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Posts Made By: Yu Gu

May 23, 2002 09:52 PM Forum: Equipment Talk

New Lunar Shots

Posted By Yu Gu
Got a few clear nights and was able to get some good shots.
C9.25 SCT + 2x barlow + Philips Vesta Pro webcam.

Processed with Registax and Photoshop.

Wish you will like it.
Clear skies,
GY

June 4, 2002 06:59 PM Forum: Equipment Talk

Eyepiece for Pentax PF80ED

Posted By Yu Gu
Hi, I have a Pentax PF80Ed scope, It can accept standard 1.25" eyepiece but not all the eyepiece can come into focus.

My UO18mm ortho, 32mm PL works, but UO5,7mm ortho and TV3x barlow won't. I am thinking to buy a 16mm Nagler T5 or 14mmUWA but not sure if they will work on this scope. Does anybody have any experience on it?

Thanks,
GY

June 19, 2002 08:14 PM Forum: Equipment Talk

Unscrew the bottom of the 14mm Meade UWA

Posted By Yu Gu
I nnscrewed the bottom part(the barlow lens) of the 14mm UWA last night. It became a 2inch only eyepiece. The focal lens changed to near 30mm and the field of view was still huge. The eye relief became a lot more tight and the distortion at the edge was pretty bad. But it still works as a pretty good low power wide angle eyepiece. Anybody tried this before?

GY

June 28, 2002 06:04 PM Forum: Equipment Talk

How good is TV85's color correction?

Posted By Yu Gu
I have a Pentax PF80ED 80mm ED scope. I like to upgrade it to a TV85 but I want to know how good is TV85's color correction. My PF80ED is color free at low power and can see some purple at high power, but when compared with a good 90mm F11 achromatic, it's still 2-3 times better. How good can a TV85 be? compare to the 85mm achromatic, will it equails to a F20, F30.... or a F100 scope?

Thanks,
GY

June 29, 2002 12:16 AM Forum: Film Astrophotography - Imaging and Processing

Full Moon

Posted By Yu Gu
Took with C9.25 SCT + 32mm Plossl eyepiece + Nikon 950 Digital Camera at 1/60 sec.

11 pictures mosaic, proccessed in photoshop

July 23, 2002 03:33 PM Forum: Film Astrophotography - Imaging and Processing

Sunspots

Posted By Yu Gu
Took with Baddar filter + Mergez 80 + Nikon 950
Processed with Registax and Photoshop

September 7, 2002 01:38 PM Forum: Film Astrophotography - Imaging and Processing

First Saturn this Year!

Posted By Yu Gu
Took this morning, C9.25 +2x + Philips Toucam.

Wish you will like it.

September 27, 2002 05:34 PM Forum: Equipment Talk

A question to Experts

Posted By Yu Gu
Hi, I just got a Canon FD300mm F2.8 Lens. The optics of this lens is shown here: The first element is a protective glass, the 2nd element is a fluorite and the 3rd is a UD glass.

My question is:
can I just take the first 4 elements(with the lens cell) out and make a telescope from it? Will the SA and CA very high without the other elements? What will be the focal length of it?(longer or shorter than 300mm?)

Thanks,
GY

October 1, 2002 07:31 PM Forum: CCD Imaging and Processing/Solar System

Jupiter and Saturn

Posted By Yu Gu
Took this morning. The sky was quite steady (4-5/10)
Equipments are : C9.25 + 2X + Philips ToUCam

Clear Skies,
Yu Gu
www.gu_yu.homestead.com

October 22, 2002 01:28 PM Forum: CCD Imaging and Processing/Solar System

Everybody like Saturn!

Posted By Yu Gu
Took this morning with my C9.25 and toUcam. Seeing was quite good (5-6/10)!

Clear skies,
GY
www.gyastro.homestead.com


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