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  #81  
Old 07-05-2008, 05:46 PM
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Matty P (Matt)
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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.
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  #82  
Old 08-05-2008, 12:50 AM
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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.
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  #83  
Old 15-05-2008, 02:01 AM
Arp
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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?
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  #84  
Old 15-05-2008, 04:07 AM
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iceman (Mike)
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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.
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  #85  
Old 15-05-2008, 04:11 AM
Arp
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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.
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  #86  
Old 15-05-2008, 04:07 PM
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Great image Arp, you have done a great job.

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

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  #87  
Old 15-05-2008, 05:57 PM
Arp
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I used Deep Sky Stacker to stack the images, and then Fitswork zu sharpen it a bit.
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  #88  
Old 16-05-2008, 04:58 AM
Arp
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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?
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  #89  
Old 16-05-2008, 05:00 AM
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iceman (Mike)
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"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.
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  #90  
Old 16-05-2008, 05:10 AM
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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
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  #91  
Old 16-05-2008, 05:49 AM
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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)
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  #92  
Old 19-05-2008, 10:15 PM
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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
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  #93  
Old 25-10-2010, 12:35 PM
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If you remove the IR cut filter in the DFK21 is is then not the same as the DBK or are they ore differences ??
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