RE: [MaxImDL] Re: Processing Images taken in Light Polluted skies


Sep 9, 2007

 


----------------------------

#29473 Sep 9, 2007

I am looking for a little help and guidance in taking and processing

some of my images using Maxim DL. I am in a city of 60,000 and am

using a 12" RCX400 scope with a hutech LPR filter. I seem to be

getting quite a bit of sky glow showing up on my images. I have an

outside security camera with an IR light that illuminates my backyard.

Should I turn this off when imaging? I guess that is kind of a dumb

question since CCD cameras are sensitive to IR. If anyone could point

me in the right direction as to how to image and process under urban

light polluted skies, I would be grateful. I mainly image galaxies and

nebula.



Thanks



Steve



----------------------------

#29522 Sep 13, 2007

How about some help with my question please... I am a beginner Maxim

user and was hoping someone would take a minute to help me get up to

speed processing images taken under light polluted skies. I know

there are techniques you can use but since I am new, I really don't

know them. Any help would be greatly appreciated.



Thanks



Steve Tuma



--- In MaxImDL@yahoogroups.com, "stuma2001" stuma@...> wrote:

>

> I am looking for a little help and guidance in taking and

processing

> some of my images using Maxim DL. I am in a city of 60,000 and am

> using a 12" RCX400 scope with a hutech LPR filter. I seem to be

> getting quite a bit of sky glow showing up on my images. I have an

> outside security camera with an IR light that illuminates my

backyard.

> Should I turn this off when imaging? I guess that is kind of a dumb

> question since CCD cameras are sensitive to IR. If anyone could

point

> me in the right direction as to how to image and process under

urban

> light polluted skies, I would be grateful. I mainly image galaxies

and

> nebula.

>

> Thanks

>

> Steve

>



----------------------------

#29525 Sep 13, 2007

Hi Steve,



I live the San Francisco Bay Area. A city of 60000 sounds like dark skies to me :-)



I use the IDAS LPS filter to image with. The color balance is reasonable, but I can still get gradients. I use a different bag of tricks depending on the severity, and some areas of the sky are just off limits to me.



I got Russ Corman.s Gradent exterminator for Photoshop. MaximDL has a reasonable function to correct for gradients as well. PixInsight has a background subtraction that will work. All these end up being trial and error to gain experience. I have not found one solution that works every time.



If you.re new to astrophotography, I would recommend some reading material: Ron Wodaski.s books are a good resource, and I find Adam Block.s DVD.s very helpful at getting the learning curve jump started.



What camera are you using? I find the gradients are more of an issue with the wider views I get with a DSLR.



I find the H-Alpha imaging doesn.t need a light pollution filter. I would imagine the same is true for other narrow band filters.



Does the LPS filter you use include UV & IR blocking? That would help, but turning off the IR source can.t hurt.



Audie







----- Original Message ----

From: stuma2001 stuma@...>

To: MaxImDL@yahoogroups.com

Sent: Thursday, September 13, 2007 7:45:06 PM

Subject: [MaxImDL] Re: Processing Images taken in Light Polluted skies



How about some help with my question please... I am a beginner Maxim

user and was hoping someone would take a minute to help me get up to

speed processing images taken under light polluted skies. I know

there are techniques you can use but since I am new, I really don't

know them. Any help would be greatly appreciated.



Thanks



Steve Tuma

--- In MaxImDL@yahoogroups .com, "stuma2001" stuma@...> wrote:

>

> I am looking for a little help and guidance in taking and

processing

> some of my images using Maxim DL. I am in a city of 60,000 and am

> using a 12" RCX400 scope with a hutech LPR filter. I seem to be

> getting quite a bit of sky glow showing up on my images. I have an

> outside security camera with an IR light that illuminates my

backyard.

> Should I turn this off when imaging? I guess that is kind of a dumb

> question since CCD cameras are sensitive to IR. If anyone could

point

> me in the right direction as to how to image and process under

urban

> light polluted skies, I would be grateful. I mainly image galaxies

and

> nebula.

