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Posts Made By: Tom Licha

November 25, 2002 08:58 AM Forum: Equipment Talk

Subjective Question

Posted By Tom Licha

Jerry,

I bet the 6 inch APO is much better and the 5 is still better. A 8 inch SCT (mass production) ist most probably not good collimated enough and not fully collimatable at all.

Like the other stargazers mentioned I agree that the even better *and* cheaper view will be a 10 or 12 inch Newtonian. It can be collimated easily, has only one active optical surface and in the center of view there are *no* aberrations at all! (Well, if the mirror is excellent...)

Gute Nacht
Tom
mehr freude. http://www.licha.de/AstroWeb 49° 13' 54" N

January 15, 2003 10:07 AM Forum: CCD Imaging and Processing/Solar System

Question about digital imaging software???

Posted By Tom Licha

Hi Chris,

while the M$ is too bad (IMHO) and Photoshop is an expensive overkill (IMHO) I would suggest using

Paint Shop Pro from JASC.

You can download it check it out for free. When you finally like it (and I am sure you will) you can pay a shareware fee.

CU
Tom

January 15, 2003 10:17 AM Forum: Film Astrophotography - Imaging and Processing

CCD fan WARNING et.al.,

Posted By Tom Licha

Larry,

you might want to research the fan producer Pabst. They are well-known for their extremely silent fans in the audio industry. The silence does come from the proper air flow and by a proper balance of the wings and precise bearings.

I have a 12 Volt one and it is *very* silent and without vibes.

CU
Tom

January 15, 2003 10:20 AM Forum: Film Astrophotography - Imaging and Processing

Preferred Digital Camera

Posted By Tom Licha

Hi,

for appr. $900 you could get the Minolta Dimage 7i. It has a darkframe subtraction to minimize noise in long exposures and a excellent lens.

CU
Tom

February 7, 2003 04:53 AM Forum: CCD Imaging and Processing/Solar System

LRGB?

Posted By Tom Licha

Hi Marty,

luminance is correct. That means a frame taken with no filter hence containing all the colors.

The idea behind it is to shoot a very good L frame. This frame later will be respnsible for sharpness and contrast.

The RGB frames then can be exposed much less or even at lower resolution.

February 7, 2003 04:59 AM Forum: CCD Imaging and Processing/Solar System

Tak fs-78 first light revisited...

Posted By Tom Licha

Hi Andrew,

thats a brillant first light. I really would like to include it into my gallery! It would reach a top ten position. A link back to your site and full copyright credits is guaranteed.

If you wish to do that please upload the full resolution it here:

http://www.licha.de/AstroWeb/send_content.php3?sCont=pix

You can check the gallery here:

http://www.licha.de/AstroWeb/gallery.php3?iCal=0

Thanx a lot
Tom

February 7, 2003 05:05 AM Forum: CCD Imaging and Processing/Solar System

Tutorial on inexpensive imaging

Posted By Tom Licha

Hi John,

if you already have an ordinary Digi Cam you can use that too!

Wes Higgins had brillant success with his Olympus 2100UZ.

About coupling it to the telescope check this (here are also included example pic of Wes. Just use "search")

http://www.licha.de/AstroWeb/articles_fullsize.php3?iHowTo=2

Good luck
Tom

February 7, 2003 05:12 AM Forum: CCD Imaging and Processing/Solar System

Help wanted

Posted By Tom Licha

Hi Maurice,

the best thing is to avoid recording the gradient! Because the CCD frame is so small compared to the 35mm film you can apply a lonmg extension tube made from cardboard in front of the lens.

The idea behind it is that 90% of that glow is not from the sky background nad the moon, but from the moon shining in some angle onto your front lens. This light though not directly reaching the CCD is scatterd. That scattering is reaching the CCD!

When the air is reasonable transparent you can have great results with no gradients. When the air is dewy then the extension tube will fail, because the light was already scatterd in the atmosphere.

If your lens has a reasonable multi-cotaing you should definitly give it a try.

Good luck
Tom

February 7, 2003 05:13 AM Forum: CCD Imaging and Processing/Solar System

Betelgeuse

Posted By Tom Licha

Hi,

where is the orange-red color of that red giant?

CU
Tom

May 15, 2003 09:30 AM Forum: CCD Imaging and Processing/Solar System

Question: Focal length calculation

Posted By Tom Licha

Hi,

check this formula:

http://www.licha.de/AstroWeb/articles_fullsize.php3?iHowTo=2

Hamp