First RGB with dmk21 - Jupiter + Io + GRS

[Marko of Oz (Mark)]

Finally got to try out the new cam/filter wheel/filters.
Just a quickie before I call it a night.
Reasonable seeing but the ground wind tossed the 10" around a bit.
This was the first run of the night with a 2x barlow. Io is the smudge to the right of it's shadow and the GRS can be seen just coming in on the left limb.
avi's split using virtualdub,
centered and ordered in ninox,
stacked in registax 5 with some wavelets,
and just combined in photoshop.

Io scoots along so fast maybe 40 seconds on each channel is to much?

It's a whole new experience from using a toucam type cam but I happy with the result overall.

cheers

Mark

[iceman (Mike)]

Wow Mark, that's a super image for your first RGB! Excellent work.

When Io or its shadow is transiting, I usually limit the capture to 30s per channel, but even then you'll get some fringing on the shadow or moon.

You can easily make a copy of your image, re-align the channels on the moon/shadow, and selective-copy just that area back over the top of your jupiter image.

[rick01 (Roman)]

It's pretty good result for first attempt. Anyway, Io shadow is little bit shifted (rgb channels are misaligned), but still very good result.

A few days before I also trying my first pics with visual R and B filter (not astronomik). But moving moons like in this case was very problematic for me. Even if I capture only in IR and G channel and Blue channel was synthetic. I more and more think about some color camera for IR + Color composite...

Thanks for this post!


Cheers, Roman

[Quark (Trevor)]

Hi Mark,

Very nice effort for your first attempt with the DMK.
The time that you can get away with will change as you become more proficient at rotating the filter wheel. When I first started using the same equipment often I would manage to shift the image completely off the capture screen while rotating the filter wheel, which obviously makes that particular image set useless.
Experience is a great teacher.

Well done on this effort.
Regards
Trevor

[Lester]

Hi Mark that is a good beginning with the DMK, showing nice detail on Jupiter.

All the best.

[Marko of Oz (Mark)]

Thanks for the comments.

I've processed some more captures and here are the best 2.

A bit over exposed perhaps in the eq region and some elongating of Io in the first one because of the 40 seconds per channel.

The second shot was only 20 seconds per channel and Io is somewhat rounder.

I'd like bigger image scale but the 5x powermate seems to push the 10" way past it's limit. Or the conditions have to be so close to perfect as to make the powermate useless.

cheers

Mark

[Quark (Trevor)]

Originally Posted by Marko of Oz

Thanks for the comments.

I've processed some more captures and here are the best 2.

A bit over exposed perhaps in the eq region and some elongating of Io in the first one because of the 40 seconds per channel.

The second shot was only 20 seconds per channel and Io is somewhat rounder.

I'd like bigger image scale but the 5x powermate seems to push the 10" way past it's limit. Or the conditions have to be so close to perfect as to make the powermate useless.

cheers

Mark

Mark, I think the first image of these two is better. The 5x Powermate with a filter wheel and then your DMK will be delivering 7x. It not only gives you more magnification of the object but also magnifies all of the disturbances in the atmosphere by the same amount. With the 5x Powermate the collimation of your scope is super critical as is the temperature difference between ambient and your primary mirror.

Cheers Trevor

[Doodles23 (Dave Bleser)]

As Mike says you have to work fast to capture Io flying across. Its great to see the images on this board because they represent all the images I can't get. Why? Because it's daytime on this side of the world. I didn't post my Jupiter images from the 23rd of August because they were taken at 98% humidity and I was using a hair dryer after every set of 3 RGB images. Hair Dryers are excellent for causing rapid perturbations in the seeing. As you can see if you take a short enough exposure for each frame wind is not that big of a problem.

[Screwdriverone (Chris)]

Great Effort Mark, I would be extremely pleased with this as a first attempt.

Keep at it, I will watch your progress with interest.

Cheers

Chris

[Paul Haese]

Mark great stuff. Reminds me of my first attempt at RGB. I really like the processing and the colour combination of your image. Well done. Onward to great things I think.