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Posts Made By: Larry Citro

April 7, 2003 12:21 AM Forum: CCD Imaging and Processing/Solar System

NGC 1763/69

Posted By Larry Citro
hi,

That's a spectacular image. For an extragalctular object with a small angular size, the resolution is amazing. Just great work !

clear skies,


Larry Citro

April 12, 2003 10:00 AM Forum: CCD Imaging and Processing/Solar System

M 101 lrgb image

Posted By Larry Citro
hi all,

Thanks for your comments.

Yes gradients are very hard to master,espicially if they are multidirectional. I bought the gradient removal plug in and that is helping a lot. I'm still on the learning curve with it ..but expect i'll will do better.

Now, if only i could move that ski resort and nearest city wink.


clear skies,

Larry Citro

April 12, 2003 04:24 PM Forum: CCD Imaging and Processing/Solar System

NGC6207 LRGB

Posted By Larry Citro
hi,

I think that's the galaxy every deep sky observer says is by m13 and try to look for it ... with up to 12" I could never find it.. Nice to see it for a change with very nice detail for such a small object.

0.6 arcsec/pixel is impressive .. good tracking and seeing

clear skies,

Larry Citro

April 13, 2003 03:30 AM Forum: CCD Imaging and Processing/Solar System

Clavius Large

Posted By Larry Citro
hi,

Really nice hires image !


clear skies,

Larry Citro

April 17, 2003 10:20 AM Forum: CCD Imaging and Processing/Solar System

M51 color

Posted By Larry Citro
hi,

Real nice picture for hanging out in the library (with some coffee, good company and conversation I take it ) ... isn't this a GREAT HOBBY !

clear skies,

Larry Citro

April 21, 2003 02:43 AM Forum: Equipment Talk

4-inch to 8-inch: Not Enough?

Posted By Larry Citro
hi,

i have both and the 8" wins on DSOs hands down. It has 4x the light gathering capacity and a smaller airy disk then the 4 and it shows.

I also have a 10 and a 12 1/2" and the next really noticable step past the 8 is the 12 1/2.

A 8" F6 well made dob with a premium mirror will run circles around a 4" anything on DSOs.

My advice ... bring you 4" to a star party and set it up next to someone with a 8" and look see.


clear skies,

Larry Citro





April 21, 2003 02:51 AM Forum: Equipment Talk

TeleVue 102/which mount to buy

Posted By Larry Citro
hi,

i have a Televue Genesis SDF on a Losmandy G8 (non goto) and it works well for visual and ccd imaging. I have no experience with the Vixen..but have read that it also is a very good mount for a 4" scope both visually and for ccd imaging.

If I was going to spend that much for a G8 .. I would consider getting a G11 for the additional fractional increase in cost. It's a mount you can grow with if you ever want to get a larger OTA.

clear skies,


Larry Citro

April 22, 2003 01:48 PM Forum: CCD Imaging and Processing/Solar System

M63 test image

Posted By Larry Citro
hi,

An amazing shot for only 15 mins exposure. The combined effect of dark skies and the high QE of the ST10XME is telling.

A question I've wondered about ... if two identical imaging set ups are used one in mag 4 skies and one in mag 6 skies, how much longer does the one in mag 4 skies have to image to reach the same S/N ratio as the one in mag 6 skies ?

I think in the mag 6 skies a mag 4 star will appear 2.5 x 2.5 times brighter then a mag 4 star in the mag 4 skies. I would guess this is due to the background noise (light pollution ) in the mag 4 skies is 6.25 times higher. If the relation ship is linear it would imply you have to image 6 times longer. But I doubt there is any lineraity in the reall world.

clear skies,


Larry Citro


April 29, 2003 08:21 PM Forum: CCD Imaging and Processing/Solar System

M100 LRGB with ST-10XME

Posted By Larry Citro
hi,

One of the nicest images of m100 I've seen. It seems to have sharper detail than the ngc3628 ypu posted a few links ago. The seeing must have improved.

Once you walk into that Virgo cluster..it can be a long time before you come out. A lot of nice targets there.

clear skies,,

Larry Citro

April 29, 2003 08:29 PM Forum: CCD Imaging and Processing/Solar System

NGC5364

Posted By Larry Citro
hi,

That is a nice galaxy.. you're right it would make a nice wide field shot ( film or st 10 on a short FL system ). In Uranometria 2000 I can count 15 galaxies in a 2 square degree field.


clear skies,


Larry Citro

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