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Ceph and Cass

M83 from Sydney


prejto
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I've been working for a while on imaging through my TEC140 using an Astro Physics barlow (2X). With my Moravian G2-8300 camera this is at .575 arc sec resolution, 1940mm fl, or f13.85. I am using an ONAG to guide through. This setup has proven to be rather difficult, no doubt not helped by my lack of experience! Guiding should have been easy but was actually quite difficult for reasons I cannot figure out. It may be an issue with my PMX mount, or the infra red light coming through the ONAG to the ST-i guide camera. That issue, problems with PEC, plus lousy weather has made this a 4 month exercise! The photo is far from perfect. Star color is a bit lacking, and the stars are not as round as one might hope for. This is probably a combination of marginal guiding and barlow distortion. But, on the positive side I think I was able to get a pretty detailed shot of this galaxy. I think I will not be continuing down this path any longer. 140 mm is probably not enough aperture for this focal length and amount of glass (ONAG mirror, barlow, hutec IDAS, filters). It felt like rowing a canoe against a strong current, especially collecting RGB. Perhaps a camera with higher QE would do the trick.

Thanks very much for looking. Comments greatly appreciated.

M83: http://www.pbase.com/prejto/image/151028536

Setup of ONAG: http://www.pbase.com/prejto/image/151028536

Peter

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I've been working for a while on imaging through my TEC140 using an Astro Physics barlow (2X). With my Moravian G2-8300 camera this is at .575 arc sec resolution, 1940mm fl, or f13.85. I am using an ONAG to guide through. This setup has proven to be rather difficult, no doubt not helped by my lack of experience! Guiding should have been easy but was actually quite difficult for reasons I cannot figure out. It may be an issue with my PMX mount, or the infra red light coming through the ONAG to the ST-i guide camera. That issue, problems with PEC, plus lousy weather has made this a 4 month exercise! The photo is far from perfect. Star color is a bit lacking, and the stars are not as round as one might hope for. This is probably a combination of marginal guiding and barlow distortion. But, on the positive side I think I was able to get a pretty detailed shot of this galaxy. I think I will not be continuing down this path any longer. 140 mm is probably not enough aperture for this focal length and amount of glass (ONAG mirror, barlow, hutec IDAS, filters). It felt like rowing a canoe against a strong current, especially collecting RGB. Perhaps a camera with higher QE would do the trick.

Thanks very much for looking. Comments greatly appreciated.

M83: http://www.pbase.com...image/151028536

Setup of ONAG: http://www.pbase.com...image/151028536

Peter

Hi,

I think that is a great image anyway, you should be proud of it.

Regards,

A.G

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