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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e
Last night I switched lenses to the 300mm f/4 pentax smc 6x7 lens. this
gives me about 6.19 arc-sec/pixel so I get a pretty big FOV of 5.28 x 3.52 degrees. This was the first time I have used this configuration. This is 3 x 20 minutes per filter and I used the Baader Planetarium [SII]/Ha/[OIII] filters for the image. Unfortunately I did not have a chance to shoot flats so I used one taken over a year ago with a different filter but the same optic. The shot isn't perfect, the focus could have been a bit sharper and it looks like I may want to adjust the lens tilt a smidge. It was really more of a test shot with a new setup. But I am happy with the performance of the Baader filters. This is the longest focal length I have used them so far and the 150mm length made it a bit difficult to really assess the color since the color detail is often quite small in many of these targets. This very familiar object is a real benchmark when it comes to color narrowband imaging of the summer sky: http://www.narrowbandimaging.com/ngc...2hao3_page.htm I plan to move the filters over to the AP180EDT f/9 in the coming month or so and try them on some smaller objects The value is superb: a fellow can do good narrowband for the price of RGB these days with these Baader filters.... |
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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e
Richard,
this certainly looks very good. I may try the "short" version (only Ha and OIII) on this one this year. Stefan "Richard Crisp" schrieb im Newsbeitrag . net... This is 3 x 20 minutes per filter and I used the Baader Planetarium [SII]/Ha/[OIII] filters for the image. Unfortunately I did not have a chance to shoot flats so I used one taken over a year ago with a different filter but the same optic. The shot isn't perfect, the focus could have been a bit sharper and it looks like I may want to adjust the lens tilt a smidge. It was really more of a test shot with a new setup. But I am happy with the performance of the Baader filters. This is the longest focal length I have used them so far and the 150mm length made it a bit difficult to really assess the color since the color detail is often quite small in many of these targets. This very familiar object is a real benchmark when it comes to color narrowband imaging of the summer sky: http://www.narrowbandimaging.com/ngc...2hao3_page.htm I plan to move the filters over to the AP180EDT f/9 in the coming month or so and try them on some smaller objects The value is superb: a fellow can do good narrowband for the price of RGB these days with these Baader filters.... |
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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e
thanks for the comment and for reminding me to do a synthetic Hbeta image:
red = halpha green = [oiii] blue = [oiii] + synthetic hbeta synthetic hbeta = 30% * Halpha I added that image to the page below: http://www.narrowbandimaging.com/ngc...2hao3_page.htm "Stefan Lilge" wrote in message ... Richard, this certainly looks very good. I may try the "short" version (only Ha and OIII) on this one this year. Stefan "Richard Crisp" schrieb im Newsbeitrag . net... This is 3 x 20 minutes per filter and I used the Baader Planetarium [SII]/Ha/[OIII] filters for the image. Unfortunately I did not have a chance to shoot flats so I used one taken over a year ago with a different filter but the same optic. The shot isn't perfect, the focus could have been a bit sharper and it looks like I may want to adjust the lens tilt a smidge. It was really more of a test shot with a new setup. But I am happy with the performance of the Baader filters. This is the longest focal length I have used them so far and the 150mm length made it a bit difficult to really assess the color since the color detail is often quite small in many of these targets. This very familiar object is a real benchmark when it comes to color narrowband imaging of the summer sky: http://www.narrowbandimaging.com/ngc...2hao3_page.htm I plan to move the filters over to the AP180EDT f/9 in the coming month or so and try them on some smaller objects The value is superb: a fellow can do good narrowband for the price of RGB these days with these Baader filters.... |
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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e
Judging by all the red stars it appears most stars don't have a deep
absorption band for Sulfur compared to OIII or H alpha or is there some other reason most stars come through red. Is there a reason the H alpha is slightly narrower? Rick Richard Crisp wrote: Last night I switched lenses to the 300mm f/4 pentax smc 6x7 lens. this gives me about 6.19 arc-sec/pixel so I get a pretty big FOV of 5.28 x 3.52 degrees. This was the first time I have used this configuration. This is 3 x 20 minutes per filter and I used the Baader Planetarium [SII]/Ha/[OIII] filters for the image. Unfortunately I did not have a chance to shoot flats so I used one taken over a year ago with a different filter but the same optic. The shot isn't perfect, the focus could have been a bit sharper and it looks like I may want to adjust the lens tilt a smidge. It was really more of a test shot with a new setup. But I am happy with the performance of the Baader filters. This is the longest focal length I have used them so far and the 150mm length made it a bit difficult to really assess the color since the color detail is often quite small in many of these targets. This very familiar object is a real benchmark when it comes to color narrowband imaging of the summer sky: http://www.narrowbandimaging.com/ngc...2hao3_page.htm I plan to move the filters over to the AP180EDT f/9 in the coming month or so and try them on some smaller objects The value is superb: a fellow can do good narrowband for the price of RGB these days with these Baader filters.... |
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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e
the stars are red because the nebulosity in [sii] is faint so i have to
