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Posts Made By: Yu Gu

September 8, 2002 02:23 PM Forum: Film Astrophotography - Imaging and Processing

First Saturn this Year!

Posted By Yu Gu
Another saturn took this morning.
For more astro pictures, please visit my website:
www.gu_yu.homestead.com

GY

April 7, 2003 08:27 PM Forum: Telescope Making

16" ATM project done! The results:

Posted By Yu Gu
Now it's the time to start your next ATM job:
16" cloud filter..

April 8, 2003 01:06 PM Forum: CCD Imaging and Processing/Solar System

Re: 22923 last night pics done

Posted By Yu Gu
But my picture certainly have a Copyright © on it:
http://www.astromart.com/messages.asp?message_id=60796&page=

And you just simply removed it:
http://www.astromart.com/messages.asp?message_id=61444&page=

Regards,
GY

June 1, 2003 08:10 PM Forum: CCD Imaging and Processing/Solar System

AR365

Posted By Yu Gu
AR373 shown noticeable changes in 24 minutes!

Clear skies,
GY
http://planets.lamost.org

June 28, 2003 05:03 PM Forum: CCD Imaging and Processing/Solar System

Dragon on the sun!

Posted By Yu Gu
or maybe this version?
smile

August 22, 2003 04:55 AM Forum: CCD Imaging and Processing/Solar System

Mars Aug.21st 2003 Reprocessed (1)

Posted By Yu Gu
2:

August 24, 2003 11:16 PM Forum: CCD Imaging and Processing/Solar System

Which one do you like better? or neither?

Posted By Yu Gu
To fight against the bad seeing condtion and atomsphere dispersion (From my location mars only reachs 33 degrees above horizon) I was using color filters to get different channels.

My setup is C9.25 + 3X barlow + homemade filter changer + Astronomik filters(Thanks Mr.Sean Walkersmile + ToUcam

Normally I only use Red and Blue filters. The green channel is the average of Red and Blue(according to the S&T article). I found the seeing is always more stable for blue light than the red light (can anybody explane this?) But mars won't give enough blue light to get a good signal noise ratio.

I align all the frames in Registax 2.0 but stack and process them with registax 1.1(which I feel is better for some reason). The finally RGB assembling and adjustment was done in Photoshop.

Attached are the typical selected Red and Blue channel raw frames.

clear skies,
GY
http://planets.lamost.org/

August 25, 2003 11:57 PM Forum: CCD Imaging and Processing/Solar System

mars image 24th August 2003

Posted By Yu Gu
Hi, Wei Leong

Congratulations! That's the best amature Mars I've ever seen! BTW, I like the first one better.

Thanks for sharing,
GY

August 26, 2003 12:07 AM Forum: CCD Imaging and Processing/Solar System

Which one do you like better? or neither?

Posted By Yu Gu
Hi,

Thanks everybody for the comments. Seems most people think the first one is better because it shows more detail. Actually I like the second one better personally. And I even think the second one is a little overprocessed for my taste. But the problem is the contrast. If I don't process harder the contrast would be too low so the detail won't pop up too well. I think it possibly have something to do with my C9.25's CO and the atomsphere's diturbance. Because throgh my TV102 mars is always contrasty.

But in the other hand if you compare the two image closely the detail in the right one is always "smaller" than the left one which shown the right one actually might have better resolution. This is because the right one lack of high radius sharpening which could wash out the fine detail. It's really a headache to balace the contrast and detail.

Clear skies,
GY
http://planets.lamost.org

September 6, 2003 04:02 PM Forum: Telescope Making

My new scope :)

Posted By Yu Gu
here is another pic.

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