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Posts Made By: Yu Gu

June 8, 2004 12:10 PM Forum: CCD Imaging and Processing/Solar System

Venus Transit from West Virginia

Posted By Yu Gu
Hello, Just had a clear morning grin
Here is my version of transit, and I still have 300 more to process smile

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

June 15, 2004 07:01 PM Forum: Telescope Making

The scope I am working on

Posted By Yu Gu
Hello,

I am currently working on a 16" F6.9 Newtonian for planetary observation. I just created a webpage for the project:

http://planets.lamost.org/EEquipments_16ATM.htm

Your suggestions and comments are appreciated.

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

June 13, 2006 05:21 PM Forum: CCD Imaging and Processing/Solar System

Jupiter with 114mm Newtonian

Posted By Yu Gu
Hello,

Just took this image last night. It was taken with a 114mm F9 Newtonian I bought of AM a few days ago for $45. I saw a lot of people using firewire cameras or LU075 etc. What would be the advantage of those camera compared to a B&W Modified ToUcam? And how much the improvement will be? Can anybody help me on that? I am trying to get back to plentary imaging after two years of idleing...

Thanks and Clear Skies,
GY

June 18, 2006 03:52 PM Forum: Equipment Talk

Star Testing Masters, help me understand this...

Posted By Yu Gu
Hello, I took some inside and outside focus shot yesterday with ToUcam. Each images were an stack of about 200 frames. No additional processing was applied except brightness adjustment. Can you help me evaluate the optics?

Thanks,
GY
http://planets.lamost.org

June 18, 2006 05:48 PM Forum: CCD Imaging and Processing/Solar System

Jupiter June 16th 2006 with 114mm Newtonian

Posted By Yu Gu
Hello,

Here is a Jupiter from June 16th 2006 with the 114mm F8 Newtonian, 3x barlow and ToUcam.

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

June 13, 2007 01:54 AM Forum: Refractors

Please help me star test this scope

Posted By Yu Gu
Hello Group,

I did a star test for my refractor yesterday with a ToUcam. The ones on the top are with a green filter and the ones below are without any filter. Each image is a average of approx. 150 frames. No additional processing was applied to the image. Now, I really need your experts' comments on the optical quality of this scope 8)

Clear Skies,
Gu

May 7, 2009 09:12 PM Forum: Equipment Talk

Just how much magnification is equal to 1X?

Posted By Yu Gu
When I was a kid, I liked to play with numbers. I knew Jupiter could sometimes be larger than 45”, so I was thinking, if someday I have a 100X telescope, Jupiter would look like 45”x100=75’. Holy Cow, that’s two and half times the diameter of the moon, and 6.25 times the area! That must be huge with lots of details. But I was disappointed, when I finally had a scope; the Jupiter looks like a pea, a small pea.

This happened to several of my (non-astro) friends as well. When I showed them the moon at 30X, they didn’t believe the moon was magnified. They thought it’s just clearer in the telescope, but not larger.

So, anybody had similar experience?

Clear Skies,
Gu 8)

September 22, 2009 05:06 PM Forum: CCD Imaging and Processing/Deep Sky

Field Flattener Recommendation for a TMB 115 F7?

Posted By Yu Gu
Hello! I am trying to configure my TMB 115 LW for Imaging. I was wonder if anyone can suggest a field flattener that works well with this scope? Since it's a LW version so only 2" accessory can be used.

I've been seeing some flattener claims to work with F6-F8 scopes. But my understanding is that the field curvature for a triplet refractor is roughly 1/3 of it's focal length. So how can a reducer be designed for a specific focal ratio not focal length? can somebody explain this for me?

Thanks!
Gu

May 24, 2002 02:08 PM Forum: Equipment Talk

New Lunar Shots

Posted By Yu Gu
The seeing was just normal (3-4/10) I have to stack many pictures to get a good one. The C9.25 is really a great scope.

May 25, 2002 07:35 PM Forum: Equipment Talk

New Lunar Shots

Posted By Yu Gu
Just updated my astrophotography website, including the latest lunar and Jupiter shots. Please stop by and leave your comments:
http://www.gyastro.homestead.com/astrophotography.html

Thanks,
GY

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