stretch it more than the others not sure why baader picked the passbands that he did. i'd have made the sulfur and oxygen passbands narrower than the hydrogen to better match final post-stretch star diameters but this isn't about star colors anyway... "Rick Johnson" wrote in message ... Judging by all the red stars it appears most stars don't have a deep absorption band for Sulfur compared to OIII or H alpha or is there some other reason most stars come through red. Is there a reason the H alpha is slightly narrower? Rick Richard Crisp wrote: Last night I switched lenses to the 300mm f/4 pentax smc 6x7 lens. this gives me about 6.19 arc-sec/pixel so I get a pretty big FOV of 5.28 x 3.52 degrees. This was the first time I have used this configuration. This is 3 x 20 minutes per filter and I used the Baader Planetarium [SII]/Ha/[OIII] filters for the image. Unfortunately I did not have a chance to shoot flats so I used one taken over a year ago with a different filter but the same optic. The shot isn't perfect, the focus could have been a bit sharper and it looks like I may want to adjust the lens tilt a smidge. It was really more of a test shot with a new setup. But I am happy with the performance of the Baader filters. This is the longest focal length I have used them so far and the 150mm length made it a bit difficult to really assess the color since the color detail is often quite small in many of these targets. This very familiar object is a real benchmark when it comes to color narrowband imaging of the summer sky: http://www.narrowbandimaging.com/ngc...2hao3_page.htm I plan to move the filters over to the AP180EDT f/9 in the coming month or so and try them on some smaller objects The value is superb: a fellow can do good narrowband for the price of RGB these days with these Baader filters.... |
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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e
Richard,
I like the version with the synthetic Hbeta. It's "funny" how good this method reproduces the colours that would be visible with an RGB image. I have noticed that on several images of planetary nebulae I took (although I only did a Ha:OIII:OIII combine). No need for RGB actually for emission nebulae, apart from star colours of course. Stefan "Richard Crisp" schrieb im Newsbeitrag et... thanks for the comment and for reminding me to do a synthetic Hbeta image: red = halpha green = [oiii] blue = [oiii] + synthetic hbeta synthetic hbeta = 30% * Halpha I added that image to the page below: http://www.narrowbandimaging.com/ngc...2hao3_page.htm "Stefan Lilge" wrote in message ... Richard, this certainly looks very good. I may try the "short" version (only Ha and OIII) on this one this year. Stefan "Richard Crisp" schrieb im Newsbeitrag . net... This is 3 x 20 minutes per filter and I used the Baader Planetarium [SII]/Ha/[OIII] filters for the image. Unfortunately I did not have a chance to shoot flats so I used one taken over a year ago with a different filter but the same optic. The shot isn't perfect, the focus could have been a bit sharper and it looks like I may want to adjust the lens tilt a smidge. It was really more of a test shot with a new setup. But I am happy with the performance of the Baader filters. This is the longest focal length I have used them so far and the 150mm length made it a bit difficult to really assess the color since the color detail is often quite small in many of these targets. This very familiar object is a real benchmark when it comes to color narrowband imaging of the summer sky: http://www.narrowbandimaging.com/ngc...2hao3_page.htm I plan to move the filters over to the AP180EDT f/9 in the coming month or so and try them on some smaller objects The value is superb: a fellow can do good narrowband for the price of RGB these days with these Baader filters.... |
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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e
"Stefan Lilge" wrote in message ... Richard, I like the version with the synthetic Hbeta. It's "funny" how good this method reproduces the colours that would be visible with an RGB image. I well that just proves my point that the emission lines that set the color of these nebulae are the Halpha, [OIII] and Hbeta all the others are very weak by comparison (ok there's some contribution from [SII], but not much) have noticed that on several images of planetary nebulae I took (although I only did a Ha:OIII:OIII combine). No need for RGB actually for emission nebulae, apart from star colours of course. yep a bit of broadband rgb to get the star colors right, massage the images to get the stars from the RGB to replace the emission line stars and you have it done! Stefan "Richard Crisp" schrieb im Newsbeitrag et... thanks for the comment and for reminding me to do a synthetic Hbeta image: red = halpha green = [oiii] blue = [oiii] + synthetic hbeta synthetic hbeta = 30% * Halpha I added that image to the page below: http://www.narrowbandimaging.com/ngc...2hao3_page.htm "Stefan Lilge" wrote in message ... Richard, this certainly looks very good. I may try the "short" version (only Ha and OIII) on this one this year. Stefan "Richard Crisp" schrieb im Newsbeitrag . net... This is 3 x 20 minutes per filter and I used the Baader Planetarium [SII]/Ha/[OIII] filters for the image. Unfortunately I did not have a chance to shoot flats so I used one taken over a year ago with a different filter but the same optic. The shot isn't perfect, the focus could have been a bit sharper and it looks like I may want to adjust the lens tilt a smidge. It was really more of a test shot with a new setup. But I am happy with the performance of the Baader filters. This is the longest focal length I have used them so far and the 150mm length made it a bit difficult to really assess the color since the color detail is often quite small in many of these targets. This very familiar object is a real benchmark when it comes to color narrowband imaging of the summer sky: http://www.narrowbandimaging.com/ngc...2hao3_page.htm I plan to move the filters over to the AP180EDT f/9 in the coming month or so and try them on some smaller objects The value is superb: a fellow can do good narrowband for the price of RGB these days with these Baader filters.... |
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