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Old 10-09-2012, 04:56 AM
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dtrewren (Dave)
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QHY10 first light images from topside (UK)

Hello fellow imagers,

Greetings from the dark & damp UK

I bought myself a QHY10 a couple of months ago and it had it's first light last
week - UK weather finally gave up being horrible for a couple of days.

So I decided on M27 & M13 as my two first targets mainly because they are like
chalk and cheese and it would be a good test for the camera (and me). All the
subs for both targets were 600s (10mins) and both images used bias & flat frames
but no darks. More details on each image can be found by clicking the link under
the image.

M13 : http://www.dt-space.co.uk/AstroImages/M13.html

M27 : http://www.dt-space.co.uk/AstroImages/M27.html

I was very pleased with the camera performance compared to my QHY9M+FW. I think
with my current level of processing skills the results are about the same.

Comments always 'very' welcome.

Cheers & clear skies,

Dave
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Click for full-size image (M13_ice.jpg)
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Old 10-09-2012, 05:49 AM
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silv (Annette)
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Wow, Dave, the Dumbbell got out beautifully! You must be very pleased with it. I like it a lot.
I checked out your other images, too.
The veil nebula is a stunner for me.

Have fun!
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Old 10-09-2012, 05:57 AM
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dtrewren (Dave)
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Hi Silv,

Fantastic, thanks for the positive feedback much appreciated. So far I have been presently surprised and pleased with the new camera output & I really enjoyed processing the dumbbell.

Roll on some more clear nights, our imaging season is just starting

Clear skies,

Dave
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Old 10-09-2012, 06:11 AM
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peter_4059 (Peter)
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I like the M27 Dave. Nicely done.
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Old 10-09-2012, 06:20 AM
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dtrewren (Dave)
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Cheers Peter,

I'm kinda hoping the new OSC will allow for better utilization of what clear nights we get up here and the the mono+FW for narrowband.

Where does M27 sit in the sky for you guys ?

Dave
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Old 10-09-2012, 06:35 AM
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While your processing skills are delightful on every image in your collection, the change of gear and the results are very interesting to follow for me as a newbie.
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Old 10-09-2012, 06:44 AM
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Quote:
Where does M27 sit in the sky for you guys ?
at 9pm, 29* above the northern horizon and setting, Stellarium says.
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Old 10-09-2012, 06:55 AM
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dtrewren (Dave)
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It's 9.50pm here and I have M27 at ~22 in the South just about to pass through the meridian heading West.

Thank you Silv

I have tried not to change too much, main motivation for change had been to maximise imaging in the poor UK weather and try and beat the light pollution associated with having 400k+ people living just behind me - all of whom seem to have security lights on ...... I might buy me an air rifle !

I think I have settled on refractors just because of ease of use, portability and relative immunity to temperature variation. Camera wise I went down the Mono+FW route and narrowband to try and combat the LP. Trouble is the sky here is so unpredictable that I was finding most nights ended in an incomplete set of subs therefore requiring a further night to get the rest. So I bought the QHY10 OSC to see how it performed under the orange fog from Bristol. I have to say with an IDAS LP2 filter fitted it has performed way beyond my expectations and I'm very relieved as it could have proved an expensive mistake !

Do you have some images yet ?

Clear skies,

Dave
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Old 10-09-2012, 07:31 AM
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Quote:
all of whom seem to have security lights on ...... I might buy me an air rifle !

your rifle would lead to more security lights around Bristol, I suppose?

Ah, so good to understand your way in gear development and finally combating LP . Thank you.

I made the typical mistake:
decision was made for HEQ5Pro and initial wide field without telescope until wallet recovery. Good plan, aye.
But then, a 2nd hand EQ5 Goto with 8" F5 newt pops up for half the HEQ5 $$ and I jumped onto that.
Steep learning curve followed. Heaps of fun and some piggyback wide fields.
Going prime focal shortly before the wet season kicked in in Auckland revealed the mount's weakness: it simply can't cope with 9kg and tracking is horrible: ~8seconds at the most. 3 seconds when aiming at the zenith. ... but I loved loved loved the process and results, none the less! I guess, I'm really hooked.
Taking mount apart to look for reasons ... being a semi-professional idiot when it comes to tools and stuff.. leads to splintering a 2cmx2mm piece off the RA head. It still works, though, and the rip won't get worse. I even got it to track less bumpy by removing paint chips or something. yay!
But now I'm stuck with the EQ5 and can't sell it on, anymore.
So right now, I have to get a lighter scope and am in the process of selling on the 8" and new focuser.
[Seriously thinking of a 6" F4 from Teleskop-express.de - seems to be lightweight enough with ~6kg all together and not too small an aperture, either. A likely DIY project, though, from what I've read on the web. Bring it on! ]

Typical mistake, aye. Lesson learned - and so much more.

No time wasted, though, as it has been raining constantly for 2 months and still is. One wonders where the sun is doing all the evaporation that comes pouring down, all the time. Certainly not in these parts of the world.

Clear skies
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Old 10-09-2012, 08:02 AM
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dtrewren (Dave)
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Good thinking, hadn't considered some headcase walking around taking out security lights might breed more

I wouldn't worry about making mistakes the only thing that suffers is the bank balance - I have a box full of mistakes !

Mmmm, this would be my advice. I don't think it's going to do you any favours downgrading your optics to suit a mount that won't handle the weight and is not tracking well. The mount is the key to getting anything reasonable from the rest of the kit. I bought a HEQ5 and am very happy with it, it tracks with an RMS error of around 0.25pixels and I get good results. Ok, it's a sub £1000 mount so is not perfect and does require a little TLC once a season and some fresh lithium grease but it works well and is nice and portable.

My advice would be wait until you have the cash to replace the mount. Get what you can for the EQ5 and then decide on how much payload you are likely to want. If your payload is around 6-10kg an HEQ5 is fine, if it's 10-15kg then an EQ6 ..... if more then it's going to get much more expensive. Also mounts like the HEQ5 come up second hand quite a bit because guys buy on a budget get hooked and then want a big scope so have to upgrade.

Ask around but I think most people will advise mount first, optics & next. Also I would say don't load your mount to more than 2/3 of it's maximum capacity. Some say not more than 1/2 capacity but that may be a little cautious.

I have attached a tracking report from my HEQ5 taken from the night I did M27. The RMS error is <0.5 pixel which I think is fine - depends on how good your seeing is, generally poor here.

Clear skies,

Dave
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  #11  
Old 10-09-2012, 08:49 AM
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Awe, thank you for your advice!!
I'll take it into consideration... the suspicion of perpetuating the first mistake did already knock shyly at the back of my skull... now louder, so.

Your Dumbbell nebula is wonderful!

What do you personally think of your star cluster?
There probably isn't anything regarding processing you can do to improve the core detail?
If I ever get a real chance for Omega Centauri, I thought of reducing the star detection in DSS. Might be a dumb thought - DSS possibly doesn't detect any single stars in the core, anyway, but only a big "light bulb".
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Old 10-09-2012, 11:08 AM
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David
Almost missed these images. Really nice and Im glad you like the QHY10 and are getting great results.
Allan
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