Today's Filament & Plage, Full Disc | HA | Feb 21 2019

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Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MalVeauX » Thu Feb 21, 2019 6:15 pm

Heya,

Woke up to a fairly clear sky with some scattered clouds and some mediocre seeing. The large filament persists and the plage area is bright still. No large prominences and no sunspots currently. First light with a new setup that I've been building. This one centers around a C8 Edge HD SCT telescope with a full aperture Aires tri-band D-ERF for high resolution feature imaging and a masked ST80 for full disc imaging with my Quark Chromosphere and ASI174MM camera with various combinations of focal reducers. Still trying to sort everything out, it's definitely different imaging with it, but managed to get a "first light" with the system to at least show it's functioning.

B&W:

Image

Image

Image

Image

Color:

Image

Image

Image

Image

Earth Scale:
EarthScale_01.jpg
EarthScale_01.jpg (118.32 KiB) Viewed 1356 times
Equipment:

C8 Edge HD SCT equipped with Aires 8" Tri-band D-ERF
Daystar Quark Chromosphere
ST80 (masked to 60mm)
ASI174MM + 0.5x Focal Reducer
SolarSetup_02212019.jpg
SolarSetup_02212019.jpg (45.73 KiB) Viewed 1363 times
C8Edge_DERF_ST80_02212019.jpg
C8Edge_DERF_ST80_02212019.jpg (33.24 KiB) Viewed 1363 times
X10S1125-copy.jpg
X10S1125-copy.jpg (58.74 KiB) Viewed 1363 times
X10S1124-copy.jpg
X10S1124-copy.jpg (51.2 KiB) Viewed 1363 times
focuser_C8Edge.jpg
focuser_C8Edge.jpg (32.99 KiB) Viewed 1363 times
Very best,



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by Astrophil » Thu Feb 21, 2019 7:57 pm

Hey Marty,

Wow! Nice setup. I've been waiting to see it come together. That's a great D-ERF and mounting cell. First light look pretty good and I can't wait to see more from that scope.
Congrats

Phil



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MAURITS » Thu Feb 21, 2019 8:15 pm

Very nice new equipment Marty, wish you a lot of happy moments and beautiful images ...


Regards,
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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by Carbon60 » Thu Feb 21, 2019 8:37 pm

Very nice, Marty.

It’s always so satisfying to get a good first light to prove out the setup.

Stu.


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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by marktownley » Thu Feb 21, 2019 8:59 pm

Looks good Marty!


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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MalVeauX » Thu Feb 21, 2019 9:41 pm

Thanks all,

I still have to figure out this imaging train, it's sub-optimal right now. Transmission is good. I easily do 5ms with zero gain with just the D-ERF and Quark with a 70% histogram still, which is good, with a 0.5x focal reducer. Without the focal reducer, imaging at F42~44 is too large of an imaging scale for my IMX174 pixel size. So F21~F22 with the focal reducer should be near optimal for the IMX174 pixel size. The problem is getting that F21 without big vignetting. In my previous setup, I could do this without much vignetting. But in this setup, placement of the focal reducer results in vignetting that is severe. I have to play around with distance of the focal reducer to the sensor to get it right. I don't mind a little vignetting, but heavy vignetting hurts the FOV when its this narrow, big time.

I will eventually add the 0.7x focal reducer for the Edge series, for night time use. But I may toy around with it for solar too, to widen the FOV on really large subjects (like this filament is so big I cannot frame it up without heavily reducing the EFL without doing a mosaic).

Right now the issue is that the focal reducer is too close to the sensor, I get no vignetting, but the image scale is too large still (it's not 0.5x). But when it's farther from the sensor, the vignetting is quite strong. But, I likely have it too far from the sensor (I think my spacer is 1.5" so 75mm or so?). I'm thinking of getting a 25mm spacer to test out.

Very best,



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by bart1805 » Thu Feb 21, 2019 10:03 pm

Nice! Looking forward to your first try in CaK!



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MalVeauX » Thu Feb 21, 2019 11:01 pm

Working on that next, will likely try it around F20 for the Cak, and then last I will try to get a 430nm filter for white light, but that's low on my list right now since this aperture isn't truly going to show off the iron bits in Gband convection cells (I think 10" is minimum to really start seeing them clearly if I recall?). So for now, I'd be happy with HA and Cak and just standard white light (maybe continuum UV-A) for spots & cells.

But one piece at a time. Everything is just so dang expensive.

