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First light DS SolarMaXii 60MM

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#1 Bob Moore

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Posted 14 November 2012 - 11:29 AM

Hi All, I'm still having issues with the set up but here is a short stacked image from today. the equipment is: Paramount, Solar Max II DS 60mm and a IS DFK 21. the set up should have a IS DFK 41AU02.as but i'm having issues getting focus with the camera

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#2 Jesus Munoz

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Posted 14 November 2012 - 12:07 PM

Hi Bob,

Are you having problems getting focus because the camera or because the focuser. I've heard that the focuser is very difficult to use.

#3 Bob Moore

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Posted 14 November 2012 - 12:20 PM

With so many things to adjust i just can't get an image with the 41 that comes close to what i'm getting with the 21, it could be that the my settings in the software are just off for the DFK41 i'm not sure but no matter what I try I just can't get it right.

#4 drksky

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Posted 14 November 2012 - 03:01 PM

I'm using a DMK51 with our SMII 90DS ad don't have any problems reaching focus. You just have to find the right amount to extend the tube extensions, then fine tune it with the helical.

On our 90DS, I put the helical about in the center of it's travel, then get a rough focus extending the first tube. For my, that's about 3/4 of the travel for the first tube. Then just fine tune it with the helical.

#5 Bob Moore

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Posted 14 November 2012 - 07:31 PM

Tony, what software are you using and what are your settings

Thanks
Bob

#6 drksky

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Posted 15 November 2012 - 06:02 AM

I'm using IC Capture that came with the camera, but truthfully, I don't remember the exact settings. I know I'm keeping the gain really low and adjusting the exposure with the shutter speed, which was arount 1/125 to 1/250th for the surface, longer for the limb (I'm terrible with taking notes). Here's my Astrobin page which has some recent examples.

When you say you're having trouble with focus, do you mean finding focus or achieving focues (i.e. the scope won't physically focus with the camera)? Is the image above a single frame, or stacked video from Registax? Wavelets applied?

I've been using this method of histogram focusing for all my solar work and find that it's very effective.

#7 drksky

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Posted 15 November 2012 - 06:03 AM

I see now that it's a stacked image. Did you apply any wavelets to it? From what I can see, the image is well-focused, but just needs some sharpening.

Ugh...nevermind. I see that one was taken with a DFK21 and you're having problems with a DFK41 (apparently I'm bad at reading, too).

Aren't the cameras physically the same size, save for the chip? I can't imagine why one would focus and one wouldn't.

#8 Bob Moore

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Posted 15 November 2012 - 11:01 AM

The size of the chip and the fact that the 21 is a monochrome and the 41 is a color camera

#9 drksky

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Posted 15 November 2012 - 11:08 AM

Neither of those should make a difference. Focus distance to the chip should be the same on all the IS cameras if the form-factor is the same.

#10 Jesus Munoz

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Posted 15 November 2012 - 11:26 AM

It's very strange that you can't get focus. Have you tried the DMK41 with other scope, maybe targeting the Moon?

Because of the size of your sensor I reccomend capturing in .SER using FireCapture software. It is very complete and easy to use.

#11 Bob Moore

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Posted 15 November 2012 - 04:41 PM

I don't think it's focus that I can't get, I just can't get an image that comes close to the detail I get with the color DFK 41 that I can with the DMK 21. By the way FireCapture works Very Very well, here is a stack captured with FireCapture stacked in Rigistax and played with in PhotoShop. I think it looks good, not great, I still have a lot to learn about solar processing.

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#12 drksky

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Posted 15 November 2012 - 10:00 PM

I think it looks pretty darned good. Remember that you will lose some resolution with the color camera because of the bayer matrix. That's why most people go mono.

But, I'd say that's at least as good as the images that I posted up thread with our DMK51/SMII 90DS. Exposure is dead on showing both surface and limb detail.

#13 Bob Moore

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Posted 16 November 2012 - 11:31 PM

I talked with John Berrman from The Imaging Source today, he said that the DFK has an IR filter in it andthat may be what is causing the issue he is sending me a DBK 41 to try the DBK does not have the IR filter, the IR filter they use is right around 680 + or - 10 nm ... that close to Ha at 656.28, the scope has a + or - 7 nm bandpass. We will see!!!

#14 Fish

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Posted 22 November 2012 - 05:46 PM

Good afternoon,

Tony C's mention of the Bayer matrix is more relevant than you may imagine. H-a is square in the red portion of the spectrum and only 25 percent of the pixels are filtered for red. The 50% of the pixels that are filtered for green and the 25% filtered for blue do not contribute to the image.

A DMK 41 series camera has a 1280 X 960 pixel array; if it's a color version, then only 25 percent of the array or 320 X 240 pixels are capturing the H-a image. Compare this to a DMK 21 series mono camera with a 640 X 480 array: the 21 mono has twice the resolution of the 41 color!

This is why mono cameras are preferred for narrowband imaging. I use a DMK 31 mono for H-a and a 41 mono for CaK and am pleased with the results.

Regards, Marc






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