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Daystar Camera Quark

Posted: Sun Feb 09, 2020 5:01 am
by DeepSolar64
Everyone,

Has anyone tried the camera quark by Daystar Filters? I am curious on how it would do.

http://www.daystarfilters.com/Quark/CameraQuark.shtml

James

Re: Daystar Camera Quark

Posted: Mon Feb 10, 2020 12:21 am
by MalVeauX
Hi James,

I wouldn't suggest it at all.

It's still just a Quark, same distances for the telecentric and all that. Still need an appropriate focal-ratio regardless of the lens used. So you could just get a Quark, adapt it to EOS mount (should be easy to go from 2" to T2 (M42) to EOS.

The other problem is this implies using a dSLR. I wouldn't get a Quark for use with a dSLR at all. I've done it. It's really not worth it. If you really want a camera on an HA filter pointed at the sun, I would suggest a USB CMOS camera, not a slow, low efficiency dSLR. The Quark's blocking filter is 12mm, so any sensor bigger than that is largely just vignetted and wasted. The dSLR sensor will be insensitive to the wavelength, it will be dim, and slow FPS if you attempt any video photography with it. Also a real bear to focus and hold focus on modern lenses with poor mechanical focus short focus throw mechanisms.

You would actually be way better off with a Takumar M42 (Pentax) based camera lens, it will adapt directly to T2/M48 with a Quark easily, cost nothing (they're dirt cheap on ebay). Plus any camera into the Quark. Long focus mechanism as its a manual lens. Also manual focal-ratio control so you can dial it in to whatever is optimal.

Very best,

Re: Daystar Camera Quark

Posted: Mon Feb 10, 2020 6:22 am
by marktownley
Totally agree with Marty, I wouldn't go near one.

Re: Daystar Camera Quark

Posted: Mon Feb 10, 2020 6:31 am
by DeepSolar64
Thanks guys. I was just curious. I found it odd that they would have one for a conventional DSLR camera when solar imagers pretty much unanimously prefer high frame rate monochrome video cameras and stacking programs.

James

Re: Daystar Camera Quark

Posted: Sun Feb 16, 2020 2:19 pm
by MalVeauX
DeepSolar64 wrote:
Mon Feb 10, 2020 6:31 am
Thanks guys. I was just curious. I found it odd that they would have one for a conventional DSLR camera when solar imagers pretty much unanimously prefer high frame rate monochrome video cameras and stacking programs.

James
Hi James,

I put a dSLR on my Quark a few years ago and tried to image with it. It was terrible. Very dim, the sensor was not very sensitive to 656nm and it took a lot of ISO just to see something. The worst part was focusing because the FPS was slow on the dSLR in video and so with variable seeing conditions and a dim image it was annoying to even try to focus.

Granted, this was about 3 years ago and I probably could do it a little better today, but honestly it's really a weak setup compared to even a color USB CMOS video camera is. After the dSLR I used an ASI178MC (color!) and it was night & day difference, the speed was much faster, so much easier to operate, easier to focus, etc, way more sensitive to the wavelength than dSLR. The dSLR I was using was a Canon T4i so it was not ancient, but still, I just can't recommend any dSLR/mSLR at this point. Today's modern dSLR/mSLR with 4K video might have better video performance, but its still going to be low sensitivity and slow FPS compared to a much cheaper CMOS USB camera.

So again, not just drinking the koolaid on camera suggestions, I did it and it was bad:

Image

Image

Image

Very best,

Re: Daystar Camera Quark

Posted: Sun Feb 16, 2020 8:00 pm
by DeepSolar64
Marty,
Certainly not close to the USB CMOS camera but it did a little better than I expected. The prom on the first one shows up ok it just lacks the sharpness of the USB camera and stacking method. Also this in natural Ha red. Most people post process their monochrome images in yellow or orange. It there a particular reason why people do not try to restore the natural Ha red color to the images? Of is red less esthetic?

James

Re: Daystar Camera Quark

Posted: Sun Feb 16, 2020 8:59 pm
by MalVeauX
DeepSolar64 wrote:
Sun Feb 16, 2020 8:00 pm
Marty,
Certainly not close to the USB CMOS camera but it did a little better than I expected. The prom on the first one shows up ok it just lacks the sharpness of the USB camera and stacking method. Also this in natural Ha red. Most people post process their monochrome images in yellow or orange. It there a particular reason why people do not try to restore the natural Ha red color to the images? Of is red less esthetic?

James
Hi James,

Unsure really, likely has to do with contrast. Some do color their images red. Some do pink. Some do orange. Some do yellow. It's all a personal choice. Then you have to consider that 1 out of 12 males are color blinds to red & green, so that probably plays a role too. Never know!

Very best,

Re: Daystar Camera Quark

Posted: Tue Feb 18, 2020 5:01 pm
by DeepSolar64
Marty,

So true. I never thought of that, My stepson has red-green color blindness!

James