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Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Jake Jacobson

December 19, 2003 07:09 PM Forum: Equipment Talk

Sources for Pentax XL eyepieces

Posted By Jake Jacobson
Eddie -

I don't think anyone has them anymore. I looked for months for the 10.5, and could not find it. I finally ordered the 10mm XW, and am really glad I did. It has all the same characteristics of the 10.5, with an even wider fov. If you like the XL, you will love the XW.

-Jake

January 9, 2004 09:34 AM Forum: CCD Imaging and Processing/Solar System

Another Rebel Moon

Posted By Jake Jacobson
Beautiful!


January 12, 2004 01:12 AM Forum: Equipment Talk

Pentax XW's

Posted By Jake Jacobson
Hi Jason -

I have the 10mm XW and it is an excellent eyepiece. It is sharp to the edge in my 8" f/5, and has very good transmission and contrast.

-Jake

January 15, 2004 01:45 AM Forum: CCD Imaging and Processing/Solar System

Saturn 1/12/04

Posted By Jake Jacobson
Paul -

Very nice image. It looks like you have some processing artifacts on the globe on both images. You might want to run the stack through alignment again - I bet it would clean up your image and make it even sharper.

-Jake

January 21, 2004 08:11 PM Forum: CCD Imaging and Processing/Solar System

Help with Saturn Image

Posted By Jake Jacobson
Hi Joe -

It looks like you might be stacking frames with too much turbulance showing in them, causing the smears in the image. Maybe try selecting only the frames where the atmosphere is the most steady, and only stacking those frames. My experience is that only 40 clear frames will give you a better image than 400 not so clear ones.

As for the gain, I wouldn't put it any higher - it looks like your final image is plenty bright enough. Upping the gain will only destroy details in your image. The ultimate goal is to use the clearest raw frames possible.

Hope that helps,

-Jake

January 22, 2004 07:14 AM Forum: Equipment Talk

Who Made the CI-700 Mount for Celestron?

Posted By Jake Jacobson
Hi Rob -

The CI-700 was not made by Losmandy, it was made by Celestron. Celestron used to use Losmandy G-11 mounts, but then started making the cheaper CI-700 mount to replace it. The CI-700 is not nearly as good a mount as the G-11, especially in terms of tracking and PE. It is, however, just as stable, and makes a good mount for visual use.

Hope that helps,

-Jake

January 22, 2004 10:14 PM Forum: CCD Imaging and Processing/Solar System

Anyone with a Digital Rebel-help needed.

Posted By Jake Jacobson
Hi Ivan -

I recently did a 5 minute exposure at ISO800, and got only about 3-5 hot pixels. At the same time, I was imaging outside in about 30deg temperature.

Hot temperature will increase your # of hot pixels.

-Jake

January 25, 2004 04:51 AM Forum: CCD Imaging and Processing/Solar System

NGC 891

Posted By Jake Jacobson
That's a beauty!

-Jake

January 27, 2004 05:37 PM Forum: CCD Imaging and Processing/Solar System

N 253

Posted By Jake Jacobson
Mark -

That's a real beauty!

-Jake

January 27, 2004 07:38 PM Forum: CCD Imaging and Processing/Solar System

Saturn 01/26/04

Posted By Jake Jacobson
"Didn't think seeing was all that great, but I guess it fooled me."

I guess so! That is remarkably sharp, the seeing must have been good.

Excellent job at processing also, the detail is very good, yet it does not have an "overprocessed" look at all.

Very good work!

-Jake

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