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ASTRO: First light test 300mm pentax f/4 with baader narrowbands/img6303e



 
 
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  #1  
Old July 4th 07, 08:01 PM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
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Posts: 985
Default 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....




Attached Thumbnails
Click image for larger version

Name:	ngc7k_p300_6303_baader_s2hao3_9x20min_xga.jpg
Views:	274
Size:	332.5 KB
ID:	1004  
  #2  
Old July 4th 07, 08:06 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default 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....




  #3  
Old July 4th 07, 08:43 PM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
external usenet poster
 
Posts: 985
Default 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....








Attached Thumbnails
Click image for larger version

Name:	ngc7k_p300_6303_baader_hao3o3_6x20min_xga.jpg
Views:	175
Size:	307.2 KB
ID:	1005  
  #4  
Old July 4th 07, 08:43 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default 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....


  #5  
Old July 4th 07, 09:16 PM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
external usenet poster
 
Posts: 985
Default 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....




  #6  
Old July 4th 07, 10:51 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default 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....








  #7  
Old July 4th 07, 11:11 PM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
external usenet poster
 
Posts: 985
Default 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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