>

> Thanks

>

> Steve

>











---------------

Check out the hottest 2008 models today at Yahoo! Autos.

autos.yahoo.com/new_cars.html



[Non-text portions of this message have been removed]



----------------------------

#29527 Sep 13, 2007

Hi Steve:

The lack of response to your question is probably because you're asking such

a broad question that people don't know where to start answering. Assuming

you've already read the Maxim manual carefully, I recommend that you get

both of Ron Wodaski's books if you haven't already. These provide the broad

base of information you're asking about. And you can see that since I'm

suggesting two full books, that it would not be practical to try to provide

that broad base by email suggestions.

Beyond those books, my other suggestion is that you simply plunge in (with

Maxim manual in hand), connect everything up, and start collecting images.

As with so many skills, hands-on practice is essential to learning. If you

have a local club or anyone in your vicinity who does CCD imaging, spending

a couple of sessions with them would be invaluable.

Once you're confident with the essentials of getting frames downloaded from

the camera and combined in Maxim, you'll be able to ask much more specific

(and answerable) questions of this group. I think you'll find that there are

a lot of people willing to provide lots of suggestions regarding specific

images that you post and you'll get lots of useful comments.

Bottom line: it's quite easy now to get images, given the excellent hardware

and software available. (Getting superb images is another matter entirely,

but that's not where you and I are at BG>).

Hope this helps a little...

Bert



katzung1@...

www.astronomy-images.com

www.visionlightgallery.com/katzung/

----- Original Message -----

From: "stuma2001" stuma@...>

To: MaxImDL@yahoogroups.com>

Sent: Thursday, September 13, 2007 7:45 PM

Subject: [MaxImDL] Re: Processing Images taken in Light Polluted skies





> How about some help with my question please... I am a beginner Maxim

> user and was hoping someone would take a minute to help me get up to

> speed processing images taken under light polluted skies. I know

> there are techniques you can use but since I am new, I really don't

> know them. Any help would be greatly appreciated.

>

> Thanks

>

> Steve Tuma

>

>

> --- In MaxImDL@yahoogroups.com, "stuma2001" stuma@...> wrote:

>>

>> I am looking for a little help and guidance in taking and

> processing

>> some of my images using Maxim DL. I am in a city of 60,000 and am

>> using a 12" RCX400 scope with a hutech LPR filter. I seem to be

>> getting quite a bit of sky glow showing up on my images. I have an

>> outside security camera with an IR light that illuminates my

> backyard.

>> Should I turn this off when imaging? I guess that is kind of a dumb

>> question since CCD cameras are sensitive to IR. If anyone could

> point

>> me in the right direction as to how to image and process under

> urban

>> light polluted skies, I would be grateful. I mainly image galaxies

> and

>> nebula.

>>

>> Thanks

>>

>> Steve

>>

>

>

>

>

>

> Yahoo! Groups Links

>

>

>

>







----------------------------

#29528 Sep 13, 2007

Steve,



The quickest way to get up to speed are the Adam Block videos.



www.caelumobservatory.com/video/dvd.shtml



HTH,







Terry

www.geocities.com/tlt284@.../terryshuntofthemonth/index.htm





_____



From: MaxImDL@yahoogroups.com [mailto:MaxImDL@yahoogroups.com] On Behalf Of

stuma2001

Sent: Thursday, September 13, 2007 9:45 PM

To: MaxImDL@yahoogroups.com

Subject: [MaxImDL] Re: Processing Images taken in Light Polluted skies







How about some help with my question please... I am a beginner Maxim

user and was hoping someone would take a minute to help me get up to

speed processing images taken under light polluted skies. I know

there are techniques you can use but since I am new, I really don't

know them. Any help would be greatly appreciated.



Thanks



Steve Tuma



--- In MaxImDL@yahoogroups mailto:MaxImDL%40yahoogroups.com> .com,

"stuma2001" stuma@...> wrote: >

> I am looking for a little help and guidance in taking and

processing > some of my images using Maxim DL. I am in a city of 60,000 and am

> using a 12" RCX400 scope with a hutech LPR filter. I seem to be

> getting quite a bit of sky glow showing up on my images. I have an

> outside security camera with an IR light that illuminates my

backyard. > Should I turn this off when imaging? I guess that is kind of a dumb

> question since CCD cameras are sensitive to IR. If anyone could

point > me in the right direction as to how to image and process under

urban > light polluted skies, I would be grateful. I mainly image galaxies

and > nebula.

>

> Thanks

>

> Steve

>











[Non-text portions of this message have been removed]



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