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Old 26-02-2006, 11:58 PM
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JoeBlow (Joe)
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First Light review of 12 inch GSO dob from Andrews

Last Tuesday I picked up my new delux 12 inch GS-980 dob from Andrews communications. While I was there I also exchanged the usual 4 plossls for the 15mm 2” 80 degree eyepiece, 9.5mm and 5.2mm EDs, and a Cheshire eyepiece, and paid for the price difference. The 30mm 2” 80 degree eyepiece already came as a bonus with the telescope. But I did have some hassles with getting a proper mount for the telescope, however the problem was solved by the end of the day, anyway this is another story for another day.

The telescope was easily constructed by evening that same day, however they could have provided better instructions for the telescope to clear up some initial confusion about its construction.

Unfortunately I have been plagued with bad weather since receiving the scope (AAAAHHHHHHHH!!!!!! The curse!!!!!!!), but even from the first night I have been taking it outside to observe whatever I could glimpse through gaps in the clouds. So as you read this review of my observations keep in mind that I was observing through much less then ideal conditions. On some nights cloud cover was over 90%!!!! But I was so eager that I would wait patiently for patches of the sky to clear up and usually ended up observing targets through partial cloud cover. Even on nights and times when the sky was much less cloudy it still seemed a bit “dirty” with low clarity, probably due to humidity, and some nights I suffered from a bit of turbulence in the atmosphere. And due to constant movements of clouds overhead I wasn’t able to spend long periods of time observing most targets, and with some I only managed to observe them just for less then 5 minutes.

Anyway, first light was on Sirius which appeared very bright in a backdrop of fainter stars. I actually used this star to help align the finder scope which was done quite easily. I then turned the telescope towards M42 which was just awesome. The first thing I noticed was a distinct bluish tint to the nebula. My best view was through the 15mm at 100x which revealed an abundance of detail in the cloud closely resembling pictures you see in magazines. On another night I also had the chance to have a look at M78 in Orion, I was a bit disappointed in its appearance since all I could see was a very faint glow surrounding several faint stars.

The first Globular cluster I observed was NGC 4833 in Musca, normally I would have chosen a better target to first view but that’s all that was available due to the weather. Anyway this glob was still nicely resolved into faint stars, but I am sure it would appear much better under more ideal conditions and when its higher above the horizon. I also tried to find NGC 4372 another Glob in Musca, but for some reason I was unable to find it despite being of similar magnitude to NGC 4833.

I eventually did get to see Omega Centauri, unfortunately my first view of this great globular was when it was fairly low in the horizon and through partial cloud cover. But even so I was still able to resolve it into hundreds of stars right to its centre with higher magnifications. On latter nights I did get to see this glob under better conditions and it looked marvellous and I believe I may have seen some colour in some of it outer stars. Some other globs I observed include M4, M80, NGC 5286, and NGC 2808. M4 easily resolved into stars but appeared a bit faint due to being very low in the horizon and with the half moon nearby. NGC 2808 easily resolved into stars at 160x and looked great even at 290x having a similar appearance to 47 Tucanae.

The Tarantula nebular was a real treat appearing very bright and showing a wealth of detail. At 100x I observed many arcs of gas in the nebular resembling those in photographs. The whole LMC was filled with numerous bright nots of nebular and other DSOs but I was unable to spend any time studying them due to weather.

Eta Carinae was nice with plenty of bright stars sounded by a large expanse of nebula. However I must admit I was a bit disappointed since I was expecting it to be brighter and more detailed. I remember seeing it looking a bit better even with my 4.5 inch reflector, but this was under better weather conditions and a little darker skies.

In regards to planets I observed Saturn and Jupiter which where very bright and large. Saturn looked awesome at 290x and when the atmosphere would steady it looked just like the pictures in magazines but only smaller. Jupiter was too low in the horison to have a good look, at higher magnifications it looked like a shimmering fireball. But I was still easily able to make out the two major cloud bands and the darkening around its polar regions. There was one night when I was sure I could just make out the red spot as well as hints of other features in its cloud bands, but it was hard to tell due to it shimmering madly. Its four moons appeared as small discs at higher magnifications. Also I personally didn’t find it too much of a hassle tracking the planets at 290x with this dob.

Even now while I am writing this review its pouring down with rain outside and I am still waiting for a good night out observing with my new scope . Lets just hope that the curse is not proportional to the size of the telescope or it will be raining for weeks to come (sorry to you guys in Sydney). But then again this could be a great way for breaking droughts, just get everyone to buy a telescope .

Well thanks for reading everyone.

Clear Skies,

Joe
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  #2  
Old 27-02-2006, 12:03 AM
dhumpie
Planetary neb & glob nut

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Sorry bout that guys. My wife installed a chinese character script on our laptop at home and that must have bugged things up. By the way here is the post plus some add on's

"Great first light report Joe. The week my 10" dob arrived, we had a week of clear and hot weather. Hopefully the weather gods are on leave again....."

Darren

Last edited by dhumpie; 27-02-2006 at 02:00 PM.
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  #3  
Old 27-02-2006, 12:30 AM
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asimov (John)
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Darren, not sure what's going on but instead of letters & words in your reply to this thread all I see are squares!

And nice purchase Joe, enjoy!
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  #4  
Old 27-02-2006, 05:42 AM
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davidpretorius
lots of eyes on you!

