Go Back   IceInSpace > Equipment > Astrophotography and Imaging Equipment and Discussions

Reply
 
Thread Tools Rating: Thread Rating: 3 votes, 5.00 average.
  #81  
Old 07-05-2008, 06:46 PM
Matty P's Avatar
Matty P (Matt)
Star Struck

Matty P is offline
 
Join Date: Nov 2007
Location: Canberra
Posts: 2,797
Hi Alberto and welcome,

There is a significant difference between the two. Monochrome vs OSC, the Monochrome camera will always come out on top.

I've seen both DMK and DBK images side by side and the DMK images easily had the most depth and detail. I'm not saying that OSC wont produce great results but when comparing the two the Mono camera is superior.

I agree with Mike, you should look into getting some RGB filters to use with your DMK31.

My 2 cents...



P.S. Your test images are amazing, well done.
Reply With Quote
  #82  
Old 08-05-2008, 01:50 AM
richter56's Avatar
richter56
Lazy A.A.

richter56 is offline
 
Join Date: May 2008
Location: italy
Posts: 3
DMK and surrounding

Hi Iceman and Matty,
thx for your kind words.
I visited your nice galleries too.
Yes i know that the DMK is superior mainly for the absence of the Bayer mask of course.
That means almost double sensitivity and nearly double definition...and that is really important!

I'm lazy and since i began with a Toucam Pro i remember how easy it was to do color. Direct color always fascinated me LOL...
My first attempts to RGB with DMK are pretty bad and i placed a bookmark on the article about making RGB images that i found here in Icespace. I'll study it carefully.
I have a little ATIK filter-wheel and a set of Baader R G B + IR.
I know that they are entry level filters but i guess that if those filters are used by a RGB expert he could get decent results. Isn't it?

Any suggestion i well accepted...

Thx and regards
Alberto

PS: unfortunately i must forget jupiter for one year or two...
Currently it raise to 20 or so.
Very difficult to do decent images.
Reply With Quote
  #83  
Old 15-05-2008, 03:01 AM
Arp
Registered User

Arp is offline
 
Join Date: Mar 2008
Location: Burscheid, Germany
Posts: 17
HI there!
I got my DMK and as I promised, I finally used it to get a guidingstar and captured M51.
Here as promised
http://www.astrob.org/IMG/M51_2.jpg

One question though... If I use the Powermate 5x, do the multiple RGB Channels have different focus points, or is the Powermate achromatic?
Reply With Quote
  #84  
Old 15-05-2008, 05:07 AM
iceman's Avatar
iceman (Mike)
Sir Post a Lot!

iceman is offline
 
Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,709
Wow Arp, that is really, really good!
What scope did you use? Exposure times?

The powermate is the best of the barlows, but it still can require a slightly different focal point in each colour channel. It's not necessarily the powermate that causes it though - it's more likely the atmospheric dispertion. I've found it also depends on the seeing and the altitude.
Reply With Quote
  #85  
Old 15-05-2008, 05:11 AM
Arp
Registered User

Arp is offline
 
Join Date: Mar 2008
Location: Burscheid, Germany
Posts: 17
thx
That was a 8" Newtonian at 1200mm focal length. It was exposed 24x 180s, making a total of about 74 minutes at ISO 800 with a modified EOS 350D and as said the DMK21 on a 90mm refractor as guider.
Reply With Quote
  #86  
Old 15-05-2008, 05:07 PM
Matty P's Avatar
Matty P (Matt)
Star Struck

Matty P is offline
 
Join Date: Nov 2007
Location: Canberra
Posts: 2,797
Great image Arp, you have done a great job.

What kind of processing software did you use for this image?

Reply With Quote
  #87  
Old 15-05-2008, 06:57 PM
Arp
Registered User

Arp is offline
 
Join Date: Mar 2008
Location: Burscheid, Germany
Posts: 17
I used Deep Sky Stacker to stack the images, and then Fitswork zu sharpen it a bit.
Reply With Quote
  #88  
Old 16-05-2008, 05:58 AM
Arp
Registered User

Arp is offline
 
Join Date: Mar 2008
Location: Burscheid, Germany
Posts: 17
hi there.
Im experimenting with rgb images. I read your guide iceman, but how would I align the rgb channels, if I wouldnt use AstralImage? Any way in registax or fitswork, or something else that comes as freeware?
Reply With Quote
  #89  
Old 16-05-2008, 06:00 AM
iceman's Avatar
iceman (Mike)
Sir Post a Lot!

iceman is offline
 
Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,709
"GIMP" is freeware. Do you have photoshop?

Registax can't combine separate RGB channels into an RGB image.

You can use the trial version of AstraImage and then take a screenshot - I know that's what some people do.
Reply With Quote
  #90  
Old 16-05-2008, 06:10 AM
Arp
Registered User

Arp is offline
 
Join Date: Mar 2008
Location: Burscheid, Germany
Posts: 17
Im not talking about the actual recombining, but the position. My Saturn has in all 4 channels (using L too) a different position, so at first I need to get them aligned so that recombination doesnt end up in some wierd image
Reply With Quote
  #91  
Old 16-05-2008, 06:49 AM
iceman's Avatar
iceman (Mike)
Sir Post a Lot!

iceman is offline
 
Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,709
Try gimp - it will let you shift the colour channels to re-align them. Or, once you have a recombined RGB image, you could try registax with the "estimate RGB" function on the wavelets page.

Or, photoshop.

Or, AstraImage as above - when you recombine the image you can adjust the X/Y offset of each channel.

For combining LRGB, the only programs I would use are GIMP and Photoshop but I know there are others (probably MaximDL and other deep-space image processing software)
Reply With Quote
  #92  
Old 19-05-2008, 11:15 PM
netwolf's Avatar
netwolf
Registered User

netwolf is offline
 
Join Date: Jan 2005
Posts: 2,902
Arp, Steller Magic was one I found that could do RGB recombining. But I could not work out how to do the Offsets that Mike discusses in his article.
Also when you say Saturn is in diffrent position do you mean that your camera has rotated? Or that it is not in the centre of the frame? If frame centre then PPMCentre could do this for you. Mike mentions this in his article
http://www.iceinspace.com.au/index.p...63,306,0,0,1,0

Regards
Fahim
Reply With Quote
  #93  
Old 25-10-2010, 01:35 PM
Frewi808's Avatar
Frewi808 (Freddy)
Registered User

Frewi808 is offline
 
Join Date: May 2009
Location: Hawaii, Waipahu
Posts: 203
If you remove the IR cut filter in the DFK21 is is then not the same as the DBK or are they ore differences ??
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 03:07 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Meade Australia
Advertisement
SkyWatcher Australia
Advertisement
Bintel
Advertisement
NexDome Observatories
Advertisement
Celestron Australia
Advertisement
Lunatico Astronomical
Advertisement
OzScopes Authorised Dealer
Advertisement
Astronomy and Electronics Centre
Advertisement