200+ETX-70+e-finder+C8+Ha+CaK PSTs SBIG SGS+homebuilt spectrographs
Starlight SXVF_M9+Lodestar CCDs/Canon 300D DSLR/Fuji E550
My observatory build-ETX-70 imaging-my videos

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nytecam
Postmaster

Reged: 08/20/05
Posts: 5750
Loc: London UK

Re: ETX twin ports new

[Re: nytecam]
#3411316 - 10/26/09 05:43 AM Attachment (9 downloads)

Talking to myself again

here's a shot from last night of M42 through ETX-70 - on right is the 'normal' view and offset to left is the H-alpha and OIII/Hbeta monochromatic images via the spectral grating

Note how detached nebula M43 above M42 seems to have no OIII/Hb emission - only H-alpha. The horizontal streaks are stars that have a complete or continuous spectrum

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nytecam
Postmaster

Reged: 08/20/05
Posts: 5750
Loc: London UK

Re: ETX twin ports new

[Re: nytecam]
#3411319 - 10/26/09 05:50 AM Attachment (7 downloads)

Here's the trio of Jupiter [orange], Uranus [blue] and Neptune [grey] spectral profiles that shows, in the 'dips', methane in their atmospheres - Uranus and Neptune essentially identical

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Shadowalker
Unpretentious Rocket Scientist

Reged: 11/23/04
Posts: 3529
Loc: Poplarville, MS, USA

Re: ETX twin ports new

[Re: nytecam]
#3411655 - 10/26/09 10:53 AM

This is very good work, Nytecam. I'd be interested in learning more about your homebuilt spectrographs.

--------------------
Tom Nicolaides
http://www.first-light.org
My evil self is at that door, and I have no power to stop it
-- Dr. Edward Morbius

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nytecam
Postmaster

Reged: 08/20/05
Posts: 5750
Loc: London UK

Re: ETX twin ports new