Very best,



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by bart1805 » Thu Feb 21, 2019 11:37 pm

F/20 with the pixel size of the 174MM seems a bit on the low side if you want high resolution.



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MalVeauX » Fri Feb 22, 2019 1:53 am

bart1805 wrote:
Thu Feb 21, 2019 11:37 pm
F/20 with the pixel size of the 174MM seems a bit on the low side if you want high resolution.
Agreed, for the pixel size, just depends on seeing. When seeing is questionable, I lower image scale so I walk away with at least something. If seeing allows, sure, would love to image at F28~30!

Very best,



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by eroel » Fri Feb 22, 2019 4:06 am

Marty:
Very nice setup and super first light.
Best wishes,
Eric.



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by Montana » Fri Feb 22, 2019 10:21 am

Very nice images indeed :bow congrats on the kit :hamster:

Alexandra



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MapleRidge » Sat Feb 23, 2019 12:51 am

These first light images form the C8 are very good, and the FD shots from the ST80 are coming out very well :bow

Brian


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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by ffellah » Sat Feb 23, 2019 1:38 am

Great images for a first try, Marty

Franco



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by mattwastell » Sat Feb 23, 2019 6:22 am

Great first out session - looks like you were dodging clouds a fair bit! Happy second light.


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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by marktownley » Sat Feb 23, 2019 8:32 am

Hi Marty,

I bought the dedicated 0.7x Edge HD reducer for my 8" HaT just before the close of last years solar season and was very pleased with the results. My Quark seems to really like f7 as a starting point. I am then able to use my Baader 0.7x solar telecompressor after the quark which gets me around f22 without adverse vignetting on my 174 size sensor.

Agreed this is somewhat undersampling with these large pixels, but when the seeing is not what you'd like it gives more usable imaging sessions.

Mark


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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MapleRidge » Sat Feb 23, 2019 12:54 pm

Hi Mark...

Good to hear the reducer/Quark combo works well for you.

I was wondering how you have the Quark mounted behind the reducer? They have an ideal spacing behind the reducer and I wonder if the camera/Quark is sitting in the 146mm spacing behind the reducer (146mm is the spacing for my C9.25HD)? Since the FOV is relatively small compared to a deep sky setup the effects of not matching the ideal spacing my not be as critical since the camera is only looking in the centre of the field.

Bedsides the spacing I cannot get my Edge to reach focus with the DSII mod at F7 since the filter mount puts the etalon too far back to allow the mirror to focus. I was hoping the F7 would work better than the F10 which produced a very small sweet spot (the DSII is designed for a F7 light cone like the LS80T it was designed for).

Are you using a crayford style focuser or just the built in mirror shift focuser?

Thanks,
Brian


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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MalVeauX » Sat Feb 23, 2019 1:20 pm

marktownley wrote:
Sat Feb 23, 2019 8:32 am
Hi Marty,

I bought the dedicated 0.7x Edge HD reducer for my 8" HaT just before the close of last years solar season and was very pleased with the results. My Quark seems to really like f7 as a starting point. I am then able to use my Baader 0.7x solar telecompressor after the quark which gets me around f22 without adverse vignetting on my 174 size sensor.

Agreed this is somewhat undersampling with these large pixels, but when the seeing is not what you'd like it gives more usable imaging sessions.

Mark
My 0.7x Edge reducer is on the way. I'm going to want it for DSO as well as other applications. So I should be able to test it sometime within a week or so as another option. My Quark was quite happy at F10 and transmission was good. I just had issues with the placement of the focal reducer and vignetting. Too close to the sensor, no vignetting, but appropriately focal reduced and way oversampled. Too far, and it vignetted hard, and seemed more than the appropriate amount of focal reducing producing a tiny scale. I have some spacers coming so I can try different distances to find a happy spot. Or maybe a combination of the Edge reducer and another focal reducer, like you did.

Mind linking to that Baader 0.7x Telecompressor for reference?

Very best,



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by marktownley » Sat Feb 23, 2019 1:26 pm



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Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by MalVeauX » Sat Feb 23, 2019 1:29 pm

Thanks,

Looks like this is the one over here?

https://www.highpointscientific.com/baa ... sor-cmprsr

I'll have to watch for that. I like the idea of it. Don't like the idea of the cost of two reducers (the edge & the baader, sheesh!) :D

Very best,



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Re: Today's Filament & Plage, Full Disc | HA | Feb 21 2019

Post by marktownley » Sat Feb 23, 2019 1:33 pm

Yup, that's the one Marty. I didn't like the idea of 2 reducers either, but it works ;)


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http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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