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My first attempt at M57. I attempted to capture the extended halo by gathering some OIII and Ha data and then blending these into Blue and Red channels, respectively of an LRGB image. The image below represents about 21 hours and was taken with my Esprit 150.
LIGHTS: L:13, R:13,G:8. B: 10 x 600s; Ha:13, OIII:14 x 1800s. DARKS:30, BIAS:100, FLATS:40 all at -20C.
Since a few days, I'm the proud owner of the asi1600 Pro.
Performed some first tests, see: https://youtu.be/hHJBbpNoi2I
I used SGP Pro to test cooling and dark frames (2m and 5m) on unity gain settings.
Is it ok to use unity gain (139) setting or should I use high dynamic range?
Also, this is my first mono. Do I need to take flats/bias frames for each filter separately?
And how could I stack either broadband or narrowband images? I'm used to deep sky stacker.
I am selling my Takahashi Mewlon 108B as I made a serious mistake – I started Electronically Assisted Astronomy and now I am after a flat field refractor. This Mewlon, being the B series, comes with the 7x50 Takahashi illuminated finderscope, factory front cover, factory dovetail and a 2” JMI motorized focuser which works both with or without power (you need to loosen up a tool-less screw to gain manual control).
I purchased this scope from Italy and you can see an actual review of this particular scope here (Google translate is your friend):
The ad from Cloudynights is here:
The scope will be shipped in the original box, properly packed and the original case will be placed in a bigger box, again, properly packed, via courier service, fully insured with tracking. I tested the scope myself and there is no loss of illumination or mirror damage which would warrant a recoating of this scope any time soon. The photos I attach I took when I mounted the scope. For more photos, just see the ad above.
I would be happy to part with it for £ 1,240 including shipping and delivery.
By Victor Boesen
Tonight was the best night out in a long time. The last couple of days the sky has been crystal clear, and today is friday, which meant nothing was on the schedule for tomorrow.
Scope, filters and eyepieces:
Today, I was using my one and only Skywatcher 10" dob, with my collection of explorer scientific 82 degree eyepieces. For the first time in a long time, I also used my CLS filter.
Before I headed out, I decided to have a look at skysafari 5 to see what I should have a look at this clear evening.
Tonights list ended up including:
M13 looked fabulous as always, but I can't quite bag the propeller. I was resolving stars nicely, even a couple in the center, when using averted vision. I think M13 looks the best at 136x and sometimes at 255x, however most of the times I think the image is too dark when observing at 255x.
M92 was a surprise. Locating it was surprisingly easy, as I through the finderscope could just see it as a little faint dot. Looking at it through the scope was amazing. It was not as big as M13, but at 136x it looked very nice, and sometimes, it almost looked like the stars formed a smiley:-) Surprisingly I was also able to resolve a good amount of stars in this cluster, but not as many as in M13.
Now I know this wasn't on the list but I thought I had to give it a go when I saw it on skysafari. NGC6229! Also located in Hercules, and via starhopping also easy to find. This was the smallest one of them all, but the most rewarding since this was my first object from the New General Catalogue (NGC). I was also using 136x at this target, because this is the most comfortable magnification in my opinion. I was only resolving one or two stars in this target, but it was easily visable, just as a bright smudge.
M57 is by far my favorite object (out of the few objects I have seen). The contrast and shape of it gives me the WOW feeling everytime I observe it. Now this target I was observing comfortably at 255x and it looked amazing! Now this was where it popped in the CLS filter which almost made it look like the red outer-part of the nebula was visable, but this faded soon after. While observing this target for about 20min I was thinking if a UHC or a OIII would give me better or the same views?
M27 was kind of disappointing, but I just think I have overestimated how it would look like, but it was still a very nice view it gave me at 136x and 85x. The dumbbell shape became more visable over time, but I think the thing I like more about M57 compared to M27 is the contrast between sky and nebula.
In the end it was one of my best nights I have had with my new (5 months old) scope. I have yet to try it at my grandma and grandpas' where the milky way is visable, and I am very excited to do just that.
By Red Dwarfer
Evening everyone ,
Does anyone know the magnitude of the faint star just outside the Smoke Ring of M57 . Before the clouds rolled in tonight I was trying a new ES 8.8mm in the 200P and M57 looked really well at X 136 magnification , then the thought occurred to try it in the X 2 Barlow which gave a magnification of X 273 and , lo and behold , the Nebula was still clear but this time I could detect a faint star just outside it ( about 1 pm position )
Initially , the reason for trying this high magnification was to try and see the faint centre star but this was not possible tonight ... If I knew the magnitude of the peripheral star compared to the central star , then I`d know if it was possible to see the central star at all ( maybe in darker Winter skies )