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Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Alan Friedman

April 27, 2005 03:11 AM Forum: CCD Imaging and Processing/Solar System

Jupiter 4/26 C11 on a perfect night!

Posted By Alan Friedman
Chris -

Lots of detail to be seen in this image in the EZ also...

nice work!
Alan

April 27, 2005 03:23 AM Forum: CCD Imaging and Processing/Solar System

Copernicus from 4/19

Posted By Alan Friedman
... and a little bit closer now with a 2x powermate (the seeing should have told me to keep the barlow in the box!).

cheers -
Alan

April 27, 2005 06:11 PM Forum: CCD Imaging and Processing/Solar System

my best Jupiter

Posted By Alan Friedman
Hi Mauricio -

Keep at it!

One of the beautiful things about planetary imaging is that you can do it anywhere - even from mid-town Manhattan (although I think French Polynesia has an edge for Jupiter.) smile

Alan

April 27, 2005 06:21 PM Forum: CCD Imaging and Processing/Solar System

Copernicus from 4/19

Posted By Alan Friedman
Thanks guys, for your generous comments.
Compared to planets, lunar imaging really has its own set of challenges!

I should mention that I used the red filtration technique (SBIG filters with IR blocking) for these shots. I would estimate the seeing at the eyepiece was 5/10 but it improved noticeably when the red filter was applied.

cheers-
Alan

April 29, 2005 02:41 PM Forum: CCD Imaging and Processing/Solar System

Hires Rupes Recta "Straight Wall"

Posted By Alan Friedman
Wes -

This deep and detailed view shows a familiar feature in a different light.

Fascinating -

Alan


April 29, 2005 05:34 PM Forum: CCD Imaging and Processing/Solar System

Schiller--exercise in image scale

Posted By Alan Friedman
Hi Mike -

Nice comparison. I think when when imaging the moon with a large scope increasing the effective focal length will produce a higher resolution image. You will probably always reach a limit defined by the seeing before you are limited by aperture. Prettier pictures might be made at a shorter focal length - but the higher magnification view will reveal finer features.

Seems things are a little more complicated on the planets and their low contrast details. Here there may be a sweet spot at a shorter focal length than would be optimum for the moon. It may be my inexperience with very fine seeing conditions, but I seem to get as good or better results from my 10" mak at f28-30 than f40-45.

Alan

April 29, 2005 09:17 PM Forum: CCD Imaging and Processing/Solar System

lunar landscape - help!

Posted By Alan Friedman
Thanks for the comments and directions!

I made this version with titles so I wouldn't lose my way again.

best -
Alan

May 1, 2005 01:45 AM Forum: CCD Imaging and Processing/Solar System

AR756 (Sunspot image)

Posted By Alan Friedman
Paul - Excellent!

I am hoping the sun will cooperate and give me a peek at this spot -

Alan

May 3, 2005 02:27 PM Forum: CCD Imaging and Processing/Solar System

AR 756 in White light (May 1)

Posted By Alan Friedman
Hi Paul -

Excellent result on a very hard subject!

Alan

May 3, 2005 04:39 PM Forum: CCD Imaging and Processing/Solar System

AR 756 in White light (May 1)

Posted By Alan Friedman
Hi Paul -

This is an image I took Sunday afternoon using a 130mm Baader filter on a 155mm f7 refractor. It is very similar to your image. I tried a bunch of different filters in front of the webcam that day - green, IR pass, H-Alpha... This one - a 48mm bandpass centered on H-Alpha produced the sharpest result.

Some wonderful images have been posted around, all using the Baader Hershel wedge for white light imaging. I am tempted to try one of these. Have you?

best -
Alan

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