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StarAnalyser on Mead LX200 10
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John Springer <johnbspringer@...>
I'm new to using telescopes. I'm using a new LX200 10" f/10 scope, f/6.3 Celestron focal reducer, with a ZWO 1600mm (3.8 pixels, 4656 sensor width). The calculator shows that with the 6.5 mm camera backfocus and the 28 mm nosepiece that came with the camera, that if I add a 7mm StarAnalyser spacer, (for a total grating to sensor distance of 42) I get 3 green flags. The vendor who sold me the telescope hardware told me I needed to put the 2" focal reducer 5.25" inches from the sensor for visual imaging. Does that mean that I should put some extension tubes between the grating and focal reducer to get the 5.25"? Any suggestions on the above configuration?
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R L
On Sat, Sep 5, 2020 at 10:52 PM, John Springer <johnbspringer@...> wrote:
Does that mean that I should put some extension tubes between the grating and focal reducer to get the 5.25"?Yes. you would need to maintain the 5.25 inches distance from sensor to reducer to give the correct focal length reduction. Although 42mm gives you 3 greens, instead of adding a single spacer, you could consider consider adding a 1 inch long extension tube to the nosepiece which would increase the spacing further to 60mm and improve the resolution. Cheers Robin -- www.threehillsobservatory.co.uk Celestron C11, EQ6, ATIK 314, 428 Star Analyser 100,200, ALPY 600,200 LHIRES III Spectrographs |
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R L
On Sun, Sep 6, 2020 at 12:11 AM, R L wrote:
a 1 inch long extension tube to the nosepiecelike this for example https://agenaastro.com/blue-fireball-1-25-spacer-ring-1-extension.html -- www.threehillsobservatory.co.uk Celestron C11, EQ6, ATIK 314, 428 Star Analyser 100,200, ALPY 600,200 LHIRES III Spectrographs |
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R L
On Sun, Sep 6, 2020 at 12:11 AM, R L wrote:
Yes. you would need to maintain the 5.25 inches distance from sensor to reducer to give the correct focal length reduction.How are you already using the camera for imaging? If you are putting it into a 1.25 inch eyepiece holder which already gives the correct distance from the sensor to the reducer, you just need to add the grating and spacer/extension tube to the end of nosepiece Robin -- www.threehillsobservatory.co.uk Celestron C11, EQ6, ATIK 314, 428 Star Analyser 100,200, ALPY 600,200 LHIRES III Spectrographs |
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johnbspringer@...
Thank you for your reply!
Yes, I am using the camer for imaging. I will follow your guidance and add a 1 inch spacer between the sensor and grating while maintaning the 5.25 distance from sensor to scope (which include the length of the f6.3 reducer) |
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Tim Stone
I use the Blue Fireball 1.25" extender from Agena Astro. Works perfectly. :)
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