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great report, cmon weather gods, give 'im a break
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  #5  
Old 27-02-2006, 10:53 AM
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ving (David)
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hey darren, you using a font not avaliable to our computers or sumpin?

great report sir, seems the 12"er is a hit
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  #6  
Old 27-02-2006, 11:07 AM
man on the moon
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I am getting that dob, and although your conditions aren't ideal, i can see that the telescope is a good choice, i haven't heard anything bad about them yet.
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  #7  
Old 27-02-2006, 02:04 PM
dhumpie
Planetary neb & glob nut

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Hey Joe,

When you get a chance try looking for the red and rusty hues in M42, the Orion Nebula's wings. They will definately be doable in your scope since I have seen those hues in my 10" GS dob. Also check out some of the planetaries and look for internal detail. The Ghost of Jupiter in Hydra is a good one (CBS eye center). The Eskimo Nebula in Gemini is another good one for internal detail

Darren
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  #8  
Old 27-02-2006, 02:17 PM
Nightshift
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Hi joe,

I will be very interested to know how yours stands up to rust, mine is three months old now and rusting quite badly, Lee has offered to paint it but I would have to send it to sydney and back so I have decided not to bother, I will probably do it myself, had I known it was going to do this I would never have bought it, 20/20 hind sight. I have made many modifications to mine now and if you want some hints let me know, it will make it a better scope to use.
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  #9  
Old 27-02-2006, 09:35 PM
Adrian-H
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we need to get these scopes in space and then we'll be happy.
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  #10  
Old 02-03-2006, 03:24 PM
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JoeBlow (Joe)
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12 inch GSO dob update.

I finally got one very clear night to properly test the capabilities of this scope, and it was just awesome considering my mag. 5 light polluted skies.

I began observing at about 11:30 just after the clouds had finally all cleared away and stayed up to 4:30. That night I am sure I observed more DSOs then any other night in my life!

I first had a look at the Sombrero galaxy M104, it was rather bright and I was easily able to make out its bright centre and the dust lane, but its outer glow which is what really gives it its name was very difficult to see. Another galaxy I saw was NGC 5128 which was bright and the dust lane very large and obvious splitting the round galaxy in two.

This night I got to view Eta carina under more ideal conditions and high above the horizon towards zenith. And this time the view blew my little 4.5 incher way out of the water!!! The nebula was very bright, dark lanes clearly visible, filled with hundreds of starts and filling up the entire view through the 2" 30mm 80 degree eye piece!!! A lot of structure was also visible in the brighter parts of the nebula.

I had a good look at two planetary nebulas NGC 2438 in M46 and the Blue planetary NGC 3918. NGC 2438 was very clearly visible even with direct vision, it appeared to me to be about the same size as jupiters disc. I was actually very surprised with how bright it was considering it is listed at mag. 10 and I am viewing under light polluted skies. The Blue planetary was much brighter but smaller and had a very distinct aqua blue colour. It looked a lot like uranus. At higher magnifications it seemed to loose its colour.

I observed many more DSOs that night including many globular clusters which looked fantastic revealing their stars. My favorite eyepiece was the 9.5mm ED yielding 160x which seemed to be an ideal magnification to view many DSOs with this scope. The 2" 80 deg. 30mm and 15mm eyepieces were ideal for viewing large, brighter and more extended DSOs such as M42, omega centauri and eta carina, as well as many open clusters.

Cant wait for more clear skies!!!
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  #11  
Old 02-03-2006, 03:40 PM
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JoeBlow (Joe)
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Quote:
Originally Posted by Nightshift
Hi joe,

I will be very interested to know how yours stands up to rust, mine is three months old now and rusting quite badly,
Has anyone else experienced this problem with similar scopes? Could this be a result of your location and where you store the scope?
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  #12  
Old 02-03-2006, 03:49 PM
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iceman (Mike)
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Nah it's pretty common with the silver coloured GSO tubes.. do a search for "rust" in this Equipment forum and you'll find a few other threads discussing it.
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  #13  
Old 02-03-2006, 03:57 PM
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janoskiss (Steve H)
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Great stuff, Joe! Sounds like the big dobbie is doing its job pulling in those DSOs. Get it out to dark mag 6.5 skies when you get the chance. It will be like doubling the aperture you have there under mag 5 skies. Btw, good spread of magnifications you have there with your upgraded EP set.
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  #14  
Old 04-03-2006, 03:45 PM
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mickoking
Vagabond

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I am another recent GSO 300mm purchaser and I must concur with the reviews of Joe concerning the scope. Last night I observed two planeteries NGC2392 in Gemmini and NGC2438 in Puppis. The Gemmini planetery was very bright and easy despite its low elevation and the Puppis planetery showed considerable detail. I used a 9.7mm Meade s/plossl on both planeteries.

As a telescope it comes HIGHLY RECOMMENDED
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  #15  
Old 04-03-2006, 05:24 PM
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Rastis
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Quote:
exchanged the usual 4 plossls for the 15mm 2” 80 degree eyepiece, 9.5mm and 5.2mm EDs, and a Cheshire eyepiece
Hey Joe,
What do you think of the 5.2mm ED eyepiece? I'm assuming they were the andrews ones.
Rastis.
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  #16  
Old 10-03-2006, 06:53 PM
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JoeBlow (Joe)
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Quote:
Originally Posted by Rastis
Hey Joe,
What do you think of the 5.2mm ED eyepiece? I'm assuming they were the andrews ones.
Rastis.
Well I bought the 5.2mm for high power viewing of the moon and planets, and maybe for a few bright and compact DSOs as well. So far I havent used it much mostly because I am still experiencing bad weather here and I also work 12hr night shift every now and then.

But I have used it on saturn and it gave some very good views. I also tried it on Jupiter another night and found the view was not as good, even with Jupiter high in the sky. I am still yet to properly test this eyepiece.

And yes its from Andrews.
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